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Green synthesis of calcium oxide nanocatalyst and application in transesterification of waste cooking oil 认领 引用
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作者 Rajni Garg Rishav Garg +3 位作者 Nnabuk Okon Eddy Mukhtar Iderawumi Abdulraheem Oluwadamilola Oluwatoyin Hazzan Gholaremza Abdi 《Bioresources and Bioprocessing》 SCIE EI CSCD 2025年第1期851-864,共14页
This study aims to synthesize calcium oxide nanoparticles by employing green synthetic methods and explore their potential as nano-catalyst based upon the utilization of waste into a value-based product.Waste orange p... This study aims to synthesize calcium oxide nanoparticles by employing green synthetic methods and explore their potential as nano-catalyst based upon the utilization of waste into a value-based product.Waste orange peel extract has been utilized as a reducing medium.The reaction was optimized by varying the reactants’molar ratio to obtain calcium carbonate microparticles that were calcined to obtain calcium oxide nanoparticles with a particle size ranging from 70 to 100 nm.Various spectrochemical techniques analyzed the composition and morphology of the nano-catalyst.The nano-catalyst was further exploited in the one-pot transesterification of waste cooking oil.The biodiesel was analyzed for the presence of methyl ester groups by FTIR and GCMS analysis.The impact of varying reaction constraints,including temperature,contact time,nano-catalyst concentration,and methanol-oil molar ratio,were critically analyzed to optimize biodiesel yield.The study provided an economical and environmentally benign technique to successfully synthesize calcium oxide nano-catalyst to obtain biodiesel with 93.4%yield and effective waste minimization. 展开更多
关键词 Green synthesis Nano-catalyst Waste cooking oil Transesterification Biodiesel
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Solid base catalysts derived from Ca-M-Al(M = Mg, La, Ce, Y) layered double hydroxides for dimethyl carbonate synthesis by transesterification of methanol with propylene carbonate 认领 引用 被引量：15
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作者 Yunhui Liao Feng Li +2 位作者 Xin Dai Ning Zhao Fukui Xiao 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第11期1860-1869,共10页
Composite solid base catalysts derived from Ca‐M‐Al(M=Mg,La,Ce,Y)layered double hydroxides(LDH)were synthesized,characterized and applied to the transesterification of methanol with propylene carbonate.X‐ray diffra... Composite solid base catalysts derived from Ca‐M‐Al(M=Mg,La,Ce,Y)layered double hydroxides(LDH)were synthesized,characterized and applied to the transesterification of methanol with propylene carbonate.X‐ray diffraction analyses of the catalysts show that all of the catalysts were in the form of composite oxides.Compared with the Ca‐Al LDH catalyst,the specific surface areas and pore volumes of the catalysts were increased with the introduction of Mg,La or Ce.The catalytic performance of these catalysts increases in the order of Ca‐Y‐Al<Ca‐Al<Ca‐Ce‐Al<Ca‐La‐Al<Ca‐Mg‐Al,which is consistent with the total surface basic amounts of these materials and the formation of especially strong basic sites following modification with Mg and La.The Ca‐Mg‐Al catalyst shows the highest(Ca+Mg):Al atomic ratio,indicating that it likely contains more unsaturated O2?ions,providing it with the highest concentration of very strong basic sites.The recyclability of these catalysts is improved following the addition of Mg,La,Ce or Y,with the Ca‐Mg‐Al maintaining a high level of activity after ten recycling trials.X‐ray diffraction analyses of fresh and used Ca‐Mg‐Al demonstrate that this catalyst is exceptionally stable,which could be of value in practical applications related to heterogeneous catalysis. 展开更多
关键词 Ca‐M‐Al layered double hydroxide Solid base Transesterification Dimethyl carbonate
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Activity and basic properties of KOH/mordenite for transesterification of palm oil 认领 引用 被引量：11
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作者 Pisitpong Intarapong Sotsanan Iangthanarat +2 位作者 Pitchaya Phanthong Apanee Luengnaruemitchai Samai Jai-In 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2013年第5期690-700,共11页
The catalytic performance of KOH/mordenite has been studied for transesterification of palm oil using a batch reactor and a packed-bed reactor at 60 C and atmospheric pressure.The KOH/mordenite processed transesterifi... The catalytic performance of KOH/mordenite has been studied for transesterification of palm oil using a batch reactor and a packed-bed reactor at 60 C and atmospheric pressure.The KOH/mordenite processed transesterification in the batch reactor gave the highest methyl ester yield of96.7%under optimum conditions,while a methyl ester content over 94.5%was obtained in the packed-bed reactor.This comparison indicates that transesterification in a batch-type reactor gives a higher methyl ester yield than that of a continuous-flow reactor.Dealumination was found in the calcined catalysts and had a significant effect on the physical structure and chemical composition of the catalysts.Leaching of the potassium species was negligible,whereas depositing and washing of the reacted mixture with acetone on the catalyst surface were observed by FTIR. 展开更多
关键词 transesterification biodiesel mordenite KOH solid base catalyst
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Zirconium-containing UiO-66 as an efficient and reusable catalyst for transesterification of triglyceride with methanol 认领 引用 被引量：14
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作者 Fan Zhou Ningyue Lu +2 位作者 Binbin Fan Huigang Wang Ruifeng Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2016年第5期874-879,共6页
Zirconium-based MOFs of the UiO family have attracted considerable attention due to their high thermal,chemical and mechanical stability. With the aim of further exploring the applications of zirconium-based UiO-66 in... Zirconium-based MOFs of the UiO family have attracted considerable attention due to their high thermal,chemical and mechanical stability. With the aim of further exploring the applications of zirconium-based UiO-66 in acid-catalyzed reactions and elucidating the effects of the defects in UiO-66 materials on their catalytic performances, in this work, a series of zirconium-containing UiO-66 samples were synthesized by varying the synthesis temperatures and BDC/Zr(terephthalic acid/ZrCl) ratios in the synthesis system.The synthesized UiO-66 samples were characterized by X-ray diffraction(XRD), Nadsorption-desorption,scanning electron microscopy(SEM), thermogravimetrical analysis(TGA), temperature-programmed desorption of NH(NH-TPD). Their catalytic performances were investigated in transesterification of tributyrin and soybean oil with methanol. The results showed that UiO-66 samples with different amounts of defects could be successfully prepared by varying the synthesis temperatures and/or the BDC/Zr ratios used in the synthesis system. The catalytic activities of the UiO-66 materials greatly depended on their linker defects and enhanced with the increase of the defect amount. The UiO-66 was an efficient catalyst for transesterification of tributyrin and soybean oil with methanol under mild reaction conditions and its catalytic activity was comparable to other solid acid catalysts reported in the literatures. The UiO-66 catalyst was relatively stable and could be reused. 展开更多
关键词 Metal organic frameworks Solid acid Transesterification UiO-66 Catalyst
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Biodiesel preparation from transesterification of glycerol trioleate catalyzed by basic ionic liquids 认领 引用 被引量：8
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作者 Shuai Zhou Lu Liu +2 位作者 Bo Wang Feng Xu Run Cang Sun 《Chinese Chemical Letters》 SCIE CAS CSCD 2012年第4期379-382,共4页
In the present study,the transesterification of glycerol trioleate was carried out over a basic ionic liquid,1-butyl-3-methylimidazolium hydroxide([Bmim]OH)and an 87.2%yield of methyl ester was achieved.The product wa... In the present study,the transesterification of glycerol trioleate was carried out over a basic ionic liquid,1-butyl-3-methylimidazolium hydroxide([Bmim]OH)and an 87.2%yield of methyl ester was achieved.The product was isolated through simple decantation from the biphasic system due to the immiscibility of[Bmim]OH with ester.[Bmim]OH can be easily recovered and reused six times without dramatic decrease in ester yield. 展开更多
关键词 Biodiesel Basic ionic liquids Glycerol trioleate Transesterification Low-cost feedstocks
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Structure-Activity Correlations of Calcined Mg-Al Hydrocalcites for Aliphatic Polycarbonate Synthesis via Transesterification Process 认领 引用 被引量：5
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作者 Zi-qing Wang Yuan-sheng Bai +3 位作者 Wei Jiang Xian-gui Yang Shao-ying Liu Gong-ying Wang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2017年第1期130-140,共11页
Mg-A1 mixed oxides with different Mg/A1 molar ratio were prepared by thermal decomposition of hydrotalcite-like precursors at 500℃for 5.0 h and used as catalysts for the transesterification of diphenyl carbonate with... Mg-A1 mixed oxides with different Mg/A1 molar ratio were prepared by thermal decomposition of hydrotalcite-like precursors at 500℃for 5.0 h and used as catalysts for the transesterification of diphenyl carbonate with 1,4-butanediol to synthesize high-molecular-weight poly(butylene carbonate)(PBC).The structure-activity correlations of these catalysts in this transesterification process were discussed by means of various characterization techniques.It was found that the chain growth for the formation of PBC can only be obtained through connecting-OH and-OC(C)OC6H5 end-group upon removing the generated phenol,and the sample with Mg/A1 molar ratio of 4.0 exhibited the best catalytic performance,giving PBC with Mw of 1.64×105 g/mol at 210℃for 3.0 h.This excellent activity depended mainly on the specific surface area and basicity rather than pore structure or crystallite size of MgO. 展开更多
关键词 Mg-A1 hydrotalcite Poly(butylene carbonate) Diphenyl carbonate Transesterification Basic sites
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Optimization of safflower oil transesterification using the Taguchi approach 认领 引用 被引量：4
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作者 N.Kumar S.K.Mohapatra +2 位作者 S.S.Ragit K.Kundu R.Karmakar 《Petroleum Science》 SCIE CAS CSCD 2017年第4期798-805,共8页
Biodiesel is an alternative renewable fuel which is produced by using biomass resources. Its physicochemical properties are close to those of the petroleum diesel fuel. This study highlights biodiesel production from ... Biodiesel is an alternative renewable fuel which is produced by using biomass resources. Its physicochemical properties are close to those of the petroleum diesel fuel. This study highlights biodiesel production from safflower seed oil. The main aim of this experimental work is to optimize the process parameters, namely the methanolto-oil molar ratio, catalyst concentration, reaction time and reaction temperature for biodiesel production. The Taguchi robust design approach was used with an L9 orthogonal array to analyze the influence of process factors on performance parameters. The results showed that the optimum yield of biodiesel was 93.8% with viscosity 5.60 c St, with a methanol-to-oil molar ratio of 4:1, catalyst concentration of 1.5 wt%, reaction time of 90 min and reaction temperature of 60 ℃. The catalyst concentration was found to be the most influencing parameter which contributed 51.1% and 50.8% of the total effect on the yield of biodiesel, Y;, and viscosity of biodiesel, Y;, respectively. 展开更多
关键词 ANOVA Biodiesel Optimization Taguchi approach Transesterification
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Transesterification of palm oil to biodiesel using Brφnsted acidic ionic liquid as high-efficient and eco-friendly catalyst 认领 引用 被引量：5
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作者 Yaoyao Feng Ting Qiu +3 位作者 Jinbei Yang Ling Li Xiaoda Wang Hongxing Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第9期1222-1229,共8页
The transesterification of palm oil and methanol catalyzed by Br?nsted acidic ionic liquids was investigated. Four eco-friendly Br?nsted acidic ionic liquids were prepared and their structures were characterized by NM... The transesterification of palm oil and methanol catalyzed by Br?nsted acidic ionic liquids was investigated. Four eco-friendly Br?nsted acidic ionic liquids were prepared and their structures were characterized by NMR, FT-IR and TG–DTG. The results demonstrated that [CyN1,1PrSO_3H][p-TSA] was more efficient than the other ionic liquids and chosen as catalyst for further research. The influences of various reaction parameters on the conversion of palm oil to biodiesel were performed, and the orthogonal test was investigated to seek the optimum reaction conditions, which were illustrated as follows: methanol to oil mole ratio of 24:1, catalyst dosage of 3.0 wt% of oil, reaction temperature of 120 °C, reaction time of 150 min, and the biodiesel yield achieved 98.4%. In addition, kinetic study was established for the conversion process, with activation energy and preexponential factor of 122.93 k J·mol-1 and 1.83 × 1015, respectively. Meanwhile, seven-time recycling runs of ionic liquid were completed with ignorable loss of its catalyst activity. The refined biodiesel met the biodiesel standard EN 14214. 展开更多
关键词 Brφnsted acidic ionic liquid Biodiesel Palm oil Transesterification Kinetic Optimization
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Dimethyl carbonate synthesis via transesterification catalyzed by quaternary ammonium salt functionalized chitosan 认领 引用 被引量：4
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作者 Yuan Zhao Liang Nian He +1 位作者 Yuan Yi Zhuang Jin Quan Wang 《Chinese Chemical Letters》 SCIE CAS 2008年第3期286-290,共5页
A quaternary ammonium salt covalently linked to chitosan was first used as a catalyst for dimethyl carbonate （DMC） synthesis by the transesterification of propylene carbonate （PC） with methanol. The effects of var... A quaternary ammonium salt covalently linked to chitosan was first used as a catalyst for dimethyl carbonate （DMC） synthesis by the transesterification of propylene carbonate （PC） with methanol. The effects of various reaction variables like reaction time, temperature and pressure on the catalytic performance were also investigated. 54% DMC yield and 71% PC conversion were obtained under the optimal reaction conditions. Notably, the catalyst was able to be reused with retention of high catalytic activity and selectivity. Consequently, the process presented here has great potential for industrial application due to its advantages such as stability, easy preparation from renewable biopolymer, and simple separation from products. 展开更多
关键词 Chitosan Quaternary ammonium salt Transesterification Dimethyl carbonate
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Transesterification of sunflower oil in microchannels with circular obstructions 认领 引用 被引量：3
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作者 Harrson S.Santana Joao L.Silva Jr +1 位作者 Deborah S.Tortola Osvaldir P.Taranto 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第4期852-863,共12页
The present paper studied numerical and experimentally the transesterification reaction between sunflower oil and ethanol with NaO H catalyst in microchannels with circular obstructions. The micromixer design influenc... The present paper studied numerical and experimentally the transesterification reaction between sunflower oil and ethanol with NaO H catalyst in microchannels with circular obstructions. The micromixer design influence on fluid mixing and oil conversion was investigated for a range of operating conditions: Reynolds number(Re = 0.1–100),Temperature(25–75 °C), ethanol/oil molar ratio(6-12), and catalyst concentration(0.75 wt%–1.25 wt%), using three microchannel configurations(Length = 35 mm; Width = 1500 μm; Height = 200 μm): T-shape – channel without obstructions; MCO – channel with 3 obstructions ensemble – equally disposed over longitudinal length;MWO – channel with 7 obstructions ensemble. The MCO micromixer was based on literature work, and the MWO is a totally new micromixer design. Experimental tests were conducted in similar conditions in microreactors using these micromixers(Length = 411 mm) made of polydimethylsiloxane. The MCO configuration presented the highest performance(mixing index of 0.80 at Re = 100), oil conversion of 81.13% at 75 °C, molar ratio of 9 and catalyst concentration of 1%. Experimental results showed high conversions for MCO and MWO configurations(99.99%) at 50 °C, molar ratio of 9 and catalyst concentration of 1%, with a residence time of 12 s. 展开更多
关键词 Biodiesel Sunflower oil-ethanol Transesterification reaction Circular obstructions Microreactor Numerical simulation
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Molybdosphoric Acid Mixed with Titania Used as a Catalyst to Synthesize Diphenyl Carbonate via Transesterification of Dimethyl Carbonate and Phenol 认领 引用 被引量：8
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作者 Tong Chen Huajun Han +5 位作者 Zhiping Du Jie Yao Gongying Wang Dachuan Shi Desheng Zhang Zhiming Chen 《Journal of Natural Gas Chemistry》 2006年第4期303-306,共4页
The 12-molybdosphoric acid mixed with titania （MPA-TiO2） was found to be a novel and efficient catalyst for the synthesis of diphenyl carbonate （DPC） via transesterification of dimethyl carbonate （DMC） and pheno... The 12-molybdosphoric acid mixed with titania （MPA-TiO2） was found to be a novel and efficient catalyst for the synthesis of diphenyl carbonate （DPC） via transesterification of dimethyl carbonate （DMC） and phenol. The X-ray diffraction （XRD） and infrared （IR） techniques were employed to characterize the prepared catalysts. The effect of the weight ratio of the 12-molybdosphoric acid to titania on the transesterification was investigated. A 13.1% yield of DPC and an 11.6% yield of methyl phenyl carbonate （MPC） were obtained over MPA-TiO2 with the weight ratio of MPA to TiO2 as 5：1. 展开更多
关键词 transesterification 12-molybdosphate acid titania methyl phenyl carbonate diphenyl carbonate
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N-Heterocyclic carbene-catalyzed synthesis of acetyltributylcitrate via a transesterification reaction 认领 引用 被引量：2
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作者 Lin He Hao Guo +4 位作者 Xiao-Wei Ma Jie Zhang Cheng-Zhi Gu Wei Wang Bin Dai 《Chinese Chemical Letters》 SCIE CAS CSCD 2014年第2期215-217,共3页
A new methodology for the synthesis of a green plasticizer acetyltributylcitrate through a transesterification reaction was developed. Under the catalysis of alkyl-substituted imidazol-type N-heterocyclic carbenes, tr... A new methodology for the synthesis of a green plasticizer acetyltributylcitrate through a transesterification reaction was developed. Under the catalysis of alkyl-substituted imidazol-type N-heterocyclic carbenes, tributyl citrate can react with vinyl acetate smoothly to give ATBC in high yield. 展开更多
关键词 Acetyltributylcitrate N-Heterocyclic carbenes Transesterification reaction Tributyl citrate Vinyl acetate
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Efficient transesterification over two-dimensional zeolites for sustainable biodiesel production 认领 引用 被引量：2
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作者 Hao Pang Guoju Yang +1 位作者 Lin Li Jihong Yu 《Green Energy & Environment》 SCIE EI CAS CSCD 2020年第4期405-413,共9页
Basic zeolites have shown great potential as efficient catalysts for biodiesel production in the transesterification reactions.However,conventional three-dimensional(3D)basic zeolites generally suffer from limited bas... Basic zeolites have shown great potential as efficient catalysts for biodiesel production in the transesterification reactions.However,conventional three-dimensional(3D)basic zeolites generally suffer from limited base sites and severe mass-transfer restriction,thereby suppressing their catalytic activity.Herein,2D basic zeolites with large external surface areas,hierarchical characteristics,and abundant accessible and stable base sites are prepared by expansion,delamination and subsequent solid-state ion-exchange(SSIE)approach.The facile SSIE method provides more advantages in stabilizing and dispersing high concentration of strong basic sites than the conventional liquid-phase ion-exchange(LIE)approach.Due to the excellent mass transportation and stable basic sites,the 2D Na/ITQ-2 prepared by the SSIE approach shows remarkably enhanced activity and recyclability in the transesterification of triglycerides to produce biodiesel,compared to 3D zeolites and other reported basic zeolites.This work will open the boulevard to the rational design of 2D basic catalysts and expand the potential application of 2D zeolites to biodiesel production and other industrial reactions involving bulky molecules. 展开更多
关键词 Biodiesel Zeolites Two-dimensional Transesterification Solid-state ion-exchange
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Preparation of Diphenyl Oxalate from Transesterification of Dimethyl Oxalate with Phenol over TS-1 Catalyst 认领 引用 被引量：2
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作者 Xin Bin MA Sheng Ping WANG +1 位作者 Hong Li GUO Gen Hui XU 《Chinese Chemical Letters》 SCIE CAS 2003年第5期461-464,共4页
Diphenyl oxalate was synthesized from transesterification of dimethyl oxalate with phenol over TS-1 ( 2.5 wt% Ti ) catalyst. TS-1 catalyst, as a heterogeneous catalyst, showed excellent selectivity of diphenyl oxalate... Diphenyl oxalate was synthesized from transesterification of dimethyl oxalate with phenol over TS-1 ( 2.5 wt% Ti ) catalyst. TS-1 catalyst, as a heterogeneous catalyst, showed excellent selectivity of diphenyl oxalate and methylphenyl oxalate compared with other homogeneous catalysts. Lewis acid sites on TS-1 catalyst were the active sites for transesterification of dimethyl oxalate with phenol. The high selectivity was closely related to the weak acid sites over TS-1. 展开更多
关键词 Diphenyl oxalate transesterification dimethyl oxalate weak acid sites TS-1.
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Reactive Flash Simulation of the Continuous Melt Transesterification Process of Polycarbonate 认领 引用 被引量：2
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作者 秦吉臣 谢小莉 +1 位作者 曹贤武 瞿金平 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2007年第1期51-62,共12页
A model of the continuous melt transesterification process of bisphenol-A and diphenyl carbonate in a continuous stirred tank reactor to produce polycarbonate is presented. The model is developed by using the molecula... A model of the continuous melt transesterification process of bisphenol-A and diphenyl carbonate in a continuous stirred tank reactor to produce polycarbonate is presented. The model is developed by using the molecular species model of polycarbonate melt polycondensation and the modeling method of reactive flash. Liquid phase is treated as perfect mixed flow and the vapor phase is assumed following the ideal gas law. With this model, the continuous melt transesterification process of bisphenol-A and diphenyl carbonate is examined with respect to different orocess parameters. 展开更多
关键词 rcontinuous melt transesterification polycarbonate simulation continuous stirred tank reactor
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Synthesis of Mg_5(CO_3)_4(OH)_2·4H_2O with Flower-like Micro-structure and Its Catalytic Activity for Transesterification of Dimethyl Carbonate with Phenol 认领 引用 被引量：2
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作者 WANG Qiang WANG Ke-li +2 位作者 WU Xing-long LUO Sheng-jun HU Chang-wen 《Chemical Research in Chinese Universities》 SCIE CAS 2007年第6期641-645,共5页
A novel flower-like hydrated magnesium carbonate hydroxide, Mg5 （CO3 ）4 （OH）2·4H2O, with micro-structure composed of individual thin nano-sheets was synthesized using a facile solution route without the use o... A novel flower-like hydrated magnesium carbonate hydroxide, Mg5 （CO3 ）4 （OH）2·4H2O, with micro-structure composed of individual thin nano-sheets was synthesized using a facile solution route without the use of template or organic surfactant. Reaction time has an important effect on the final morphology of the product. The micro-structure and morphology of Mg5 （CO3）4 （OH）2·4H2O were characterized by means of X-ray diffractometry （XRD）, fieldemission scanning electron microscopy（FE-SEM）. Brunauer-Emmett-Teller（BET） surface areas of the samples were also measured. The probable formation mechanism of flower-like micro-structure was discussed. It was found that Mg5 （CO3）4（ OH）2·4H2O with flower-like micro-structure was a novel and efficient catalyst for the synthesis of diphenyl carbonate （DPC） by transesterification of dimethyl carbonate （DMC） with phenol. 展开更多
关键词 Mg5（CO3）4（OH）2 ·4H2O Flower-like micro-structure Catalytic property Transesterification Diphenyl carbonate
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Molecular Simulation of Transesterification of Ethylene Carbonate and Methanol Catalyzed by Ionic Liquids 认领 引用 被引量：2
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作者 Guo Liying Wu Hao +2 位作者 Wang Yirong Cui Zhongyi Chen Yanming 《China Petroleum Processing & Petrochemical Technology》 CAS 2019年第4期73-80,共8页
Four ionic liquids [BMIM]OH, [BMIM]IM, [BMIM]Br, and [BMIM]PF6 were synthesized and characterized by infrared spectroscopy. Then the effects of ionic liquids(ILs), cocatalysts, and reaction temperature on the catalyti... Four ionic liquids [BMIM]OH, [BMIM]IM, [BMIM]Br, and [BMIM]PF6 were synthesized and characterized by infrared spectroscopy. Then the effects of ionic liquids(ILs), cocatalysts, and reaction temperature on the catalytic performance for transesterification of ethylene carbonate and methanol were investigated with orthogonal experiments. The influence of cations and anions of ILs on catalytic activity was revealed by the density functional theory(DFT). The reaction mechanism was proposed based on the experimental results and DFT. The results demonstrated that the optimal catalyst was [Bmim]PF6/CaO, which exhibited the advantages of high activity, excellent stability, and easy recycling. Under the optimized conditions covering a catalytic temperature of 130 °C, an ionic liquid/cocatalyst mass ratio of 5:1, and a catalyst dosage of 4.0%, the conversion rate could reach 65.23% with a dimethyl carbonate selectivity of 98.95%. No significant loss of catalyst activity was detected after 7 recycle times. 展开更多
关键词 ionic liquids catalyst transesterification molecular simulation
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A highly active and stable organic-inorganic combined solid acid for the transesterification of glycerol under mild conditions 认领 引用 被引量：1
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作者 Yuanyuan Jiang Ruru Zhou +4 位作者 Huaiyuan Zhao Boyong Ye Yihua Long Zhengbao Wang Zhaoyin Hou 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第10期1772-1781,共10页
Solid acid catalyst plays a crucial role in the petroleum refinery industry and bio-refinery technology.In this work,p-phenolsulfonic acid(PSA)was successfully grafted onto the surface of KH560-modified zirconium phos... Solid acid catalyst plays a crucial role in the petroleum refinery industry and bio-refinery technology.In this work,p-phenolsulfonic acid(PSA)was successfully grafted onto the surface of KH560-modified zirconium phosphate(K-ZrP)in a facile routine.The structure and property of this organic-inorganic combined solid acid PSA/K-ZrP-x were characterized via XRD,FTIR,13C solid-state NMR,TG,N2 adsorption-desorption,SEM,pyridine-adsorption FTIR and XPS technologies.The characterization results showed that KH560 can bond with ZrP and promote the grafting of PSA on the surface of K-ZrP via the condensation reaction between its epoxy ring and the phenolic hydroxyl group in PSA.Consequently,PSA/K-ZrP-2 exhibited excellent performance and stability in the transesterification between glycerol and methyl acetate among the tested H3PW12O40,Amber-lyst-45,HBEA,HZSM-5,ZrP,AlCl3 and FeCl3 catalysts.The calculated conversion of glycerol reached 81.3%with a 97.9%selectivity for monoacetin(MAG)and diacetin(DAG)with a 2.2%dosage of[H+]at 100℃ for 4 h.The highest specific activity of PSA/K-ZrP-2 reached 24028.2 mg-glycerol/g-cat/h in a short reaction time(at 0.17 h),and it could be recycled five times without obvious deactivation. 展开更多
关键词 Solid acid catalyst p-Phenolsulfonic acid Zirconium phosphate Glycerol Transesterification
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MoO_3/SO_42--TiO_2 catalyst for transesterification of dimethyl cabonate with phenol 认领 引用 被引量：1
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作者 崔丽萍 李彦君 +1 位作者 李忠 赵君芙 《Journal of Central South University》 SCIE EI CAS 2014年第5期1719-1724,共6页
A new MoO3/SO4 2--TiO2 catalyst was prepared by a conventional impregnation of SO4 2-/TiO2 as carrier with an aqueous solution of ammonium molybdate and used for the synthesis of transesterification of dimethyl carbon... A new MoO3/SO4 2--TiO2 catalyst was prepared by a conventional impregnation of SO4 2-/TiO2 as carrier with an aqueous solution of ammonium molybdate and used for the synthesis of transesterification of dimethyl carbonate(DMC)with phenol.A series of MoO3/SO4 2--TiO2 catalysts with different MoO3 loadings were investigated and characterized using X-ray diffraction(XRD),Fourier transform infrared spectrometer(FTIR),NH3-temperature programmed desorption(NH3-TPD)and X-ray photoelectron spectroscopy(XPS).The results show that MoO3 loading is related to the activity of transesterification reaction.With the increase of MoO3 loading,the activity of transesterification reaction increases.The sulfur species in the catalyst have an influence on the molybdenum species,and lead to an increase in the electropositive of molybdenum,which promotes the catalytic activity of MoO3/SO4 2--TiO2.Among the series of catalysts prepared,MoO3/SO4 2--TiO2 with 10% MoO3 and 823 K calcinated is found to be the most active catalyst for transesterification reaction.Under the reaction conditions of 453 K and 12 h,the conversion of DMC is 30.5 %,and the yields of MPC and DPC reach 21.2 % and 8.7 %,respectively. 展开更多
关键词 dimethyl carbonate diphenyl carbonate transesterification MoO3
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Polyoxometalates Pillared Hydrotalcite:Synthesis and Catalysis in Transesterification of Dimethyl Carbonate and Phenol 认领 引用 被引量：1
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作者 罗生军 迟瑛楠 胡长文 《Journal of Beijing Institute of Technology》 EI CAS 2009年第2期229-232,共4页
The salts of para-tungstic and para-molybdic were heterogenized for their effective use as solid catalysts in the transesterification reaction of dimethyl carbonate and phenol by inserting them between the layers of M... The salts of para-tungstic and para-molybdic were heterogenized for their effective use as solid catalysts in the transesterification reaction of dimethyl carbonate and phenol by inserting them between the layers of Mg2Al-hydrotalcite. These catalysts were characterized by FT-IR spectra and X-ray powder diffraction. Polyoxometalates （POMs） clusters were intercalated into the interlayer of layered double hydroxide （LDH） via anion exchange with organic acid precursor in Mg2Al-LDH, and the integrity of the clusters [W7O24 ]^6- and [Mo7O24 ]^6- was maintained. The intercalated para-molybdic cluster showed high catalytic activity and reusability in the transesterification under mild reaction conditions. When the reaction was carried out at 180 ℃, with a molar ratio of phenol to DMC of 1 ： 1, a reaction time 10 h, and a catalyst amount 1% （wt）, the conversion of phenol was 10.0 %, the selectivities of diphenyl carbonate and methyl phenyl carbonate were 10.7 % and 86.1%, respectively. 展开更多
关键词 polyoxometalates hydrotalcite transesterification diphenyl carbonate
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