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Zn(Ac)2-MgFe2O4复合催化剂的制备及有色涤纶一体化醇解脱色 认领 引用
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作者 朱亚楠 徐艺倩 李雯娟 《服装学报》 CAS 北大核心 2026年第1期1-10,共10页
为进一步提高有色涤纶醇解脱色效率,利用硅烷偶联剂KH560作为界面改性剂,制备Zn(Ac)2-MgFe2O4复合催化剂,对复合催化剂的形貌、元素、热稳定性、磁性能及催化醇解脱色能力进行表征;采用多因素实验探究有色涤纶的醇解条件。结... 为进一步提高有色涤纶醇解脱色效率,利用硅烷偶联剂KH560作为界面改性剂,制备Zn(Ac)2-MgFe2O4复合催化剂,对复合催化剂的形貌、元素、热稳定性、磁性能及催化醇解脱色能力进行表征;采用多因素实验探究有色涤纶的醇解条件。结果表明,偶联剂质量分数为1.0%时,复合催化剂的分散性能最好,且热化学性能稳定;当MgFeO4与Zn(Ac)2的质量比为1:3时,复合催化剂对涤纶的降解率及脱色率分别可达到98.9%和78.2%;复合催化剂质量分数为1.0%、反应温度为196℃、反应时间为180min,且乙二醇与涤纶的质量比为5:1时,涤纶的醇解脱色效果最佳;该复合催化剂经5次回收后,仍保持较高的稳定性和回收率,对有色涤纶的降解率可达到96.0%。 展开更多
关键词 乙酸锌 铁酸镁 复合催化剂 醇解脱色 有色涤纶降解
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Novel promoting effects of cerium on the activities of NO_x reduction by NH_3 over TiO_2-SiO_2-WO_3 monolith catalysts 认领 引用 被引量：15
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作者 房志涛 林涛 +3 位作者 徐海迪 吴干学 孙萌萌 陈耀强 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第10期952-959,共8页
A series of catalysts were prepared by doping different loadings of CeO2 over TiO2-SiO2-WO3 and used for the selective catalytic reduction of NOx by NH3. The experimental results showed that the selective catalytic re... A series of catalysts were prepared by doping different loadings of CeO2 over TiO2-SiO2-WO3 and used for the selective catalytic reduction of NOx by NH3. The experimental results showed that the selective catalytic reduction（SCR） performance and SO2-resistant ability of TiO2-SiO2-WO3 were greatly enhanced by the introduction of cerium. The catalyst containing 10% CeO2 showed the highest NO conversion in a wide temperature range and good N2 selectivity with broad operation temperature window at the gas hourly space velocity（GHSV） of 30000 h–1, which was a very promising catalyst for NOx abatement from diesel engine exhaust. The catalysts were characterized by X-ray diffraction（XRD）, scanning electron microscopy with energy dispersive X-ray spectroscopy（SEM-EDS）, N2 adsorption-desorption（BET） and X-ray photoelectron spectroscopy（XPS）. The characterization results showed that the bigger pore radius, higher surface atomic concentration and dispersion of Ce and the abundant adsorbed oxygen on the surface of catalyst contributed to the best NH3-SCR performance of CeO2/TiO2-SiO2-WO3 catalyst containing 10% CeO2. 展开更多
关键词 NH3-SCR NO cerium CeO2/TiO2-SiO2-WO3 monolith catalyst rare earths
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Effect of TiO_2 surface properties on the SCR activity of NOx emission abatement catalyst 认领 引用 被引量：6
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作者 YEDai-qi TIANLiu-qing LIANGHong 《Journal of Environmental Sciences》 SCIE EI CAS 2002年第4期530-535,共6页
NOx emission abatement catalysts V 2O 5 supported on various TiO 2 including anatase, rutile and mixture of both were investigated with various physico\|chemical measurements such as BET, NH\-3\|TPD, NARP, XRD and so ... NOx emission abatement catalysts V 2O 5 supported on various TiO 2 including anatase, rutile and mixture of both were investigated with various physico\|chemical measurements such as BET, NH\-3\|TPD, NARP, XRD and so on, and the effect of TiO\-2 surface properties on the SCR(selective catalytic reduction) activity of V\-2O\-5/TiO\-2 catalysts was studied. It was found that the TiO\-2 surface properties had strong affect on the SCR activity of V\-2O\-5/TiO\-2 catalysts. The stronger acidic property resulted in the higher exposure of active sites as well as the higher SCR activity. 展开更多
关键词 NOx SCR(selective catalytic reduction) surface acidity V\-2O\-5/TiO\-2 catalyst
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Supporting IrO2 and IrRuOx nanoparticles on TiO2 and Nb-doped TiO2 nanotubes as electrocatalysts for the oxygen evolution reaction 认领 引用 被引量：3
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作者 Radostina V.Genova-Koleva Francisco Alcaide +4 位作者 Garbine Alvarez Pere L.Cabot Hans-Jürgen Grande María V.Martínez-Huerta Oscar Miguel 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2019年第7期227-239,共13页
IrO2 and IrRuOx(Ir:Ru 60:40 at%),supported by 50 wt%onto titania nanotubes(TNTs)and(3 at%Nb)Nb-doped titania nanotubes(Nb-TNTs),as electrocatalysts for the oxygen evolution reaction(OER),were synthesized and character... IrO2 and IrRuOx(Ir:Ru 60:40 at%),supported by 50 wt%onto titania nanotubes(TNTs)and(3 at%Nb)Nb-doped titania nanotubes(Nb-TNTs),as electrocatalysts for the oxygen evolution reaction(OER),were synthesized and characterized by means of structural,surface analytical and electrochemical techniques.Nb doping of titania significantly increased the surface area of the support from 145(TNTs)to 260 m2g-1(Nb-TNTs),which was significantly higher than those of the Nb-doped titania supports previously reported in the literature.The surface analytical techniques showed good dispersion of the catalysts onto the supports.The X-ray photoelectron spectroscopy analyses showed that Nb was mainly in the form of Nb(IV)species,the suitable form to behave as a donor introducing free electrons to the conduction band of titania.The redox transitions of the cyclic voltammograms,in agreement with the XPS results,were found to be reversible.Despite the supported materials presented bigger crystallite sizes than the unsupported ones,the total number of active sites of the former was also higher due to their better catalyst dispersion.Considering the outer and the total charges of the cyclic voltammograms in the range 0.1–1.4 V,stability and electrode potentials at given current densities,the preferred catalyst was Ir O2 supported on the Nb-TNTs.The electrode potentials corresponding to given current densities were between the smallest ones given in the literature despite the small oxide loading used in this work and its Nb doping,thus making the Nb-TNTs-supported IrO2 catalyst a promising candidate for the OER.The good dispersion of IrO2,high specific surface area of the Nb-doped supports,accessibility of the electroactive centers,increased stability due to Nb doping and electron donor properties of the Nb(IV)oxide species were considered the main reasons for its good performance. 展开更多
关键词 Nb-doped TiO2 nanotubes IrO2 catalyst IrRuOx catalyst Oxygen evolution reaction PEMWE
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Dual co‐catalysts Ag/Ti3C2/TiO2hierarchical flower‐like microspheres with enhanced photocatalytic H2‐production activity 认领 引用 被引量：6
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作者 Defa Liu Bin Sun +2 位作者 Shuojie Bai Tingting Gao Guowei Zhou 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2023年第7期273-283,共11页
Solar‐powered semiconductor photocatalysis is considered a powerful strategy for addressing environmental pollution and energy crisis.Nevertheless,the separation and transfer abilities of photogenerated photocatalyst... Solar‐powered semiconductor photocatalysis is considered a powerful strategy for addressing environmental pollution and energy crisis.Nevertheless,the separation and transfer abilities of photogenerated photocatalysts remain unsatisfactory.Herein,dual Ti3C2nanosheets/Ag co‐catalysts synergistically decorated hierarchical flower‐like TiO2microspheres for boosting photocatalytic H2production were fabricated by electrostatic self‐assembly and subsequent photoreduction procedures.The optimal Ag/Ti3C2/TiO2composite demonstrated an excellent photocatalytic H2‐production rate of 1024.72μmol g−1h−1under simulated solar irradiation,achieving nearly 40,2.3,and 1.8 folds with respect to that obtained on pristine TiO2,optimized Ti3C2/TiO2composite,and Ag/TiO2composite,respectively.The considerably improved photocatalytic H2‐production activity is associated with the synergistic effect of the hierarchical flower‐like structure of TiO2,excellent electrical conductivity of Ti3C2,and surface plasmon resonance effect of Ag,which enhances the light absorption capacity and promotes the separation and transfer of photogenerated carriers.This study provides insight into the design of high‐efficiency photocatalysts with dual co‐catalysts for solar H2production. 展开更多
关键词 Hierarchical flower‐like TiO2 microsphere Dual co‐catalysts Photocatalysis Synergistic effect H2production
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Fabrication of C@MoxTi1-xO2-δ nanocrystalline with functionalized interface as efficient and robust PtRu catalyst support for methanol electrooxidation 认领 引用 被引量：2
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作者 Jialong Li Lei Zhao +2 位作者 Xifei Li Sue Hao Zhenbo Wang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第1期7-14,I0001,共8页
A core shell structured C@MoxTi1-xO2-δnanocrystal with a functionalized interface(C@MTNC-FI)was fabricated via the hydrothermal method with subsequent annealing derived from tetrabutyl orthotitanate.The formation of ... A core shell structured C@MoxTi1-xO2-δnanocrystal with a functionalized interface(C@MTNC-FI)was fabricated via the hydrothermal method with subsequent annealing derived from tetrabutyl orthotitanate.The formation of anatase TiO2 was inhibited by the simultaneous presence of the hydrothermal etchingegrowth process,infiltration of Mo dopants and carbon coating,which endows the C@MTNC-FI with an ultrafine crystalline architecture that has a Mo-functionalized interface and carbon-coated shell.Pt Ru nanoparticles(NPs)were supported on C@MTNC-FI by employing a microwave-assisted polyol process(MAPP).The obtained Pt Ru/C@MTNC-FI catalyst has 2.68 times higher mass activity towards methanol electrooxidation than that of the un-functionalized catalyst(Pt Ru/C@TNC)and 1.65 times higher mass activity than that of Pt Ru/C catalyst with over 25%increase in durability.The improved catalytic performance is due to several aspects including ultrafine crystals of TiO2 with abundant grain boundaries,Mofunctionalized interface with enhanced electron interactions,and core shell architecture with excellent electrical transport properties.This work suggests the potential application of an interface-functionalized crystalline material as a sustainable and clean energy solution. 展开更多
关键词 Interface functionalization TiO2 Nanocrystalline Mo doping Core–shell PtRu catalyst Methanol electrooxidation
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Bifunctional TiO2 Catalysts for Efficient Cr(VI) Photoreduction Under Solar Light Irradiation Without Addition of Acids 认领 引用 被引量：2
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作者 Fu-cheng Shi Wen-dong Wang Wei-xin Huang 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2012年第2期214-218,I0004,共5页
Bifunctional TiO2 photocatalysts co-doped with nitrogen and sulfur were prepared by the controlled thermal decomposition of ammonium titanyl sulfate precursor. They have both photocatalytic activity and Brφnsted acid... Bifunctional TiO2 photocatalysts co-doped with nitrogen and sulfur were prepared by the controlled thermal decomposition of ammonium titanyl sulfate precursor. They have both photocatalytic activity and Brφnsted acidity, and thus are active in the photoreduction of Cr（VI） under solar light irradiation without the addition of acids. The activity is superior to that of Degussa P25 in the acidified suspension at the same pH adjusted by H2SO4. 展开更多
关键词 Cr（VI） photocatalytic reduction TiO2 Brcnsted acidity Bifunctional catalyst
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Low-Temperature Denitrification Performance of Cu2O/Activated Carbon Catalysts for Selective Catalytic Reduction of NOx by CO 认领 引用 被引量：3
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作者 WANG Defu HUANG Bangfu +3 位作者 LONG Hongming SHI Zhe LIU Lanpeng LI Lu 《Journal of Donghua University(English Edition)》 CAS 2020年第5期382-388,共7页
To improve the denitrification performance of carbon-based materials for sintering flue gas,we prepared a composite catalyst comprising coconut shell activated carbon(AC)modified by thermal oxidation air.The microstru... To improve the denitrification performance of carbon-based materials for sintering flue gas,we prepared a composite catalyst comprising coconut shell activated carbon(AC)modified by thermal oxidation air.The microstructure,the specific surface area,the pore volume,the crystal structure,and functional groups presented in the prepared Cu2O/AC catalysts were thoroughly characterized.By using scanning electron microscopy(SEM),nitrogen adsorption/desorption isotherms,Fourier-transform infrared(FTIR)spectroscopy and X-ray diffractometry(XRD),the effects of Cu2O loading and calcination temperature on Cu2O/AC catalysts were investigated at low temperature(150℃).The research shows that Cu on the Cu2O/AC catalyst is in the form of Cu2O with good crystalline performance and is spherical and uniformly dispersed on the AC surface.The loading of Cu2O increases the active sites and the specific surface area of the reaction gas contact,which is conducive to the rapid progress of the carbon monoxide selective catalytic reduction(CO-SCR)reaction.When the loading of Cu2O was 8%and the calcination temperature was 500℃,the removal rate of NOx facilitated by the Cu2O/AC catalyst reached 97.9%.These findings provide a theoretical basis for understanding the denitrification of sintering flue gas. 展开更多
关键词 thermal oxidation coconut shell activated carbon(AC) Cu2O/AC catalyst carbon monoxide selective catalytic reduction(CO-SCR) denitrification performance
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MnFe2O4-AC活化过硫酸盐降解四环素研究 认领 引用
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作者 魏哲 张欢 +1 位作者 曹龙涛 曹强 《广州化工》 CAS 2026年第4期59-62,73,共4页
近年来,抗生素废水污染问题凸显,典型四环素的降解将为抗生素废水的处置提供参考。本研究利用水热合成法将MnFe2O4负载在活性炭(AC)上,得到负载型复合催化剂MnFe2O4-AC。通过X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FT-IR)... 近年来,抗生素废水污染问题凸显,典型四环素的降解将为抗生素废水的处置提供参考。本研究利用水热合成法将MnFe2O4负载在活性炭(AC)上,得到负载型复合催化剂MnFe2O4-AC。通过X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FT-IR)对MnFe2O4-AC催化剂进行分析表征。考察了MnFe2O4-AC活化过硫酸盐(PDS)降解有机污染物的性能,探究了MnFe2O4-AC/PDS体系中催化剂投加量、四环素初始浓度、溶液pH值、PDS投加量对四环素降解率的影响。实验结果表明,MnFe2O4-AC投加量为0.8 g/L,四环素的浓度为5 mg/L,pH为7,PDS浓度为3 mmol/L,四环素的降解率可达92.39%。淬灭实验结果表明MnFe2O4-AC/PDS体系降解四环素的活性物种主要是SO4-·。 展开更多
关键词 MnFe2O4-AC催化剂 PDS 四环素降解率
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Comparative study of fluidized-bed and fixed-bed reactor for syngas methanation over Ni-W/TiO_2-SiO_2 catalyst 认领 引用 被引量：9
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作者 Bo Liu Shengfu Ji 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2013年第5期740-746,共7页
In this work,syngas methanation over Ni-W/TiO2-SiO2catalyst was studied in a fluidized-bed reactor(FBR)and its performance was compared with a fixed-bed reactor(FIXBR).The effects of main operating variables including... In this work,syngas methanation over Ni-W/TiO2-SiO2catalyst was studied in a fluidized-bed reactor(FBR)and its performance was compared with a fixed-bed reactor(FIXBR).The effects of main operating variables including feedstock gases space velocity,coke content,bed temperature and sulfur-tolerant stability of 100 h life were investigated.The structure of the catalysts was characterized by XRD,N2adsorptiondesorption and TEM.It is found that under same space velocity from 5000 h 1to 25000 h 1FBR gave a higher CH4yield,lower coke content,and lower bed temperature than those obtained in FIXBR.Ni-W/TiO2-SiO2catalyst possessed excellent sulfur-tolerant stability on the feedstock gases less than 500 ppm H2S in FBR.The carbon deposits formed on the spent catalyst were in the form of carbon fibers in FBR,while in the form of dense accumulation distribution appearance in FIXBR. 展开更多
关键词 syngas methanation Ni-W/TiO2-SiO2catalyst fluidized bed fixed bed
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TiO_2/wAC复合光催化剂的酸催化水解合成及表征 认领 引用 被引量：51
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作者 陈孝云 刘守新 +1 位作者 陈曦 孙承林 《物理化学学报》 SCIE CAS 北大核心 2006年第5期517-522,共6页
以TiCl4为钛源,采用酸催化水解法合成了活性炭(AC)复合光催化剂TiO2/wAC(w:AC的质量分数,%).通过对苯酚、甲基橙以及六价铬的光催化降解,考察了AC含量、反应溶液初始pH值、使用次数对TiO2/wAC光催化剂催化活性的影响,并采用重力沉降法... 以TiCl4为钛源,采用酸催化水解法合成了活性炭(AC)复合光催化剂TiO2/wAC(w:AC的质量分数,%).通过对苯酚、甲基橙以及六价铬的光催化降解,考察了AC含量、反应溶液初始pH值、使用次数对TiO2/wAC光催化剂催化活性的影响,并采用重力沉降法测试了催化剂分离性能.采用XRD、DRS、FTIR、SEM、低温液氮吸附等对光催化剂晶相结构、光谱特征、表面结构等进行了表征.结果表明,适宜AC含量的TiO2/wAC(wAC=5%,记为5AC)具有较高的光催化活性.AC掺杂可减小TiO2粒子凝聚,而对TiO2的晶相结构、晶粒大小以及表面性质影响不大,对TiO2能阈结构不产生影响.TiO2与AC结合牢固,接触界面处有Ti—O—C键生成.TiO2/5AC表现出高光催化活性的主要原因是,AC所提供的适宜高浓度环境及对纳米尺寸TiO2团聚的有效抑制.TiO2/5AC的高活性,不易失活,易分离以及活性受pH变化影响较小的特性,使其在实际废水处理方面具有潜在应用价值. 展开更多
关键词 TiO2 活性炭 酸催化水解 TiO2/AC复合光催化剂 机理
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Ho-modified Mn-Ce/TiO_2 for low-temperature SCR of NO_x with NH_3:Evaluation and characterization 认领 引用 被引量：29
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作者 Wei Li Cheng Zhang +4 位作者 Xin Li Peng Tan Anli Zhou Qingyan Fang Gang Chen 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第10期1653-1663,共11页
Low‐temperature selective catalytic reduction(SCR)of NO with NH3 was tested over Ho‐doped Mn–Ce/TiO2 catalysts prepared by the impregnation method.The obtained catalysts with different Ho doping ratios were charact... Low‐temperature selective catalytic reduction(SCR)of NO with NH3 was tested over Ho‐doped Mn–Ce/TiO2 catalysts prepared by the impregnation method.The obtained catalysts with different Ho doping ratios were characterized by Brunauer‐Emmett‐Teller(BET),X‐ray diffraction(XRD),temperature‐programmed reduction(H2‐TPR),temperature‐programmed desorption of NH3(NH3‐TPD),X‐ray photoelectron spectroscopy(XPS),and scanning electron microscopy(SEM).The catalytic activities were tested on a fixed bed.Their results indicated that the proper doping amount of Ho could effectively improve the low‐temperature denitrification performance and the SO2 resistance of Mn–Ce/TiO2 catalyst.The catalyst with Ho/Ti of 0.1 presented excellent catalytic activity,with a conversion of more than 90%in the temperature window of 140–220°C.The characterization results showed that the improved SCR activity of the Mn–Ce/TiO2 catalyst caused by Ho doping was due to the increase of the specific surface area,higher concentration of chemisorbed oxygen,higher surface Mn4+/Mn3+ratio,and higher acidity.The SO2 resistance test showed that the deactivating influence of SO2 on the catalyst was irreversible.The XRD and XPS results showed that the main reason for the catalyst deactivation was sulfates that had formed on the catalyst surface and that Ho doping could inhibit the sulfation to some extent. 展开更多
关键词 Mn–Ce–Ho/TiO2 Low‐temperature selective catalytic reduction Catalyst Holmium SO2
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Effects of Atmospheres and Precursors on MnO_x/TiO_2 Catalysts for NH_3-SCR at Low Temperature 认领 引用 被引量：17
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作者 方德 HE Feng +2 位作者 谢峻林 FU Zhengbing CHEN Junfu 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第5期888-892,共5页
The effects of atmospheres and precursors on MnOx/TiO2 catalysts were studied, which were prepared by the impregnation method and tested for their NOx conversion activity in ammonia selective catalytic reduction （NH3... The effects of atmospheres and precursors on MnOx/TiO2 catalysts were studied, which were prepared by the impregnation method and tested for their NOx conversion activity in ammonia selective catalytic reduction （NH3-SCR） reactions. Results showed that the manganese carbonate （MC） precursor caused mainly Mn2O3, while the manganese nitrate （MN） precursor resulted primarily in MnO2 and the manganese sulfate （MS） precursor was unchanged. The manganese acetate （MA） precursor leaded obtaining a mixture of Mn2O3 and Mn304. NOn conversion decreased in the following order： MA/TiO2 〉 MC/TiO2 〉 MN/TiO2 〉 MS/TiO2 〉 P25, with a calcination temperature of 773 K in air. Catalysts that were prepared by MA and calcined in oxygen performed strong interaction between Ti and Mn, while MnTiO3 was observed. Compared to the catalysts calcined in nitrogen, those calcined in oxygen had larger diameter and smaller surface area and pore. Catalysts that were prepared by MA and calcined in nitrogen tended to gain higher denitration rates than those in air, since they could be prepared with significant specific surface areas. NO., conversion decreased with calcination atmospheres： Nitrogen〉 Air〉 Oxygen. Meanwhile, amorphous Mn2O3 turned into crystalline Mn2O3, when the temperatures increased from 673 to 873 K. 展开更多
关键词 MnOx/TiO2 catalyst precursor atmosphere NH3-SCR
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Promoting effect and mechanism of neodymium on low-temperature selective catalytic reduction with NH3 over Mn/TiO2 catalysts 认领 引用 被引量：8
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作者 Peng Wu Yaping Zhang +3 位作者 Ke Zhuang Kai Shen Sheng Wang Tianjiao Huang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2020年第11期1215-1223,I0003,共9页
Series of Mn/TiO2 catalysts modified with various contents of Nd for low-temperature SCR were synthesized.It can be found that the appropriate amount of Nd can markedly reduce the take-off temperature of Mn/TiO2 catal... Series of Mn/TiO2 catalysts modified with various contents of Nd for low-temperature SCR were synthesized.It can be found that the appropriate amount of Nd can markedly reduce the take-off temperature of Mn/TiO2 catalyst to 80℃and NOx conversion is stabilized over 90%in the wide temperature range of 100-2600 C.0.1 Nd-Mn/Ti shows higher N2 selectivity and better SO2 resistance than Mn/Ti catalyst.The results reveal that Nd-doped Mn/TiO2 catalyst exhibits larger BET surface area and better dispersion of active component Mn2O3.XPS results indicate that the optimal 0.1 Nd-Mn/Ti sample possesses higher concentration of Mn4+and larger amount of adsorbed oxygen at the surface compared with the unmodified counterpart.In situ DRIFTS show that the surface acidity is evidently increased after adding Nd,especially,the Lewis acid sites,and the intermediate(-NH2)is more stable.The reaction mechanism over Mn/Ti and 0.1 Nd-Mn/Ti catalysts obey the Eley-Rideal(E-R)mechanisms under low temperature reaction conditions.H2-TPR results show that Nd-Mn/TiO2 catalyst exhibits better lowtemperature redox properties. 展开更多
关键词 Nd modification Mn/TiO2 catalyst Low-temperature Selective catalyst reduction Mechanism Rare earths
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Selective catalytic oxidation of NO with O_2 over Ce-doped MnO_x/TiO_2 catalysts 认领 引用 被引量：29
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作者 Xiaohai Li Shule Zhang +2 位作者 Yong Jia Xiaoxiao Liu Qin Zhong 《Journal of Natural Gas Chemistry》 CSCD 2012年第1期17-24,共8页
A series of Ce-doped MnOx/TiO2 catalysts were prepared by impregnation method and used for catalytic oxidation of NO in the presence of excess O2. The sample with the Ce doping concentration of Ce/Mn=l/3 and calcined ... A series of Ce-doped MnOx/TiO2 catalysts were prepared by impregnation method and used for catalytic oxidation of NO in the presence of excess O2. The sample with the Ce doping concentration of Ce/Mn=l/3 and calcined at 300 ℃ shows a superior activity for NO oxidation to NO2. On Ce（1）Mn（3）Ti catalyst, 58% NO conversion was obtained at 200 ℃ and 85% NO conversion at 250 ℃ with a GHSV of 41000 h-1, which was much higher than that over MnOx/TiO2 catalyst （48% at 250 ℃）. Characterization results implied that the higher activity of Ce（1）Mn（3）Ti could be attributed to the enrichment of well-dispersed MnO2 on the surface and the abundance of Mn3＋ and Zi3＋ species. The addition of Ce into MnO2/TiO2 could improve oxygen storage capacity and facilitate oxygen mobility of the catalyst as shown by PL and ESR, so that its activity for NO oxidation could be enhanced. The effect of H2O and SO2 on the catalyst activity was also investigated. 展开更多
关键词 selective catalytic oxidation （SCO） of NO MnOx/TiO2 catalysts Ce-doped catalysts
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The Effect of Titania Structure on Ni/TiO_2 Catalysts for p-Nitrophenol Hydrogenation 认领 引用 被引量：12
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作者 陈日志 杜艳 +1 位作者 邢卫红 徐南平 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2006年第5期665-669,共5页
The catalytic hydrogenation of p-nitrophenol to p-aminophenol was investigated over Ni/TiO2 catalysts prepared by a liquid-phase chemical reduction method. The catalysts were characterized by inductively coupled plasm... The catalytic hydrogenation of p-nitrophenol to p-aminophenol was investigated over Ni/TiO2 catalysts prepared by a liquid-phase chemical reduction method. The catalysts were characterized by inductively coupled plasma (ICP), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) and temperature-programmed reduction (TPR). Results show that the titania structure has favorable influence on physio-chemical and catalytic properties of Ni/TiO2 catalysts. Compared to commercial Raney nickel, the catalytic activity of Ni/TiO2 catalyst is much superior, irrespective of the titania structure. The catalytic activity of anatase titania supported nickel catalyst Ni/TiO2(A) is higher than that of rutile titania supported nickel catalyst Ni/TiO2(R), possibly because the reduction of nickel oxide to metallic nickel for Ni/TiO2(A) is easier than that for Ni/TiO2(R) at similar reaction conditions. 展开更多
关键词 p-nitrophenol catalytic hydrogenation p-aminophenol Ni/TiO2 catalyst
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Improving the denitration performance and K-poisoning resistance of the V_2O_5-WO_3/TiO_2 catalyst by Ce4+ and Zr4+ co-doping 认领 引用 被引量：22
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作者 Jun Cao Xiaojiang Yao +4 位作者 Fumo Yang Li Chen Min Fu Changjin Tang Lin Dong 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第1期95-104,共10页
A series of V2O5‐WO3/TiO2‐ZrO2,V2O5‐WO3/TiO2‐CeO2,and V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalysts were synthesized to improve the selective catalytic reduction(SCR)performance and the K‐poisoning resistance of a V2O5‐W... A series of V2O5‐WO3/TiO2‐ZrO2,V2O5‐WO3/TiO2‐CeO2,and V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalysts were synthesized to improve the selective catalytic reduction(SCR)performance and the K‐poisoning resistance of a V2O5‐WO3/TiO2 catalyst.The physicochemical properties were investigated by using XRD,BET,NH3‐TPD,H2‐TPR,and XPS,and the catalytic performance and K‐poisoning resistance were evaluated via a NH3‐SCR model reaction.Ce^4+and Zr^4+co‐doping were found to enhance the conversion of NOx,and exhibit the best K‐poisoning resistance owing to the largest BET‐specific surface area,pore volume,and total acid site concentration,as well as the minimal effects on the surface acidity and redox ability from K poisoning.The V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst also presents outstanding H2O+SO2 tolerance.Finally,the in situ DRIFTS reveals that the NH3‐SCR reaction over the V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst follows an L‐H mechanism,and that K poisoning does not change the reaction mechanism. 展开更多
关键词 V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst Co‐doping K‐poisoning NH3‐SCR Reaction mechanism
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负载型纳米TiO_2/AC对偶氮染料的光催化降解研究 认领 引用 被引量：21
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作者 孙剑辉 孙胜鹏 +2 位作者 乔利平 王晓蕾 祁巧艳 《环境科学学报》 CAS 北大核心 2006年第3期420-425,共6页
以钛酸四丁酯和粒状活性炭(AC)为主要原料,采用溶胶凝胶浸渍法制备出负载型纳米TiO2/AC催化剂。在流化床反应器中分别对2种典型的偶氮类染料橙黄G、活性艳红X3B模拟废水进行了光催化降解研究,探讨了pH值、外加氧化剂对光催化降解率的影... 以钛酸四丁酯和粒状活性炭(AC)为主要原料,采用溶胶凝胶浸渍法制备出负载型纳米TiO2/AC催化剂。在流化床反应器中分别对2种典型的偶氮类染料橙黄G、活性艳红X3B模拟废水进行了光催化降解研究,探讨了pH值、外加氧化剂对光催化降解率的影响,并对催化剂进行了回收再生利用试验.结果表明,TiO2/AC催化剂具有良好的光催化活性、吸附特性及可再生性,60min后对2种染料反应的光催化降解率分别可达到99.71%和97.12%,反应180min后的TOC去除率分别达到81.54%和81.99%;反应后TiO2/AC催化剂回收率大于95%,经焙烧再生后对橙黄G反应60min的光催化降解率仍高达95.93%. 展开更多
关键词 TiO2/AC 溶胶-凝胶-浸渍 偶氮染料 光催化
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Effect of Ce doping into V2O5-WO3/TiO2 catalysts on the selective catalytic reduction of NOx by NH3 认领 引用 被引量：27
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作者 Mengyin Chen Mengmeng Zhao +3 位作者 Fushun Tang Le Ruan Hongbin Yang Ning Li 《Journal of Rare Earths》 SCIE EI CAS CSCD 2017年第12期1206-1215,共10页
In this work, the effectiveness of V2O5-WO3/TiO2 catalysts modified with different CeO2 contents by impregnation and co-precipitation methods on the selective catalytic reduction of NOxby NH3 have been studied compara... In this work, the effectiveness of V2O5-WO3/TiO2 catalysts modified with different CeO2 contents by impregnation and co-precipitation methods on the selective catalytic reduction of NOxby NH3 have been studied comparatively by various experimental techniques. The results showed that the NO conversion of V2O5-WO3/CeO2-TiO2 catalysts modified by co-precipitation method obviously increased with the Ce doping contents in the studied range below 20%（All Ce contents are in mass fractions）, but the NO conversion of V2O5-WO3/CeO2/TiO2 catalysts modified by impregnation methods was lower than V2O5-WO3/CeO2-TiO2 catalysts especially beyond 2.5% Ce doping contents. The V2O5-WO3/CeO2-TiO2 catalysts showed better SCR activity, wider reaction window, and higher sulfur and water resistance. The characterization results elucidated that the modified catalysts by co-precipitation method exhibited higher specific surface area, much better dispersity of Ce component, more Ce^（3＋）species and more Br？nsted acid sites than that by impregnation. The vacancies caused by more Ce^（3＋）species were favorable for more NO oxidation to NO2, and the interaction between Ce species and WOxspecies generated more Br？nsted acid sites. It could be supposed that dispersed Ce Oxspecies and WOxspecies offered more second active centers respectively to adsorb oxygen and activate ammonia as co-catalysis to the primary active center of V ions, thus facilitated the better SCR activity of modified V2O5-WO3/CeO2-TiO2 catalysts by coprecipitation methods. The co-precipitation methods with Ce component were more suitable for production of modified commercial V2O5-WO3/TiO2 catalysts. 展开更多
关键词 V2O5-WO3/TiO2 catalysts Ce doping methods NH3 selective catalytic reduction NOx Dispersion state Reducibility Br?nsted acid sites
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高效光催化剂TiO_2/AC-M的制备及其对Cl_3CCOOH降解的研究 认领 引用 被引量：5
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作者 杨平 吴遵义 +1 位作者 华南平 杜玉扣 《石油化工》 EI CAS 北大核心 2004年第5期464-466,共3页
用浓盐酸处理活性炭负载的二氧化钛(TiO2/AC),合成了光催化剂TiO2/AC-M,采用Sol-gel方法制备了纯TiO2光催化剂。选择较难降解的Cl3CCOOH作为探针分子,比较了TiO2/AC-M,TiO2/AC,纯TiO2 3种催化剂的催化活性。实验结果表明,TiO2/AC-M光催... 用浓盐酸处理活性炭负载的二氧化钛(TiO2/AC),合成了光催化剂TiO2/AC-M,采用Sol-gel方法制备了纯TiO2光催化剂。选择较难降解的Cl3CCOOH作为探针分子,比较了TiO2/AC-M,TiO2/AC,纯TiO2 3种催化剂的催化活性。实验结果表明,TiO2/AC-M光催化剂的催化活性分别是TiO2/AC和纯TiO2光催化剂催化活性的2.08倍和3.18倍。同时还简单探讨了TiO2/AC-M光催化剂具有高催化活性的原因。 展开更多
关键词 光催化降解 TiO2/AC—M 三氯乙酸 光催化剂 TiO2/AC TiO2
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