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共沉淀法制备Ag-ZrO2-SiO2催化剂及其乙醇制丁二烯性能研究 认领 引用
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作者 柳蒙蒙 余淦 +3 位作者 贾伯阳 黄明真 崔燕冉 陈亚松 《低碳化学与化工》 CAS 北大核心 2026年第5期61-67,共7页
开发新型乙醇制丁二烯催化剂是实现传统丁二烯生产路线替代的关键。采用共沉淀法,通过调控Zr前驱体浓度,制备了系列Ag-ZrO2-SiO2催化剂。利用XRD、SEM、N2吸/脱附、ICP-OES和Py-IR等手段,对催化剂进行了表征,并利用固定床反应... 开发新型乙醇制丁二烯催化剂是实现传统丁二烯生产路线替代的关键。采用共沉淀法,通过调控Zr前驱体浓度,制备了系列Ag-ZrO2-SiO2催化剂。利用XRD、SEM、N2吸/脱附、ICP-OES和Py-IR等手段,对催化剂进行了表征,并利用固定床反应器评价了催化剂乙醇制丁二烯催化性能,探究了酸性调控对催化剂催化性能的影响。结果表明,通过调控Zr前驱体浓度,优化催化剂Lewis酸量及其强度分布,可以促进乙醛C—C耦合主反应,同时抑制乙醇脱水生成乙烯等副反应。在温度为420℃、重时空速为0.3 h-1的反应条件下,AZS-2催化剂(制备过程ZrO(NO3)2溶液质量分数为10%)具有最佳催化性能,其乙醇转化率为80.0%,丁二烯选择性为47.3%,乙烯选择性显著低于其他催化剂。 展开更多
关键词 Ag-ZrO2-SiO2催化剂 共沉淀法 乙醇制丁二烯 Lewis酸调控
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The effect of ethanol on the performance of CrO_x/SiO_2 catalysts during propane dehydrogenation 认领 引用 被引量：5
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作者 李利娜 朱文良 +6 位作者 石磊 刘勇 刘红超 倪友明 刘世平 周慧 刘中民 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第3期359-366,共8页
The effects of ethanol vapor pretreatment on the performance of CrOx/SiO2 catalysts during the dehydrogenation of propane to propylene were studied with and without the presence of CO2.The catalyst pretreated with eth... The effects of ethanol vapor pretreatment on the performance of CrOx/SiO2 catalysts during the dehydrogenation of propane to propylene were studied with and without the presence of CO2.The catalyst pretreated with ethanol vapor exhibited better catalytic activity than the pristine CrOx/SiO2,generating 41.4% propane conversion and 84.8% propylene selectivity.The various catalyst samples prepared were characterized by X-ray diffraction,transmission electron microscopy,temperature-programmed reduction,X-ray photoelectron spectroscopy and reflectance UV-Vis spectroscopy.The data show that coordinative Cr^3＋ species represent the active sites during the dehydrogenation of propane and that these species serve as precursors for the generation of Cr^3＋.Cr^3＋ is reduced during the reaction,leading to a decrease in catalytic activity.Following ethanol vapor pretreatment,the reduced CrOx in the catalyst is readily re-oxidized to Cr^6＋ by CO2.The pretreated catalyst thus exhibits high activity during the propane dehydrogenation reaction by maintaining the active Cr^3＋ states. 展开更多
关键词 Propane Dehydrogenation CrOx/SiO2 catalyst Ethanol vapor pretreatment Carbon dioxide
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老化处理促进Cu/SiO2原位还原增强糠醛加氢制糠醇反应性能 认领 引用
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作者 高雯雯 梁越 +1 位作者 王金山 王康军 《低碳化学与化工》 CAS 北大核心 2026年第5期36-45,共10页
将生物质衍生物糠醛通过选择加氢转化为糠醇是实现生物质资源转化利用的重要途径之一。Cu/SiO2催化剂是工业领域常用加氢催化剂,但其在糠醛加氢反应中仍存在催化活性不足的问题。采用共沉淀法制备了Cu/SiO2催化剂,然后分别在常温... 将生物质衍生物糠醛通过选择加氢转化为糠醇是实现生物质资源转化利用的重要途径之一。Cu/SiO2催化剂是工业领域常用加氢催化剂,但其在糠醛加氢反应中仍存在催化活性不足的问题。采用共沉淀法制备了Cu/SiO2催化剂,然后分别在常温、60℃、80℃、100℃和120℃下进行老化处理,研究了老化温度对Cu/SiO2催化剂糠醛加氢制糠醇催化性能的影响,并分析了反应前后催化剂的结构变化情况。结果表明,在20 mL糠醛、催化剂用量为0.2 g、反应温度为180℃、反应压力为3.5 MPa和反应时间为2 h的最佳反应条件下,60℃下老化所得催化剂(Cu/SiO2(60))表现出良好的催化性能,其糠醛转化率为99.0%,糠醇选择性为96.2%。适宜的老化温度(60℃)可有效促进Cu2+物种在反应过程中原位还原为Cu0、Cu+物种,这有助于提高Cu物种分散性,减小Cu物种尺寸,从而提高催化剂催化性能。 展开更多
关键词 Cu/SiO2催化剂 老化温度 糠醛加氢 原位还原
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Synthesis of Methyl Glycolate by Hydrogenation of Dimethyl Oxalate over Cu-Ag/SiO2Catalyst 认领 引用 被引量：26
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作者 Baowei Wang Qian Xu +1 位作者 Hua Song Genhui Xu 《Journal of Natural Gas Chemistry》 2007年第1期78-80,共3页
Methyl glycolate is a good solvent and can be used as feedstock for the synthesis of some important organic chemicals.Catalytic hydrogenation of dimethyl oxalate(DMO)over copper-silver catalyst supported on silica was... Methyl glycolate is a good solvent and can be used as feedstock for the synthesis of some important organic chemicals.Catalytic hydrogenation of dimethyl oxalate(DMO)over copper-silver catalyst supported on silica was studied.The Cu-Ag/SiO2 catalyst supported on silica sol was prepared by homogeneous deposition-precipitation of the mixture of aqueous euprammonia complex and silica sol.The proper active temperature of Cu-Ag/SiO2 catalyst for hydrogenation of DMO was 523-623 K.The most preferable reaction conditions for methyl glycolate(MG)were optimized:temperature at 468-478 K,40-60 mesh catalyst diameter,H2/DMO ratio 40,and 1.0 h^-1 of LHSV. 展开更多
关键词 dimethyl oxalate methyl glycolate ethylene glycol hydrogenation Cu-Ag/SiO2 catalyst
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Efficient Direct Synthesis of Indole over Novel Ag/SiO_2 Catalyst 认领 引用 被引量：6
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作者 石雷 王新平 《催化学报》 2001年第5期413-414,共2页
关键词 吲哚 催化合成 Ag/SiO2催化剂 催化活性 二氧化硅负载银催化剂
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Application of the Solvothermal Process in the Synthesis of High-performance Ag/γ-Al_2O_3 Catalysts 认领 引用
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作者 唐清 李锐星 +3 位作者 殷澍 Shingo Goto Daisuke Nagai Tsugio Sato 《过程工程学报》 EI CAS 北大核心 2006年第4期633-638,共6页
Ag/γ-Al2O3 is a kind of promising catalyst with the relatively lower cost compared with those using noble metals,good resistance against catalytic poisoning and excellent behaviour for NOx removal.In the present stud... Ag/γ-Al2O3 is a kind of promising catalyst with the relatively lower cost compared with those using noble metals,good resistance against catalytic poisoning and excellent behaviour for NOx removal.In the present study,Ag/γ-Al2O3 catalysts were synthesized by the solvothermal process and characterized by XRD,TG?DTA,TEM,UV?Vis and FT?IR.It was found that high-performance Ag/γ-Al2O3 catalysts could be synthesized by properly selecting starting materials,controlling the composition of solvent and other reaction conditions.The microstructure evolution of the catalysts was also discussed. 展开更多
关键词 Ag/γ-Al2O3 solvothermal process catalyst microstructure
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Partial oxidation of methane over SiO2 supported Ni and NiCe catalysts 认领 引用 被引量：4
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作者 A.Emamdoust V.La Parola +3 位作者 G.Pantaleo M.L.Testa S.Farjami Shayesteh A.M.Venezia 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第8期1-9,I0001,共9页
Nickel and nickel-ceria catalysts supported on high surface area silica, with 6 wt% Ni and 20 wt% CeO2 were prepared by microwave assisted(co) precipitation method. The catalysts were investigated by XRD,TPR and XPS a... Nickel and nickel-ceria catalysts supported on high surface area silica, with 6 wt% Ni and 20 wt% CeO2 were prepared by microwave assisted(co) precipitation method. The catalysts were investigated by XRD,TPR and XPS analyses and they were tested in partial oxidation of methane(CPO). The catalytic reaction was carried out at atmospheric pressure in a temperature range of 400–800℃ with a feed gas mixture containing methane and oxygen in a molecular ratio CH4/O2=2. The Ni catalyst exhibited 60% methane conversion with 60% selectivity to CO already at 500℃. On the contrary, the Ni–Ce catalyst was inert to CPO up to 700℃. Moreover, the former catalyst reproduced its activity at the descending temperatures maintaining a good stability at 600℃, over a reaction time of 80 h, whereas the latter one completely deactivated. Test of CH4 temperature programmed surface reaction(CH4-TPSR) revealed a higher methane activation temperature(> 100℃) for the Ni–Ce catalyst as compared to the Ni one. Noticeable improvement of the ceria containing catalyst occurred when the reaction test started at a temperature higher than the methane decomposition temperature. In this case, the sample achieved the same catalytic behavior of the Ni catalyst. As confirmed by XPS analyses, the distinct electronic state of the supported nickel was responsible for the differences in catalytic behavior. 展开更多
关键词 Methane catalytic partial oxidation(CPO) Ni catalyst NiCe SiO2 supported catalysts
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Dielectric barrier discharge plasma synthesis of Ag/γ-Al2O3 catalysts for catalytic oxidation of CO 认领 引用 被引量：2
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作者 陶云明 胥月兵 +4 位作者 常宽 陈美玲 Sergey A STAROSTIN 许虎君 林良良 《Plasma Science and Technology》 SCIE EI CAS CSCD 2023年第8期113-121,共9页
In this study,Ag/γ-Al2O3catalysts were synthesized by an Ar dielectric barrier discharge plasma using silver nitrate as the Ag source andγ-alumina(γ-Al2O3)as the support.It is revealed that plasma can r... In this study,Ag/γ-Al2O3catalysts were synthesized by an Ar dielectric barrier discharge plasma using silver nitrate as the Ag source andγ-alumina(γ-Al2O3)as the support.It is revealed that plasma can reduce silver ions to generate crystalline silver nanoparticles(Ag NPs)of good dispersion and uniformity on the alumina surface,leading to the formation of Ag/γ-Al2O3catalysts in a green manner without traditional chemical reductants.Ag/γ-Al2O3exhibited good catalytic activity and stability in CO oxidation reactions,and the activity increased with increase in the Ag content.For catalysts with more than 2 wt%Ag,100%CO conversion can be achieved at 300°C.The catalytic activity of the Ag/γ-Al2O3catalysts is also closely related to the size of theγ-alumina,where Agano-γ-Al2O3catalysts demonstrate better performance than Ag/micro-γ-Al2O3catalysts with the same Ag content.In addition,the catalytic properties of plasma-generated Agano-γ-Al2O3(Ag/γ-Al2O3-P)catalysts were compared with those of Agano-γ-Al2O3catalysts prepared by the traditional calcination approach(Ag/γ-Al2O3-C),with the plasma-generated samples demonstrating better overall performance.This simple,rapid and green plasma process is considered to be applicable for the synthesis of diverse noble metal-based catalysts. 展开更多
关键词 DBD plasma plasma nanofabrication noble metal nanoparticles CO oxidation Ag/-Al2O3 catalysts
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Active Fischer-Tropsch synthesis Fe-Cu-K/SiO_2 catalysts prepared by autocombustion method without a reduction step 认领 引用 被引量：1
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作者 Suthasinee Pengnarapat Peipei Ai +3 位作者 Prasert Reubroycharoen Tharapong Vitidsant Yoshiharu Yoneyama Noritatsu Tsubaki 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2018年第2期432-438,共7页
The purpose of this study was to prepare iron-based catalysts supported on silica by autocombustion method for directly using for Fischer-Tropsch synthesis（FTS） without a reduction step. The effect of different citr... The purpose of this study was to prepare iron-based catalysts supported on silica by autocombustion method for directly using for Fischer-Tropsch synthesis（FTS） without a reduction step. The effect of different citric acid（CA）：iron nitrate（N） molar ratios and acid types on the FTS performance of catalysts were investigated. The CA：N molar ratios had an important influence on the formation of iron active phases and FTS activity. The iron carbide（FexC）, which is known to be one of the iron active phases, was demonstrated by the X-ray diffraction and X-ray photoelectron spectroscopy. Increasing the CA：N molar ratios up to 0.1 increased CO conversion of catalyst to 86.5%, which was then decreased markedly at higher CA：N molar ratios. An excess of CA resulted in carbon residues covering the catalyst surface and declined FTS activity. The optimal catalyst（CA：N molar ratio = 0.1） achieved the highest CO conversion when compared with other autocombustion catalysts as well as reference catalyst prepared by impregnation method, followed by a reduction step. The autocombustion method had the advantage to synthesize more efficient catalysts without a reduction step. More interestingly, iron-based FTS catalysts need induction duration at the initial stage of FTS reaction even after reduction, because metallic iron species need time to be transformed to FexC. But here, even if without reduction, FexC was formed directly by autocombustion and induction period was eliminated during FTS reaction. 展开更多
关键词 Fischer-Tropsch synthesis Iron-based catalysts Autocombustion Iron carbide SiO2
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Effect of ZnO on the performance of Ag/SiO2 catalyst for the vapor-phase synthesis of 3-methylindole 认领 引用 被引量：2
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作者 Yang Hu Wenhui Lu +3 位作者 Dongyan Liu Jing Liu Lei Shi Qi Sun 《Journal of Natural Gas Chemistry》 2009年第4期445-448,共4页
The vapor-phase synthesis of 3-methylindole over Ag/SiO2 doped with ZnO was investigated.The catalysts were characterized by XRD,H2-TPR,NH3-TPD and TG techniques.The results indicated that ZnO promoter greatly enhance... The vapor-phase synthesis of 3-methylindole over Ag/SiO2 doped with ZnO was investigated.The catalysts were characterized by XRD,H2-TPR,NH3-TPD and TG techniques.The results indicated that ZnO promoter greatly enhanced the initial activity of the catalyst but disfavored its stability.H2-TPR and XRD results showed that the reduction peak of Ag2O shifted to higher temperature and the intensity of silver diffraction peaks was much weaker after the addition of ZnO promoter to Ag/SiO2.This indicated that there existed the interaction between Ag2O and SiO2-ZnO which promoted the silver particles dispersing on the support and inhibited the sintering of silver during the reaction.NH3-TPD and TG results revealed that the acid amounts of the catalyst and coking increased after adding ZnO to Ag/SiO2,which resulted in the deactivation of Ag/SiO2-ZnO catalyst rapidly. 展开更多
关键词 ZnO Ag/SiO2 3-methylindole initial activity selectivity stability
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Influence of V/P Ratio on the Catalytic Performance of VPO/SiO_2 Catalysts for Ammoxidation of Chloro-Substituted Toluenes 认领 引用 被引量：1
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作者 DONG Yanling XU Longlong +4 位作者 ZHANG Zhenguo LIU Wenhui LI Xiongjian ZHONG Yalan HUANG Chi 《Wuhan University Journal of Natural Sciences》 CAS CSCD 2019年第1期23-29,共7页
A series of vanadium phosphate oxide(VPO) catalysts supported on silica(VPO/Si O2) with various mole ratios of V/P(nV:nP=1:0.8-1:3) were prepared through impregnation method. The catalytic activity was evaluated by am... A series of vanadium phosphate oxide(VPO) catalysts supported on silica(VPO/Si O2) with various mole ratios of V/P(nV:nP=1:0.8-1:3) were prepared through impregnation method. The catalytic activity was evaluated by ammoxidation reactions of several kinds of chloro-substituted toluenes(CT) in a fixed-bed reactor. The catalyst presented the best performance when nV:nP is 1:1.6. The prepared catalysts were characterized by N2 adsorption, hydrogen temperature programmed reduction(TPR) and ammonia temperature programmed desorption(TPD) and etc. The results reveal that P can decrease the bonding energy of V=O and increase the mobility of lattice oxygen which was beneficial for the improvement of the catalysts, while too much P can greatly decrease the average oxidation number of V which leads to deactivation of the catalysts. The surface acidity of the VPO/Si O2 catalysts is affected by nV:nP and the catalyst had the highest surface acidity when nV:nP is 1:1.6. The selectivity of catalysts is proportional to the surface acidity when nV:nP is lower than 1:3.0. 展开更多
关键词 ammoxidation VPO/SiO2 catalyst substituted toluenes substituted benzonitriles
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Preparation of Spherical MgCl_2/SiO_2/THF-Supported Late-Transition Metal Catalysts for Ethylene Polymerization 认领 引用
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作者 Bai Wei Gao Xianglu +2 位作者 Wu Haotian Cao Chengang Jiang Tao 《China Petroleum Processing & Petrochemical Technology》 CAS 2014年第3期77-83,共7页
A facile and user friendly technique to immobilize the late-transition metal complexes on spherical MgCl2/SiO2/THF support has been developed. The spherical MgCl2/SiO2/THF-supported late-transition metal catalysts 2,6... A facile and user friendly technique to immobilize the late-transition metal complexes on spherical MgCl2/SiO2/THF support has been developed. The spherical MgCl2/SiO2/THF-supported late-transition metal catalysts 2,6-bis-[1-(2,6-dimethylphenylimino)ethyl]pyridine iron(II) dichloride(SC-A) and 1,4-bis(2,6-dimethylphenyl)- acenaphthene diimine nickel(II) dibromide(SC-B) for ethylene polymerization has been prepared by spray-drying technique using tetrahydrofuran suspension containing MgCl2, SiO2 and late-transition metal complexes. The catalysts were characterized by BET, XRD, SEM and the polymers were analyzed using GPC, DSC and 13C-NMR. The test results show that spray-drying is a very effective method for immobilizing late-transition metal catalysts for ethylene polymerization. Among six kinds of cocatalysts for olefin polymerization, TMA and TEA were confirmed to be more effective than other compounds for the ethylene polymerization system using the catalyst SC-A. For the case of the catalyst SC-B, DEAC showed the best performance as cocatalysts in ethylene polymerization. The replication of the catalyst morphology was found in the resultant polyethylene. 展开更多
关键词 MgCl2/SiO2/THF support late-transition metal catalyst polymerization of ethylene spray-drying
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CO_2 HYDROGENATION OVER SiO_2-SUPPORTED HETEROBINUCLEAR METAL COMPLEX CATALYSTS 认领 引用
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作者 Chang Ping SHAO 《Chinese Chemical Letters》 SCIE CAS 1995年第12期1081-1082,共2页
The SiO2-Supported (PPh3)2HPt(μ-CO) (μ-PPh2)M(CO) 4 (M-Cr.Mo, W) complel catalysts catalyzing CO2 hydrogenation are reported.The catalysts exhibited high catalytic activity and selectivity toward oxygenates
关键词 SiO2 OVER SUPPORTED HETEROBINUCLEAR HYDROGENATION METAL CO2 CATALYSTS 二氧化碳
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CATALYTIC PERFORMANCE OF ETHYLENE HYDROFORMYLATION OVER[H_XRu_3(CO)_9(CCO)]2-X/SiO_2-Al_2O_3,SiO_2 AND MgO(X=0-2)CATALYSTS 认领 引用
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作者 Feng Shou XIAO RuRen XU Masaru ICHIKAWA Duward F.SHRIVER Xie Xian GUO 《Chinese Chemical Letters》 SCIE CAS 1991年第7期579-580,共2页
The various surface species[H_XRu_3(CO)_9(CCO)]2-X(X=0-2)prepared from impregnation of[PPN]_2[Ru_3(CO)_9(CCO)]on SiO_2-Al_2O_3,SiO_2 and MgO show quite different activities and selectivities for oxygenates and etha... The various surface species[H_XRu_3(CO)_9(CCO)]2-X(X=0-2)prepared from impregnation of[PPN]_2[Ru_3(CO)_9(CCO)]on SiO_2-Al_2O_3,SiO_2 and MgO show quite different activities and selectivities for oxygenates and ethane in ethylene hydroformylation. 展开更多
关键词 CCO X=0-2)CATALYSTS CATALYTIC PERFORMANCE OF ETHYLENE HYDROFORMYLATION OVER[HXRu3 X SiO2-Al2O3,SiO2 AND MgO MgO Al
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SiO_2/Ag核壳结构纳米粒子的制备及表征 认领 引用 被引量：12
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作者 胡永红 容建华 +1 位作者 刘应亮 满石清 《化学学报》 SCIE CAS 北大核心 2005年第24期2189-2193,共5页
以金纳米粒子为表面晶种,通过化学还原的方法制备了二氧化硅/银核壳复合纳米粒子.采用TEM,XRD及UV/vis对其结构、形貌以及光学性质进行了表征和研究,结果表明所得到的复合粒子粒径均匀、银纳米壳光滑完整,厚度可控.并且随着银纳米壳厚... 以金纳米粒子为表面晶种,通过化学还原的方法制备了二氧化硅/银核壳复合纳米粒子.采用TEM,XRD及UV/vis对其结构、形貌以及光学性质进行了表征和研究,结果表明所得到的复合粒子粒径均匀、银纳米壳光滑完整,厚度可控.并且随着银纳米壳厚度的增大,其光学等离子体共振峰逐渐蓝移.而当银纳米粒子在二氧化硅胶粒表面上生长的过程中,它们的共振峰又逐渐红移,直到完整的银壳形成. 展开更多
关键词 SiO2胶体粒子 Ag纳米粒子 SiO2/Ag核壳粒子 等离子体共振吸收
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Effect of SiO2 addition on NH4HSO4 decomposition and SO2 poisoning over V2O5-MoO3/TiO2-CeO2 catalyst 认领 引用 被引量：11
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作者 Chengqiang Zheng Teng Cheng +2 位作者 Linjun Yang Hao Wu Hongmei Fan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第5期279-291,共13页
The deposition of NH4 HSO4 and the poisoning effect of SO2 on SCR catalyst are the main obstacles that restrict the industrial application of CeO2-doped SCR catalysts.In this work,deposited NH4 HSO4 decomposition beha... The deposition of NH4 HSO4 and the poisoning effect of SO2 on SCR catalyst are the main obstacles that restrict the industrial application of CeO2-doped SCR catalysts.In this work,deposited NH4 HSO4 decomposition behavior and SO2 poisoning over V2 O5-MoO3/TiO2 catalysts modified with CeO2 and SiO2 were investigated.By the means of characterization analysis,it was found that the addition of SiO2 into VMo/Ti-Ce had an impact on the interaction existed between catalyst surface atoms and NH4 HSO4.Temperatureprogrammed methods and in situ diffused reflectance infrared Fourier transform spectroscopy(DRIFTS)experiments indicated that the doping of SiO2 promoted the decomposition of deposited NH4 HSO4 on VMo/Ti-Ce catalyst surface by reducing the thermal stability of NH4 HSO4 and enhancing the NH4 HSO4 reactivity with NO in low temperature.And this improvement may be the reason for the better catalytic activity than VMo/Ti-Ce in the case of NH4 HSO4 deposition.Accompanied with cerium sulfate species generated over catalyst surface,the conversion of SO2 to SO3 was inhibited in SiCe mixed catalyst.The addition of SiO2 could promote the decomposition of cerium sulfate,which may be a potential strategy to enhance the resistance of SO2 poisoning over CeO2-modifed catalysts. 展开更多
关键词 CeO2-doped SCR catalyst SiO2 addition NH4HSO4 decomposition SO2 poisoning Cerium sulfate
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Ag-SiO2-TiO2纳米包装对新鲜绿竹笋储藏品质的影响 认领 引用 被引量：9
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作者 张冬梅 王素雅 +2 位作者 杨茉 王瓅 周芹芹 《食品与发酵工业》 CAS CSCD 北大核心 2020年第15期147-153,共7页
在4℃,相对湿度85%条件下,以感官评分初步评判绿竹笋的储藏期限,结合亮度,失重率,呼吸强度,总酸,纤维素含量,木质素含量,亚硝酸盐含量及微生物数量等指标评价保鲜效果。结果表明:无包装绿竹笋储藏期为12 d,普通真空包装绿竹笋的储藏期为... 在4℃,相对湿度85%条件下,以感官评分初步评判绿竹笋的储藏期限,结合亮度,失重率,呼吸强度,总酸,纤维素含量,木质素含量,亚硝酸盐含量及微生物数量等指标评价保鲜效果。结果表明:无包装绿竹笋储藏期为12 d,普通真空包装绿竹笋的储藏期为16 d,纳米真空包装的绿竹笋可储藏20 d。储藏第20天时,Ag-SiO 2-TiO 2纳米包装绿竹笋的感官评分为75.25分,亮度值为86.85,总酸含量为0.54 g/kg,纤维素含量为2.96 mg/g,木质素含量为0.72 mg/g。在4℃条件下,纳米真空包装处理可以保证绿竹笋的良好感官品相和可食用性,延长绿竹笋的储藏期限。因此,Ag-SiO 2-TiO 2纳米材料真空包装处理是一种良好的绿竹笋贮藏保鲜方法。 展开更多
关键词 新鲜绿竹笋 Ag-SiO 2-TiO 2 纳米包装袋 储藏品质
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Ag/SiO_2复合薄膜的紫外光还原制备及其光学性能 认领 引用 被引量：4
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作者 孙小飞 魏长平 +1 位作者 李启源 许洁 《无机化学学报》 SCIE CAS 北大核心 2008年第11期1895-1899,共5页
采用溶胶凝胶法(sol-gel)制备不同Ag掺杂量的Ag/SiO2复合薄膜,通过紫外辐射技术对薄膜进行了还原处理,采用XRD、SEM、IR、UV-Vis、Raman和荧光光谱(PL)等技术对薄膜样品结构进行了表征和光学性能测试。XRD结果表明,复合薄膜样品中的Ag... 采用溶胶凝胶法(sol-gel)制备不同Ag掺杂量的Ag/SiO2复合薄膜,通过紫外辐射技术对薄膜进行了还原处理,采用XRD、SEM、IR、UV-Vis、Raman和荧光光谱(PL)等技术对薄膜样品结构进行了表征和光学性能测试。XRD结果表明,复合薄膜样品中的Ag纳米粒子呈面心立方相,利用谢乐公式计算出金属银的平均晶粒尺寸约为10.2nm;SEM结果显示,所得Ag/SiO2复合薄膜均匀性良好,薄膜中绝大部分纳米颗粒尺寸较小,薄膜约厚1μm;UV-Vis结果表明,随着nAgSi的增加,Ag纳米粒子在420nm附近的表面等离子共振吸收峰逐渐增强,并伴有一定的红移;PL谱表明,由于Ag纳米粒子的表面等离子共振,薄膜样品在442nm处发出强光,并且随着Ag浓度增大,发光强度略有降低,出现蓝移;从Raman光谱可以看出由于Ag纳米颗粒表面局域电磁场增强造成的表面增强的拉曼散射(SERS)。 展开更多
关键词 Ag/SiO2 复合薄膜 紫外辐射 光学性能
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(Au,Ag,Cu)/SiO_2二元合金分散复合薄膜非线性光吸收的Mie理论模拟 认领 引用 被引量：3
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作者 严丽平 张波萍 +2 位作者 赵翠华 李顺 王士京 《无机化学学报》 SCIE CAS CSCD 北大核心 2011年第6期1105-1110,共6页
用修正的Mie理论,模拟计算分析了(Ag,Cu)/SiO2、(Au,Cu)/SiO2、(Ag,Au)/SiO2合金纳米颗粒分散体系的理论吸收光谱。研究发现当二元金属纳米颗粒以合金形式存在时,在一个波段处出现SPR吸收峰,峰位与合金组元的相对含量相关。模拟出的理... 用修正的Mie理论,模拟计算分析了(Ag,Cu)/SiO2、(Au,Cu)/SiO2、(Ag,Au)/SiO2合金纳米颗粒分散体系的理论吸收光谱。研究发现当二元金属纳米颗粒以合金形式存在时,在一个波段处出现SPR吸收峰,峰位与合金组元的相对含量相关。模拟出的理论吸收光谱与实验结果一致。 展开更多
关键词 Mie理论 (Ag,Cu)/SiO2 (Au,Cu)/SiO2和(Ag,Au)/SiO2二元合金复合薄膜 光吸收谱
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TiO_2-K_2SiO_3无机涂层对空间材料Ag的防护行为研究 认领 引用 被引量：3
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作者 张蕾 严川伟 +2 位作者 屈庆 童靖宇 曹楚南 《化学学报》 SCIE CAS 北大核心 2003年第9期1369-1374,共6页
在微波电离型原子氧 (AO)源地面模拟设备中对空间材料Ag及TiO2 K2 SiO3 无机涂层进行原子氧剥蚀效应试验 .用扫描电镜 (SEM)、光电子能谱 (XPS)、红外光谱 (FT IR)、X射线衍射光谱 (XRD)和LAMBDA 9分光光度计 ,对在模拟原子氧(AO)环境... 在微波电离型原子氧 (AO)源地面模拟设备中对空间材料Ag及TiO2 K2 SiO3 无机涂层进行原子氧剥蚀效应试验 .用扫描电镜 (SEM)、光电子能谱 (XPS)、红外光谱 (FT IR)、X射线衍射光谱 (XRD)和LAMBDA 9分光光度计 ,对在模拟原子氧(AO)环境中Ag及在其表面涂覆的无机涂层 ,所发生的侵蚀与防护作用进行了表征研究 .AO对Ag表现了较严重的侵蚀作用 ,原来光亮如镜的表面形貌变得粗糙 ,且失去光泽 .而所施用的TiO2 K2 SiO3 无机涂层 ,经AO辐照后 ,表面形貌则变化甚少 .实验表明 ,该涂层对AO辐照有较强的防护效果、较好的空间稳定性 (AO辐照前后Δαs≈ 0 .0 2 4) ,能阻止AO对基材的侵蚀 . 展开更多
关键词 TiO2-K2SiO3 无机涂层 空间材料 Ag 防护行为 原子氧 侵蚀 银 空间稳定性
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