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Ag/SiO_2-ZnO-CeO_2催化剂上甘油与苯胺液固相高效催化合成3-甲基吲哚 认领 引用
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作者 石雷 杜秀芳 +2 位作者 任丽婷 郝文文 赵丹 《辽宁师范大学学报（自然科学版）》 CAS 2018年第3期345-352,共8页
3-甲基吲哚作为一种应用极广的氮杂环化合物,可以合成许多在工、农、医等领域有重要用途的化学品.以生物柴油副产物甘油为主要原料与苯胺反应合成3-甲基吲哚是目前最理想的合成方法,不仅价格低廉,而且绿色环保.以Ag/SiO_2为催化剂,向其... 3-甲基吲哚作为一种应用极广的氮杂环化合物,可以合成许多在工、农、医等领域有重要用途的化学品.以生物柴油副产物甘油为主要原料与苯胺反应合成3-甲基吲哚是目前最理想的合成方法,不仅价格低廉,而且绿色环保.以Ag/SiO_2为催化剂,向其添加ZnO及CeO_2助剂,在不锈钢高压反应釜中通过液固相反应一锅高效催化合成3-甲基吲哚,通过H2程序升温还原、X射线粉末衍射、透射电镜、NH3程序升温脱附和热重等手段对催化剂进行表征.结果表明:加入ZnO助剂能增强活性组分银与SiO_2载体的相互作用,有效提高银在SiO_2-ZnO表面的分散度,并抑制银粒子在反应过程中的烧结.CeO_2助剂的加入能在一定程度上减弱催化剂的中强酸酸性,从而抑制反应过程中积碳的形成.当ZnO和CeO_2助剂含量分别为1.00和0.04mmol/g时,Ag/SiO_2-ZnO-CeO_2催化剂表现出很高的催化性能,反应16h,3-甲基吲哚的收率可以达到70%.该催化剂重复使用5次,其目标产物收率尚能达到63%. 展开更多
关键词 3-甲基吲哚 Ag/SiO2-ZnO-CeO2催化剂 甘油 苯胺 液固相催化反应
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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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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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ZnO对Ag/SiO_2催化剂银的分散作用及对吲哚合成稳定性的影响 认领 引用 被引量：7
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作者 石雷 孙仁安 +1 位作者 蔡天锡 王新平 《高等学校化学学报》 SCIE EI CAS 北大核心 2004年第1期108-110,113,共3页
将 Zn O助剂加到由苯胺和乙二醇一步合成吲哚的 Ag/ Si O2 催化剂中 ,发现 Zn O助剂能大大提高催化剂的稳定性 .XRD和 TEM表征首次得到 :Zn O是结构型助剂 ,它能使银很好地分散在 Si O2 表面上 ,并可有效地抑制反应过程中银粒子的烧结 .
关键词 ZnO Ag/SiO2 催化剂 银 分散作用 吲哚 合成 稳定性 催化性能 二氧化硅 氧化锌
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Characterization and catalytic performance of CeO_2-Co/SiO_2 catalyst for Fischer-Tropsch synthesis using nitrogen-diluted synthesis gas over a laboratory scale fixed-bed reactor 认领 引用 被引量：2
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作者 Xiaoping Dai Changchun Yu 《Journal of Natural Gas Chemistry》 2008年第1期17-23,共7页
The surface species of CO hydrogenation on CeO2-Co/SiO2 catalyst were investigated using the techniques of temperature programmed reaction and transient response method. The results indicated that the formation of H2O... The surface species of CO hydrogenation on CeO2-Co/SiO2 catalyst were investigated using the techniques of temperature programmed reaction and transient response method. The results indicated that the formation of H2O and CO2 was the competitive reaction for the surface oxygen species, CH4 was produced via the hydrogenation of carbon species step by step, and C2 products were formed by the polymerization of surface-active carbon species （-CH2-）. Hydrogen assisted the dissociation of CO. The hydrogenation of surface carbon species was the rate-limiting step in the hydrogenation of CO over CeO2-Co/SiO2 catalyst. The investigation of total pressure, gas hourly space velocity （GHSV）, and product distribution using nitrogen-rich synthesis gas as feedstock over a laboratory scale fixed-bed reactor indicated that total pressure and GHSV had a significant effect on the catalytic performance of CeO2-Co/SiO2 catalyst. The removal of heat and control of the reaction temperature were extremely critical steps, which required lower GHSV and appropriate CO conversion to avoid the deactivation of the catalyst. The feedstock of nitrogen-rich synthesis gas was favorable to increase the conversion of CO, but there was a shift of product distribution toward the light hydrocarbon. The nitrogen-rich synthesis gas was feasible for F-T synthesis for the utilization of remote natural gas. 展开更多
关键词 CeO2-Co/SiO2 catalyst Fischer-Tropsch synthesis surface species reaction condition nitrogen-rich synthesis gas product distribution
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Synthesis of Ultraviolet Absorber Benzotriazole by Nanoparticles Ag/SiO_2 Catalytic Hydrogenation 认领 引用 被引量：1
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作者 祁刚 张文国 戴勇 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2012年第12期1810-1814,共5页
The Ag/SiO2 nanoparticles had been successfully synthesized. The Ag/SiO2 nano- particles can be an excellent catalyst for the synthesis of ultraviolet absorber benzotriazole by catalytic hydrogenation. The synthesis r... The Ag/SiO2 nanoparticles had been successfully synthesized. The Ag/SiO2 nano- particles can be an excellent catalyst for the synthesis of ultraviolet absorber benzotriazole by catalytic hydrogenation. The synthesis route is very efficient with less pollution and excellent yields. It is also easy to industrialized production. 展开更多
关键词 Ag/SiO2 nanoparticles catalyst benzotriazole
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Stability of Ag@SiO2 core–shell particles in conditions of photocatalytic overall water-splitting 认领 引用 被引量：2
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作者 Sun-Young Park Kai Han +1 位作者 Devin B.O’Neill Guido Mul 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2017年第2期309-314,共6页
Core–shell nanoparticles containing plasmonic metals（Ag or Au） have been frequently reported to enhance performance of photo-electrochemical（PEC） devices. However, the stability of these particles in water-splitt... Core–shell nanoparticles containing plasmonic metals（Ag or Au） have been frequently reported to enhance performance of photo-electrochemical（PEC） devices. However, the stability of these particles in water-splitting conditions is usually not addressed. In this study we demonstrate that Ag@SiOcore–shell particles are instable in the acidic conditions in which WO-based PEC cells typically operate, Ag in the core being prone to oxidation, even if the SiOshell has a thickness in the order of 10 nm. This is evident from in situ voltammetry studies of several anode composites. Similar to the results of the PEC experiments, the Ag@SiOcore–shell particles are instable in slurry-based, Pt/ZnO induced photocatalytic water-splitting. This was evidenced by in situ photodeposition of Ag nanoparticles on the Pt-loaded ZnO catalyst, observed in TEM micrographs obtained after reaction. We explain the instability of Ag@SiOby OH-radical induced oxidation of Ag, yielding dissolved Ag+. Our results imply that a decrease in shell permeability for OH-radicals is necessary to obtain stable, Ag-based plasmonic entities in photo-electrochemical and photocatalytic water splitting. 展开更多
关键词 Photocatalysis Photoelectrochemistry Water-splitting Plasmon Stability Ag SiO2 Core–Shell WO3 ZnO Mechanism
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Preparation of Cu/ZnO/Al2O3 catalyst under microwave irradiation for slurry methanol synthesis 认领 引用 被引量：1
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作者 Hui FAN Huayan ZHENG Zhong LI 《Frontiers of Chemical Science and Engineering》 2010年第4期445-451,共7页
Cu/ZnO/Al2O3 catalysts with Cu/Zn/Al ratios of 6/3/1 were precipitated and aged by conventional and microwave heating methods and tested in the slurry phase reactor for methanol synthesis.The effect of technolog... Cu/ZnO/Al2O3 catalysts with Cu/Zn/Al ratios of 6/3/1 were precipitated and aged by conventional and microwave heating methods and tested in the slurry phase reactor for methanol synthesis.The effect of technological condition of precipitation and aging process under microwave irradiation on the catalytic performance was investigated to optimize the preparing condition of Cu/ZnO/Al2O3 catalyst.The results showed that the microwave irradiation during precipitation process could improve the activity of the catalyst,but had little effect on the stability.While the microwave irradiation during aging process has a great benefit to both the activity and stability of the catalyst,the catalyst aged at 80℃ for 1 h under microwave irradiation possessed higher methanol space time yield(STY)and more stable catalytic activity.The activity and stability of the catalyst was further enhanced when microwave irradiation was used in both precipitation and aging processes;the optimized condition for the catalyst precursor preparation was precipitation at 60℃ and aging at 80℃ under microwave irradiation. 展开更多
关键词 microwave irradiation precipitation temperature aging temperature methanol synthesis Cu/ZnO/Al2O3catalyst
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高分散纳米银催化剂一锅高效催化生物质基甘油和苯胺合成3-甲基吲哚 认领 引用
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作者 郝文文 赵丹 +3 位作者 李延春 楚文玲 吕成伟 石雷 《应用化学》 CAS CSCD 北大核心 2019年第4期465-473,共9页
将ZnO改性的高分散纳米银催化剂(Ag/SiO_2-ZnO)成功地用于生物质基甘油与苯胺一锅高效合成3-甲基吲哚的反应中。通过X射线衍射(XRD)、透射电子显微镜(TEM)、氢气程序升温还原(H_2-TPR)、氨气和二氧化碳程序升温脱附(NH_3-TPD或CO_2-TPD... 将ZnO改性的高分散纳米银催化剂(Ag/SiO_2-ZnO)成功地用于生物质基甘油与苯胺一锅高效合成3-甲基吲哚的反应中。通过X射线衍射(XRD)、透射电子显微镜(TEM)、氢气程序升温还原(H_2-TPR)、氨气和二氧化碳程序升温脱附(NH_3-TPD或CO_2-TPD)、热重(TG)分析和电感耦合等离子体(ICP)发射光谱技术手段研究了银基催化剂的结构和性能。结果表明,向Ag/SiO_2-ZnO催化剂加入ZnO助剂能增强银与载体之间的相互作用,使银粒子可以牢固地锚定在SiO_2-ZnO载体上,不仅提高了银的分散度,而且有效抑制了反应过程中银纳米粒子的聚集或烧结。此外,ZnO还能显著增加银基催化剂的酸性位点及碱性位点,这对甘油氢解生成1,2-丙二醇非常有利,明显促进了3-甲基吲哚的合成。反应16 h,3-甲基吲哚收率高达64%,催化剂重复使用4次,收率仅降低4%。另外,提出了甘油和苯胺在Ag/SiO_2-ZnO催化剂上合成3-甲基吲哚的机理,其中1,2-丙二醇是制备3-甲基吲哚的中间体。 展开更多
关键词 ZnO Ag/SiO2 3-甲基吲哚 生物质基甘油 催化性能
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