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Hydrogenation of methyl acetate to ethanol over a highly stable Cu/SiO2 catalyst: Reaction mechanism and structural evolution
Huang, Xiumin1; Ma, Meng1; Miao, Shu1; Zheng, Yanping2; Chen, Mingshu2; Shen, Wenjie1
关键词Cu/sio2 Catalyst Core-shell Structure Methyl Acetate Hydrogenation Stability
刊名APPLIED CATALYSIS A-GENERAL
2017-02-05
DOI10.1016/j.apcata.2016.12.006
531页:79-88
收录类别SCI
文章类型Article
WOS标题词Science & Technology ; Physical Sciences ; Life Sciences & Biomedicine
类目[WOS]Chemistry, Physical ; Environmental Sciences
研究领域[WOS]Chemistry ; Environmental Sciences & Ecology
关键词[WOS]DIMETHYL ETHER CARBONYLATION ; PRECIPITATION-GEL METHOD ; SILICA-SUPPORTED COPPER ; GLYCEROL HYDROGENOLYSIS ; ETHYLENE-GLYCOL ; H-MORDENITE ; CHEMOSELECTIVE HYDROGENATION ; ACIDIC ZEOLITES ; OXALATE ; PERFORMANCE
英文摘要A Cu/SiO2 catalyst with a core-shell structure was found to be highly active and stable for the hydrogenation of methyl acetate to ethanol during 96 h reaction test at 523 K; MA conversion reached at 95% while the selectivity towards the major products (ethanol and methanol) approached similar to 95%. Structural analysis revealed that most copper particles in the hydrogen-reduced Cu/SiO2 catalyst had sizes of 3-7 nm and were coated with a thin layer of silica, forming a core-shell structure. The average size of copper particles and the core-shell structure kept unchanged in the spent catalyst, but the Cu+/(Cu-0 + Cu+) ratio increased during the course of reaction, probably because of the electronic interaction between copper surface and methyl acetate under the reaction conditions. Mechanistic and kinetic studies have identified that ethyl acetate was formed through trans-esterification of initially produced ethanol with methyl acetate, while the subsequent hydrogenation of ethyl acetate to ethanol proceeded much faster. The Cu+/(Cu-0 + Cu+) ratio played a crucial role in reaction network; MA could adsorb equally on Cu-0 and Cu+ sites while the activation of molecular hydrogen occurs only on the Cu-0 site. Therefore, a rather stable performance could be attained with the increase in the Cu+/(Cu-0 + Cu+) ratio during the course of reaction as long as the reaction is kinetically controlled by MA adsorption. The outstanding stability of the Cu/SiO2 catalyst was ascribed to a combination of geometric and electronic effect. (C) 2016 Elsevier B.V. All rights reserved.
语种英语
WOS记录号WOS:000392680500010
引用统计
被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/151883
专题中国科学院大连化学物理研究所
作者单位1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China
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Huang, Xiumin,Ma, Meng,Miao, Shu,et al. Hydrogenation of methyl acetate to ethanol over a highly stable Cu/SiO2 catalyst: Reaction mechanism and structural evolution[J]. APPLIED CATALYSIS A-GENERAL,2017,531:79-88.
APA Huang, Xiumin,Ma, Meng,Miao, Shu,Zheng, Yanping,Chen, Mingshu,&Shen, Wenjie.(2017).Hydrogenation of methyl acetate to ethanol over a highly stable Cu/SiO2 catalyst: Reaction mechanism and structural evolution.APPLIED CATALYSIS A-GENERAL,531,79-88.
MLA Huang, Xiumin,et al."Hydrogenation of methyl acetate to ethanol over a highly stable Cu/SiO2 catalyst: Reaction mechanism and structural evolution".APPLIED CATALYSIS A-GENERAL 531(2017):79-88.
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