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题名: Dynamic transformation of active components in Cu-ZnO-Al2O3 catalyst for methanol synthesis at high temperature
作者: Ma, HT;  Deng, GC;  Bao, XH
关键词: methanol synthesis ;  copper ;  zinc oxide ;  alumina ;  supported catalyst ;  growth of crystal grain ;  active component ;  migration
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2001-05-01
卷: 22, 期:3, 页:259-262
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The dynamic transformation of active components in the Cu-ZnO-Al2O3 catalyst for methanol synthesis during the calcination, reduction and reaction was investigated by XRD and XPS methods. The results showed that, when the catalyst was calcined in air, the particle size of the components increases with increasing calcination temperature, ZnO crystal grain grows faster than CuO crystal grain and aggregates on the surface of the catalyst, resulting in a decrease of the surface Cu/Zn ratio. During the reduction and reaction, the decrease in surface free energy of Cu crystal grain due to the interaction between hydrogen and CU particle is more than that of ZnO crystal grain, which is favorable for growth of the Cu crystal grain. The lower melting point of Cu makes the Cu particles own a lower activation energy of surface migration and a higher surface diffusion coefficient, therefore the growth of the Cu crystal grain controlled by surface diffusion is faster. But the ZnO crystal grain grows slower in the reducing atmosphere because of its higher melting point. In comparison with the calcined catalyst, the surface Cu/Zn ratio of the catalyst after reduction and reaction increases obviously.
语种: 英语
WOS记录号: WOS:000170359300013
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139025
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Nankai Univ, Dept Chem, Tianjin 300071, Peoples R China

Recommended Citation:
Ma, HT,Deng, GC,Bao, XH. Dynamic transformation of active components in Cu-ZnO-Al2O3 catalyst for methanol synthesis at high temperature[J]. CHINESE JOURNAL OF CATALYSIS,2001,22(3):259-262.
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