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Characterization of Rh-based catalysts with EPR, TPR, IR and XPS
Wang, Y; Song, Z; Ma, D; Luo, HY; Liang, DB; Bao, XH
关键词Characterization Rh Catalyst Epr Tpr Ir Xps
刊名JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
1999-12-15
149期:1-2页:51-61
收录类别SCI
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Chemistry, Physical
研究领域[WOS]Chemistry
关键词[WOS]SUPPORTED RHODIUM CATALYSTS ; CO HYDROGENATION ; PROMOTED RHODIUM ; SYNGAS ; ACETALDEHYDE ; MANGANESE ; PRESSURE ; RHMN/NAY ; MN
英文摘要Rh-based catalysts to be used for the synthesis of C-2-oxygenates from syngas were characterized with EPR, TPR, IR and XPS methods. The chemical state of the Mn component was extensively studied with EPR after in situ reduction and treatment with various probe molecules. The results indicated that on the Mn/SiO2 catalyst, Mn can exist as isolated Mn2+ ions on the surface of SiO2 through the formation of coordination compounds with surface hydroxyls and H2O molecules as ligands. Thermal reduction of the Mn/SiO2 catalyst resulted in the migration and accumulation of the Mn2+ ions. The results of TPR, IR, XPS were consistent with those of EPR, which indicated that on a Rh-Mn/SiO2 catalyst, a Rh-Mn mixed oxide was formed, which stabilized the Rh+ species. The formation of small clusters of the Rh-Mn mixed oxide inhibited deep reduction and accumulation of the Mn component, while at the same time increased the dispersion of the Rh component. As a promoter, Mn acts as an electron acceptor, while Li exhibits an electron-donation effect. The Li component can inhibit the formation of Rh-Mn mixed oxide and increase the concentration of Rh-0 on the surface of SiO2. The existence of Li may also cause the tilted-adsorption form of CO on Rh, as well as the spillover of H-2 from Rh to the SiO2 support. (C) 1999 Elsevier Science B.V. All rights reserved.
语种英语
WOS记录号WOS:000084148900006
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被引频次:47[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/321008/138210
专题中国科学院大连化学物理研究所
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
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GB/T 7714
Wang, Y,Song, Z,Ma, D,et al. Characterization of Rh-based catalysts with EPR, TPR, IR and XPS[J]. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,1999,149(1-2):51-61.
APA Wang, Y,Song, Z,Ma, D,Luo, HY,Liang, DB,&Bao, XH.(1999).Characterization of Rh-based catalysts with EPR, TPR, IR and XPS.JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,149(1-2),51-61.
MLA Wang, Y,et al."Characterization of Rh-based catalysts with EPR, TPR, IR and XPS".JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL 149.1-2(1999):51-61.
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