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题名: A highly active bimetallic supported Rh-Co hydroformylation catalyst prepared from RhCl3 and Co-2(CO)(8)
作者: Huang, L;  Xu, Y
关键词: RhCl3 ;  Co-2(CO)(8) ;  SiO2 ;  surface-bonded Rh+(CO)(2) ;  highly active Rh-Co catalyst ;  hydroformylation
刊名: CATALYSIS LETTERS
发表日期: 1998
卷: 55, 期:3-4, 页:227-234
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
英文摘要: The preparation of a highly active bimetallic SiO2-supported Rh-Co catalyst from RhCl3 and Co-2(CO)(8) (Rh:Co = 1:3 atomic ratio) has been studied by IR spectroscopy and ethylene hydroformylation, etc. Two steps are involved in the preparative process: (1) surface-mediated synthesis of Rh+(CO)(2)/SiO2 from calcined RhCl3/SiO2; (2) impregnation of Rh+(CO)(2)/SiO2 with a Co-2(CO)(8) solution followed by H-2 reduction at 623 K. The IR results of reductive carbonylation of calcined RhCl3/SiO2 have been compared to those of uncalcined RhCl3/SiO2 at 373 K. In situ IR observations, extraction results and elemental analysis suggest that approximately 50% of RhCl3 are transformed to Rh2O3 On the SiO2 surface and that calcined RhCl3/SiO2 is converted to a mixture of [Rh(CO)(2)Cl](2) and [Rh(CO)(2)O-s](2) (O-s: surface oxygen) under CO at 373 K. When this SiO2-supported mixture was submitted to impregnation with a Co-2(CO)(8) solution at room temperature, IR study and elemental analysis show that [Rh(CO)(2)Cl](2) reacts easily with Co-2(CO)(8) on the surface to give RhCo3(CO)(12), whereas [Rh(CO)(2)O-s](2) does not react with Co-2(CO)(8). Catalytic study in steady-state ethylene hydroformylation shows that a catalyst thus derived is more active than a catalyst derived from RhCo3(CO)(12)/SiO2 and a catalyst derived by coimpregnation of [Rh(CO)(2)Cl](2) and Co-2(CO)(8) On SiO2. This result suggests that the high rhodium dispersion of [Rh(CO)(2)O-s](2) plays a crucial role in the formation of highly dispersed bimetallic Rh-Co sites.
关键词[WOS]: REDUCTIVE CARBONYLATION ;  CHEMISORBED CO ;  REACTIVITY ;  RH6(CO)16 ;  RHODIUM ;  INSERTION ;  CHEMISTRY ;  RH+(CO)2 ;  CLUSTERS ;  IR
语种: 英语
WOS记录号: WOS:000077537200018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138484
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

Recommended Citation:
Huang, L,Xu, Y. A highly active bimetallic supported Rh-Co hydroformylation catalyst prepared from RhCl3 and Co-2(CO)(8)[J]. CATALYSIS LETTERS,1998,55(3-4):227-234.
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