RATE－DETERMINING　STEP　IN　OLEFIN　HYDROFORMYLATION　OVER　SUPPORTED　AQUEOUS－PHASE　CATALYSTS  

作　　者：You Zhu YUAN Yi Quan YANG Jin Lai XU Hong Bin ZHANG and Khi Rui TSAI(Deportment of Chemistry Institute of Physical Chemistry Xiamen University Xiamen 361005) 

出　　处：《Chinese Chemical Letters》1994年第4期291-294,共4页中国化学快报（英文版）

摘　　要：A series of olefin hydroformylations over supported aqueous-phase rhodium catalyst with the substitUtion of CO/D2 for CO/H2 were cAned out to study the isotope effects of deuterium. The rate of aldehyde formation in CO/D2 was about 1.3 times faster than that in COns2, indicating that the aldehyde formation shows noticeable inverse deuterium isotope effect over SAP catalyst. The results of in-situIR stUdy of ethylene hydroformylation suggest that the reaction rate of acylhydrogenolysis forming aldehyde is the slowest one. It may be inferred from these results that the rate-determining step involved\in aldehyde formation is very probably astep ofhydrogenation.A series of olefin hydroformylations over supported aqueous-phase rhodium catalyst with the substitUtion of CO/D2 for CO/H2 were cAned out to study the isotope effects of deuterium. The rate of aldehyde formation in CO/D2 was about 1.3 times faster than that in COns2, indicating that the aldehyde formation shows noticeable inverse deuterium isotope effect over SAP catalyst. The results of in-situIR stUdy of ethylene hydroformylation suggest that the reaction rate of acylhydrogenolysis forming aldehyde is the slowest one. It may be inferred from these results that the rate-determining step involved\in aldehyde formation is very probably astep ofhydrogenation.

关 键 词：STEP DETERMINING OLEFIN HYDROFORMYLATION CATALYSTS AQUEOUS 

分 类 号：O643.36[理学—物理化学]