ETHENE HYDROGENATION OVER SILICA-SUPPORTED RU AND RU-CU BIMETALLIC CATALYSTS - THE ROLE OF DEFECTS AND SPECIAL SITES

被引:11
作者
BHATIA, S
WU, X
SANDERS, DK
GERSTEIN, BC
PRUSKI, M
KING, TS
机构
[1] IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011
[2] IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM ENGN,AMES,IA 50011
关键词
D O I
10.1016/0920-5861(92)85038-N
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
H-1 NMR of chemisorbed hydrogen and solid state C-13 NMR were used to investigate ethene hydrogenation and decomposition on Ru/SiO2 and Ru-Cu/SiO2 catalysts. H-1 NMR results on Ru/SiO2 catalysts indicate that the weakly adsorbed hydrogen is more concentrated on defect-like Ru sites, and it is suggested to be thermodynamically more accessible than strongly adsorbed hydrogen for ethene hydrogenation under typical reaction conditions. Results from H-1 NMR also indicate that addition of Cu reduces the amount of the weakly bound hydrogen. Addition of Cu to Ru/SiO2 catalysts suppresses the activity of ethene hydrogenation as observed by C-13 NMR. This effect may be due to preferential population of defect-like edge and comer Ru sites by Cu, subsequently limiting the amount of the weakly bound hydrogen on the metal surfaces necessary for ethene hydrogenation.
引用
收藏
页码:165 / 175
页数:11
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