Chemisorption of H2 and Coadsorption of H2 and CO on Rh2Co2/Al2O3

Abstract

Abstract: The adsorption of H₂ as well as coadsorption of H₂ and COon Rh₂Co₂/Al₂O₃ catalyst has beenstudied using in situ FTIR dynamic method.The band at 1959 cm^-1 for Rh-H vibration on Rh₂Co₂/Al₂O₃ (w=3%) was observed and increased in intensity without shift to low wavenumber as H₂ coverageincrease.In the dynamic process of CO adsorption on Rh₂Co/Al₂O₃ preadsorbing H₂-TP(in H₂ and CO),the bands for the gem-dicarbonyl species, the linear COspecies and the bridge carbonyl species were lostand the bands for carbonyl hydrides were observed at 293 K.At about 473 K, the C-O bond of rhodiumcarbonyl hydrides starts to break down and CO hydrogenation reaction occurs.It can be concluded that thescission of C-O bond under the conditions of CO hydrogenation is via rhodium carbonyl hydrides.

Key words: Rh₂Co₂/Al₂O₃ catalyst, Adsorption of H₂, Coadsorption of CO and H₂, Carbonyl hydride, FTIR

CLC Number:

O643.322

TrendMD:

CHEN Yao-Qiang, GONG Mao-Chu, ZHU Xiao-Hong, MING Hong, TANG Shui-Hua. Chemisorption of H₂ and Coadsorption of H₂ and CO on Rh₂Co₂/Al₂O₃[J]. Chem. J. Chinese Universities, 2002, 23(4): 715.

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Chemisorption of H₂ and Coadsorption of H₂ and CO on Rh₂Co₂/Al₂O₃

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