Dissociation of CO and H2O during water–gas shift reaction on carburized Mo/Al2O3 catalyst
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説明
Abstract The dissociation of CO and H 2 O during the water–gas shift reaction (WGSR) on the 973 K-carburized 4.8 and 8.5 wt% Mo/Al 2 O 3 catalysts at 423 K was studied by in situ mass and infrared spectroscopies. It was found that both CO and H 2 O were dissociated on the basis of the formation of H 2 , 13 C 18 O, 13 C 18 O 2 and 13 C 18 O 16 O after the injection of H 2 18 O into the 13 C 16 O stream. Regarding the 12 C- and 16 O-labeled atoms, 12 C 16 O 2 , 12 C 16 O 18 O and 12 C 18 O 2 were not formed, but H 2 16 O, 12 C 16 O, 12 C 18 O and 13 C 16 O 2 were formed. The H 2 16 O, 12 C 16 O and 13 C 16 O 2 were formed by the reaction of the dissociated 16 O of 13 C 16 O with the surface carbon or the lattice carbon atom of the Mo oxycarbide. The infrared spectroscopy results for the injection of H 2 O into the C 18 O flow showed that C 18 O had no effect on forming the formate group. The formate and carbonate which were probably formed during the CO 2 hydrogenation were observed when using the 973 K-carburized Mo/Al 2 O 3 catalyst and alumina in a stream of CO. The WGSR on the Mo oxycarbide of the carburized Mo/Al 2 O 3 catalyst followed the redox route together with the dissociation-association mechanism.
収録刊行物
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- Applied Catalysis A: General
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Applied Catalysis A: General 398 (1-2), 155-160, 2011-05
Elsevier BV