Kinetic study on the effects of support on the catalytic performances of Rh/SiO/sub 2/, Rh/Al/sub 2/O/sub 3/, and Rh/TiO/sub 2/ in a CO-H/sub 2/ reaction

Journal Article · Tue Mar 01 04:00:00 EST 1988 · J. Catal.; (United States)

OSTI ID:5368324

Mochida, I; Ikeyama, N; Ishibashi, H; Fujitsu, H

The catalytic hydrogenation of CO with hydrogen over Rh/TiO/sub 2/, Rh/Al/sub 2/O/sub 3/, and Rh/SiO/sub 2/ reduced at 673 K was studied kinetically and by monitoring the behavior of adsorbed CO species with in situ FT-IR to reveal the origins of their markedly different activities. The higher activity of Rh/TiO/sub 2/ is related to the much higher reactivity of its irreversibly adsorbed CO against hydrogen. The reactivity of 17% of irreversibly adsorbed CO on Rh/Al/sub 2/O/sub 3/ was comparable to the rate of catalytic reaction, suggesting that its very limited portion is the reactive intermediate. The reactivity of the irreversibly adsorbed species on Rh/SiO/sub 2/ was much less, indicating that the reversibly adsorbed species is the reaction intermediate. The rate of carbon deposition and its reactivity against hydrogen were much less than the rate of catalytic reaction, ruling out a major contribution to the catalytic sequence. Thus, the extent of CO activation which is strongly influenced by the supports is the basis for providing markedly different activities for these catalysts.

• Research Organization: Kyushu Univ., Fukuoka (Japan)
• OSTI ID: 5368324
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 110:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

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010408* -- Coal
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