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Temperature-programmed desorption studies on Pd/CeO2 after methanol and formic acid adsorption and carbon monoxide—hydrogen reaction

Temperature-programmed desorption (TPD) after methanol and formic acid adsorption and CO&z.sbnd;H2 reaction were studied on palladium catalysts. No difference in the nature of the products after decomposition of methanol on 3% Pd/SiO2 and 3% Pd/CeO2 was found. Both catalysts decompose methanol into CO+H2. After adsorption of formic acid on CeO2 alone, methanol was desorbed with a maximum at 540–550 K. This result can be interpreted by possible hydrogenation of formate species into methanol. On the other hand, no methanol was observed after adsorption of formic acid on 3% Pd/CeO2 (methane was desorbed with a maximum at 545 K). Two peaks of methanol desorption were found after CO&z.sbnd;H2 reaction on CeO2 at 383 and 535 K. The first could be formed after methoxy hydrogenation and the second may be due to hydrogenation of formate species. TPD after CO&z.sbnd;H2 reaction on 3% Pd/CeO2 gave results similar to those found after methanol adsorption. These results suggest that formyl species are involved in methanol synthesis on Pd/CeO2 catalyst, whereas on CeO2 formate species could be the main intermediate.

Auteur(s) : C. Diagne, H. Idriss, I. Pepin, J.P. Hindermann, A. Kiennemann
Pages : 43-53
Année de publication : 1989
Revue : Applied Catalysis
N° de volume : 50
Type : Article
Mise en ligne par : DIAGNE Cheikh Talibouya