Abstract
Temperature-programmed desorption (TPD) after methanol and formic acid adsorption and CO&z.sbnd;H 2 reaction were studied on palladium catalysts. No difference in the nature of the products after decomposition of methanol on 3% Pd/SiO 2 and 3% Pd/CeO 2 was found. Both catalysts decompose methanol into CO+H 2. After adsorption of formic acid on CeO 2 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/CeO 2 (methane was desorbed with a maximum at 545 K). Two peaks of methanol desorption were found after CO&z.sbnd;H 2 reaction on CeO 2 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;H 2 reaction on 3% Pd/CeO 2 gave results similar to those found after methanol adsorption. These results suggest that formyl species are involved in methanol synthesis on Pd/CeO 2 catalyst, whereas on CeO 2 formate species could be the main intermediate.
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