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Hydrogen Formation in Ethanol Reforming on Supported Noble Metal Catalysts by András Erdőhelyi; János Raskó; Tamara Kecskés; Mariann Tóth; Márta Dömök; Kornélia Baán is a Materials Science article available to read on EtoBox.

What is Hydrogen Formation in Ethanol Reforming on Supported Noble Metal Catalysts about?

The formation and stability of surface species generated in the interaction of ethanol and ethanol-water mixture with Al 2 O 3 and CeO 2supported noble metal catalysts were studied by FT-IR, TPD and TPR methods. It was found that water enhanced the stability of ethoxide surface species formed in the dissociation of ethanol. Dehydrogenation of molecularly adsorbed ethanol was proposed as a key reaction step. The TPD spectra of ethanol adsorbed on supported noble metals exhibited a high temperature desorption stage which was explained by the formation and decomposition of surface acetate species. Ethylene (product of the dehydration of ethanol) was mainly formed on Al 2 O 3 -supported noble metals, while on CeO 2 -supported noble metals significant amount of acetaldehyde (originated from the dehydrogenation of ethanol) was also formed. In the steam reforming of ethanol the selectivity of H 2 formation decreased but that of C 2 H 4 increased in time, while the conversions were stable on alumina-supported noble metals. These observations were explained by the inhibiting effect of surface acetate species.

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Author

András Erdőhelyi; János Raskó; Tamara Kecskés; Mariann Tóth; Márta Dömök; Kornélia Baán

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0920-5861)

Published

2006

Language

EN

Field

Materials Science (Physical Sciences)