Identification of the active sites in the selective hydrogenation of acetic acid to acetaldehyde on iron oxide catalysts

R. Pestman, R. M. Koster, E. Boellaard, A. M. van der Kraan, Vladimir Ponec

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Abstract

Iron-based catalysts appeared to be very active and selective in the hydrogenation of acetic acid to acetaldehyde. The active and selective catalyst consists of a metallic and an oxidic phase. Probably, the metal is needed to activate hydrogen, and the oxide is needed to provide the reaction site for the selective hydrogenation. Catalyst pretreatment and reaction conditions must be carefully controlled: the catalyst must be prereduced and the hydrogen/acid
ratio must be higher than four. Only then are both iron-containing phases formed and kept stable during the reaction. The function of hydrogen is twofold: it must keep the catalyst in its active, partly reduced, form and it acts as reactant in the hydrogenation of acetic acid.
Original languageEnglish
Article numberCA981957
Pages (from-to)142–152
Number of pages11
JournalJournal of Catalysis
Volume174
Issue number2
DOIs
Publication statusPublished - 1998
Externally publishedYes

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