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FTIR study of Crotyl alcohol, Crotonaldehyde and Crotonic acid adsorption on the surface of the V/Zr oxide catalyst
Authors: Lochař Václav | Pytel Martin
Year: 2006
Type of publication: článek v odborném periodiku
Name of source: Scientific Papers of the University of Pardubice, Series A, Faculty of Chemical Technology
Publisher name: Univerzita Pardubice
Place: Pardubice
Page from-to: 71-79
Titles:
Language Name Abstract Keywords
cze FTIR studie adsorpce krotylalkoholu, krotonaldehydu a kyseliny krotonové na povrchu V/Zr oxidovém katalyzátoru Byla studována Ič spectra adsorpce krotylalkoholu, krotonaldehydu a kyseliny krotonové na V/Zr oxidovém katalyzátoru za účelem identifikace meziproduktů oxidativní dehydrogenace krotonaldehydu na anhydrid kyseliny maleinové. Krotylalkohol se vyskytuje na povrchu výše zminovaného systému převážně ve formě alkoxidu, který je oxidován na krotonaldehyd a následně na kyselinu krotonovou. Vposledním kroku dochází k transformaci karboxylátu na anhydrid kyseliny maleinové. Na základě analýzy specter po adsorpci kyseliny krotonové byla dokázána přítomnost dvou odlišných karboxylátů a to kyseliny krotonové a maleinové. FTIR spektroskopie, V-Zr oxidové katalyzátory, krotylalkohol, krotonaldehyd
eng FTIR study of Crotyl alcohol, Crotonaldehyde and Crotonic acid adsorption on the surface of the V/Zr oxide catalyst Infrared studies of crotyl alcohol (2-butene-1-ol), crotonaldehyde (2-butenal) and crotonic acid (2-butenoic acid) adsorption were carried out on ZrO2 - supported vanadium catalyst. The results were used to analyze the surface intermediates of crotonaldehyde dehydrogenation to maleic anhydride. Crotyl alcohol was adsorbed mainly in the alkoxide form, which is oxidized to crotonaldehyde and consecutively to crotonic acid. Final step in crotyl alcohol adsorption on V2O5-ZrO2 catalyst is the conversion of carboxylate species into maleic anhydride. The reaction of adsorbed crotonaldehyde and the oxygen atom of the catalyst resulted in the formation of carboxylate at higher temperature. The presence of two different surface carboxylate species (maleate and crotonate) was shown from IR spectra following crotonic acid adsorption. As distinct from the crotyl alcohol adsorption, the presence of surface maleic anhydride after adsorption of crotonic acid, respectively crotonaldehyde on V2O5-ZrO2 catalyst was not shown. FTIR spectroscopy, V-Zr oxide catalysts, Crotyl alcohol, Crotonaldehyde

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