Hydrogenation of 1-Butene and 1,3-Butadiene Mixtures over Pd/ZnO Catalysts

A. Sárkány, Z. Zsoldos, B. Furlong, J. W. Hightower, L. Guczi

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

Several palladium catalysts supported on ZnO with different loadings and dispersions have been prepared, characterized, pretreated, and tested for the selective hydrogenation of small amounts of 1,3-butadiene in 1-butene. Hydrogen treatment at temperatures above 423 K caused a marked decrease in catalytic activity and a simultaneous increase in selectivity for reduction of butadiene primarily to olefins. Such treatment also caused partial reduction of the ZnO support which resulted in the formation of PdZn intermetallic phases (XRD results). XPS measurements suggested that the Pd crystallites were "decorated" with reduced Zn metal which significantly decreased the availability of the Pd adsorption sites, as determined by hydrogen and carbon monoxide chemisorption. Alternate oxidation and temperature-programmed reduction cycles could distinguish between the formation of (PdO)S and oxidation of the reduced Zn. Even though the overall activity was decreased after high-temperature exposure to hydrogen, the turnover frequency for the smaller number of active sites remained virtually unchanged. Moreover, the activation energy and reaction orders were not altered. High-temperature reduction also decreased the trans/cis-2-butene ratio formed from the butadiene: this may reflect slow interconversion between the syn and anti conformation of the 1,3-butadiene adsorbed on the Zn-decorated surface. These experiments have identified some of the important roles of the support and pretreatment conditions on the performance of such catalysts.

Original languageEnglish
Pages (from-to)566-582
Number of pages17
JournalJournal of Catalysis
Volume141
Issue number2
DOIs
Publication statusPublished - Jun 1993

Fingerprint

butenes
butadiene
Butadiene
Butenes
Hydrogenation
hydrogenation
catalysts
Hydrogen
Catalysts
hydrogen
Oxidation
Temperature
oxidation
Catalyst selectivity
Palladium
Alkenes
Carbon Monoxide
Chemisorption
Dispersions
Crystallites

ASJC Scopus subject areas

  • Process Chemistry and Technology
  • Catalysis

Cite this

Hydrogenation of 1-Butene and 1,3-Butadiene Mixtures over Pd/ZnO Catalysts. / Sárkány, A.; Zsoldos, Z.; Furlong, B.; Hightower, J. W.; Guczi, L.

In: Journal of Catalysis, Vol. 141, No. 2, 06.1993, p. 566-582.

Research output: Contribution to journalArticle

Sárkány, A. ; Zsoldos, Z. ; Furlong, B. ; Hightower, J. W. ; Guczi, L. / Hydrogenation of 1-Butene and 1,3-Butadiene Mixtures over Pd/ZnO Catalysts. In: Journal of Catalysis. 1993 ; Vol. 141, No. 2. pp. 566-582.
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