Structure and catalytic activity of alumina-supported Pt-Co bimetallic catalysts. 2. Chemisorption and catalytic reactions

Làszlo Guczi, Tamàs Hoffer, Zoltàn Zsoldos, Souad Zyade, Gilbert Maire, Francois Garin

Research output: Contribution to journalArticle

83 Citations (Scopus)

Abstract

A series of Pt1-xCox/Al2O3 bimetallic catalysts have been characterized by temperature-programmed reduction (TPR), chemisorption of hydrogen and CO, deuterium exchange using both methanol and methane, and activity for the CO/H2 reaction. A Pt-assisted reduction mechanism over the entire range of composition was established by the TPR studies as well as by the chemisorption results. An enhanced metallic dispersion for the Pt-rich catalyst and formation of bimetallic particles on the Co-rich side was also indicated. In the CO hydrogenation over the Pt-rich catalysts the predominant products are methanol and dimethyl ether whereas on the Co-rich samples hydrocarbons and higher alcohols are produced. The mechanisms of deuterium exchange with methane and methanol are significantly different, the former being catalyzed solely by metallic sites while the latter utilizes both oxide and metallic sites for stepwise and multiple exchange, respectively. On the basis of the XPS data (preceding article) as well as the chemisorption results reported here, a surface model is introduced for interpretation of the catalytic results.

Original languageEnglish
Pages (from-to)802-808
Number of pages7
JournalJournal of physical chemistry
Volume95
Issue number2
DOIs
Publication statusPublished - 1991

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'Structure and catalytic activity of alumina-supported Pt-Co bimetallic catalysts. 2. Chemisorption and catalytic reactions'. Together they form a unique fingerprint.

  • Cite this