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Hydrogen adsorption sites studied by carbon monoxide adsorption to explain the hydrogenation activity of benzene on Pd and Pt catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
44260 46011 2006 7 PDF Available
Title
Hydrogen adsorption sites studied by carbon monoxide adsorption to explain the hydrogenation activity of benzene on Pd and Pt catalysts
Abstract

FT-IR of CO has been employed to study the relations between hydrogen adsorption and benzene hydrogenation on Pd/SiO2 and Pt/SiO2 catalysts. Three IR bands of CO stretching: 2085 (L1 band), 1984 (B1 band) and 1948 cm−1 (B2 band), have been observed on Pd/SiO2. Hydrogenation of benzene is dominated by hydrogen adsorption on B1 sites (CO band at 1984 cm−1) of Pd/SiO2, because benzene and/or the benzene ring of acetophenone can preferentially cover on the B1 sites to hinder hydrogen adsorption, leading to poor catalytic activity for hydrogenation of benzene. When hydrogen is pre-covered on Pd/SiO2 to occupy the B1 sites, it will cause intense benzene hydrogenation. Pre-adsorbed acetophenone on Pt/SiO2 surface presents a surprising phenomenon that adsorbed acetophenone does not impede CO adsorption. We propose that adsorption of hydrogen is independent of the exposure of pre-adsorbed acetophenone, and therefore Pt/SiO2 catalyst can offer high catalytic activity for hydrogenation of benzene.

Keywords
Benzene hydrogenation; Palladium; Platinum; CO adsorption; IR spectra
First Page Preview
Hydrogen adsorption sites studied by carbon monoxide adsorption to explain the hydrogenation activity of benzene on Pd and Pt catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 298, 10 January 2006, Pages 161–167
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis