Title

Property of Pt–ag Alloy Nanoparticle Catalysts in Carbon Monoxide Oxidation

Document Type

Article

Publication Date

Fall 11-22-2014

Abstract

Alumina-supported platinum–silver alloy nanoparticle (Pt–Ag/Al2O3) catalysts with different particle composition have been prepared using a wet chemistry method and studied for the property in carbon monoxide oxidation reaction. The Pt–Ag alloy catalyst exhibits significantly improved activity and largely decreased activation energy barrier compared to those of both pure Pt and pure Ag catalysts in the room temperature range. The Langmuir–Hinshelwood mechanism, in which surface Pt active sites chemisorb CO and adjacent Ag sites activate O2, was proposed and discussed to explain the promoted CO oxidation kinetics on the Pt–Ag alloy. Thermal stability of the Pt–Ag alloy catalyst under the reaction condition was also investigated using in situ Fourier transform infrared spectroscopy experiments and transmission electron microscopy characterizations.

Publication Title

The Journal of Physical Chemistry

Volume

118

Issue

49

First Page

28739

Last Page

28745

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