Low-temperature CO oxidation on multicomponent gold based catalysts.

Tomás Ramírez Reina,José A Odriozola,Miguel A Centeno,Svetlana Ivanova

doi:10.3389/fchem.2013.00012

Abstract

In this work the development of gold catalysts, essentially based on γ-alumina with small superficial fraction of Ce-Fe mixed oxides as support for the low temperature CO oxidation is proposed. Characterization results obtained by means of TEM, OSC, XPS, UV-Vis spectroscopy and H2-TPR are employed to correlate the activity data with the catalysts composition. The bare γ-alumina supported gold catalyst demonstrates the poorest activity within the series. The addition of CeO2 or FeOX improves the catalytic performance, especially observed for the CeO2-FeOx mixed oxide doped samples. This enhanced CO oxidation activity was related to the Ce-Fe interaction producing materials with promoted redox properties and therefore oxidation activity.

Highlights

Gold has been long discarded from catalytic applications due to the inert nature of massive gold
Intensive research has been devoted to the determination of the reactions types that can be efficiently catalyzed by gold nanoparticles, to the increase of the stability of the gold nanoparticles avoiding their sintering, to understand the role of the support in the catalytic activity and to demonstrate the similarities and distinctive properties of gold catalysis with respect to other noble metals (Corma and García, 2008) etc
A series of highly effective CO oxidation catalysts has been developed in the present paper

Summary

Introduction

Gold has been long discarded from catalytic applications due to the inert nature of massive gold It is about 30 years since the original breakthroughs of Hutchings (1985) and Haruta et al (1987) demonstrating that gold can be an excellent catalyst when supported on metal oxides in a highly dispersed state. Since this discovery, intensive research has been devoted to the determination of the reactions types that can be efficiently catalyzed by gold nanoparticles, to the increase of the stability of the gold nanoparticles avoiding their sintering, to understand the role of the support in the catalytic activity and to demonstrate the similarities and distinctive properties of gold catalysis with respect to other noble metals (Corma and García, 2008) etc. The catalyst can preserve its activity under these conditions for 2 years (Cortie et al, 2006)

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Results

Conclusion