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Issue 41, 2013
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Chemistry of precious metal oxides relevant to heterogeneous catalysis

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Abstract

The platinum group metals (PGMs) are widely employed as catalysts, especially for the mitigation of automotive exhaust pollutants. The low natural abundance of PGMs and increasing demand from the expanding automotive sector necessitates strategies to improve the efficiency of PGM use. Conventional catalysts typically consist of PGM nanoparticles dispersed on high surface area oxide supports. However, high PGM loadings must be used to counter sintering, ablation, and deactivation of the catalyst such that sufficient activity is maintained over the operating lifetime. An appealing strategy for reducing metal loading is the substitution of PGM ions into oxide hosts: the use of single atoms (ions) as catalytic active sites represents a highly atom-efficient alternative to the use of nanoparticles. This review addresses the crystal chemistry and reactivity of oxide compounds of precious metals that are, or could be relevant to developing an understanding of the role of precious metal ions in heterogeneous catalysis. We review the chemical conditions that facilitate stabilization of the notoriously oxophobic precious metals in oxide environments, and survey complex oxide hosts that have proven to be amenable to reversible redox cycling of PGMs.

Graphical abstract: Chemistry of precious metal oxides relevant to heterogeneous catalysis

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Publication details

The article was received on 05 Jul 2013, accepted on 23 Aug 2013 and first published on 06 Sep 2013


Article type: Perspective
DOI: 10.1039/C3DT51818C
Citation: Dalton Trans., 2013,42, 14653-14667
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    Chemistry of precious metal oxides relevant to heterogeneous catalysis

    J. A. Kurzman, L. M. Misch and R. Seshadri, Dalton Trans., 2013, 42, 14653
    DOI: 10.1039/C3DT51818C

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