The Metal-Support Interaction Concerning the Particle Size Effect of Pd/Al2 O3 on Methane Combustion

Kazumasa Murata; Yuji Mahara; Junya Ohyama; Yuta Yamamoto; Shigeo Arai; Atsushi Satsuma

doi:10.1002/anie.201709124

The Metal-Support Interaction Concerning the Particle Size Effect of Pd/Al₂ O₃ on Methane Combustion

Angew Chem Int Ed Engl. 2017 Dec 11;56(50):15993-15997. doi: 10.1002/anie.201709124. Epub 2017 Nov 15.

Authors

Kazumasa Murata¹, Yuji Mahara¹, Junya Ohyama^{1

2}, Yuta Yamamoto³, Shigeo Arai³, Atsushi Satsuma^{1

2}

Affiliations

¹ Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan.
² Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Katsura, Kyoto, 615-8520, Japan.
³ Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, Japan.

PMID: 29071775
DOI: 10.1002/anie.201709124

Abstract

The particle size effect of Pd nanoparticles supported on alumina with various crystalline phases on methane combustion was investigated. Pd/θ, α-Al₂ O₃ with weak metal-support interaction showed a volcano-shaped dependence of the catalytic activity on the size of Pd particles, and the catalytic activity of the strongly interacted Pd/γ-Al₂ O₃ increased with the particle size. Based on a structural analysis of Pd nanoparticles using CO adsorption IR spectroscopy and spherical aberration-corrected scanning/transmission electron microscopy, the dependence of catalytic activity on Pd particle size and the alumina crystalline phase was due to the fraction of step sites on Pd particle surface. The difference in fraction of the step site is derived from the particle shape, which varies not only with Pd particle size but also with the strength of metal-support interaction. Therefore, this interaction perturbs the particle size effect of Pd/Al₂ O₃ for methane combustion.

Keywords: heterogeneous catalysis; metal-support interaction; nanoparticles; oxidation; palladium.

Publication types

Research Support, Non-U.S. Gov't