Au/3DOM La0.6Sr0.4MnO3: Highly active nanocatalysts for the oxidation of carbon monoxide and toluene

By Yuxi Liu, H. Dai, Jiguang Deng, Xinwei Li, Y. Wang, Hamidreza Arandiyan, S. Xie, Huanggen Yang, G. Guo. 2013

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Abstract Three-dimensionally ordered macroporous (3DOM) La 0.6 Sr 0.4 MnO 3 (LSMO) and its supported gold ( x Au/LSMO, x  = 3.4–7.9 wt%) catalysts were prepared using the polymethyl methacrylate-templating and gas-bubble-assisted polyvinyl alcohol-protected reduction methods, respectively. There were good correlations of surface-adsorbed oxygen species concentration and low-temperature reducibility with the catalytic activity of the sample for CO and toluene oxidation. Among the LSMO and x Au/LSMO samples, 6.4Au/LSMO performed the best, giving T 50% and T 90% values of −19 and 3 °C for CO oxidation and 150 and 170 °C for toluene oxidation, respectively. The apparent activation energies (31–32 and 44–48 kJ/mol) obtained over x Au/LSMO were much lower than those (45 and 59 kJ/mol) obtained over LSMO for the oxidation of CO and toluene, respectively. It is concluded that higher oxygen adspecies concentration, better low-temperature reducibility, and strong interaction between Au and LSMO are responsible for the excellent catalytic performance of 6.4Au/LSMO.

Subfields: Catalysis, Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/400ff935274b5a435b208425f81fd1743df55ec9