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Issue 70, 2016, Issue in Progress
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A mullite oxide catalyst of SmMn2O5 for three-way catalysis: synthesis, characterization, and catalytic activity evaluation

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Abstract

Mullite oxide SmMn2O5 (SMO) was synthesized through a co-precipitation method. The CO + O2 model system and more realistic gas mixtures were evaluated, and compared with perovskite LaCoO3 (LCO), SMO showed a better reaction activity as well as a higher catalytic activity and stronger hydrothermal resistance. Characterizations including XRD, BET, SEM, XPS, H2-TPR, O2-TPD, and CO + O2 pulse were undertaken in order to gain insight into the origin of the SMO three-way catalytic activity. The lower adsorbed oxygen reduction temperature for SMO by H2-TPR indicated a better reducibility. O2-TPD suggested that SMO exhibited excellent mobility of β-oxygen species. CO + O2 pulse further revealed that the SMO catalyst had a better oxygen storage capacity than the LCO perovskite did. With a better reducibility, facile mobility of oxygen species and better oxygen storage capacity, mullite oxide SMO showed a preferable three-way catalytic activity.

Graphical abstract: A mullite oxide catalyst of SmMn2O5 for three-way catalysis: synthesis, characterization, and catalytic activity evaluation

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Publication details

The article was received on 12 May 2016, accepted on 25 Jun 2016 and first published on 28 Jun 2016


Article type: Paper
DOI: 10.1039/C6RA12313A
RSC Adv., 2016,6, 65950-65959

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    A mullite oxide catalyst of SmMn2O5 for three-way catalysis: synthesis, characterization, and catalytic activity evaluation

    P. Zhao, P. Yu, Z. Feng, R. Chen, L. Jia, J. Wang, M. Shen and B. Shan, RSC Adv., 2016, 6, 65950
    DOI: 10.1039/C6RA12313A

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