Journal
RSC ADVANCES
Volume 6, Issue 70, Pages 65950-65959Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra12313a
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Funding
- National Basic Research Program of China [2013CB934800]
- National Natural Science Foundation of China [51575217, 51572097]
- Fundamental Research Funds for the Central Universities, HUST [2014TS037]
- Hubei Province Funds for Distinguished Young scientists [2014CFA018, 2015CFA034]
- Thousand Young Talents Plan
- Recruitment Program of Global Experts
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13017]
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Mullite oxide SmMn2O5 (SMO) was synthesized through a co-precipitation method. The CO + O-2 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, H-2-TPR, O-2-TPD, and CO + O-2 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 H-2-TPR indicated a better reducibility. O-2-TPD suggested that SMO exhibited excellent mobility of beta-oxygen species. CO + O-2 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.
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