期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 264, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118475
关键词
CH4 activation; Pd-Ce interface; Pd-PdO interaction; Pd-0 active phase; NGV Three-Way Catalyst
资金
- National Key R&D Program of China [2016YFC0204902]
- National Natural Science Foundation of China [21673146]
- Graduate Student's Research and Innovation Fund of Sichuan University [2018YJSY093]
- Doctoral Graduate Students' Academic Visit Fund of Sichuan University
This study reports a significant impact of the calcination temperature on the performances of Pd/Al2O3-CeO2 Three-Way-Catalysts to treat exhaust from natural gas fueled vehicles. Calcination from 550 degrees C to 950 degrees C led to Pd particles in the range 1.9-8.5 nm. It was found that PdO can be reduced to more active Pd-0 species under stoichiometric NGV conditions. More specifically, the 1.9 nm Pd particles, developing stronger Pd-Ce interaction were found more reducible and correspond to enhanced catalytic properties towards methane abatement. At high calcination temperature, corresponding to larger Pd particles, the deterioration of the Pd-Ce interface is accompanied with lower TOF jointly with higher activation barriers. Accordingly, the Pd-0-PdO interaction becomes prevalent to activate methane. Based on these observations, it was concluded that Pd-0-Ce and Pd-0-PdO interface related to the Pd particle size may be considered as criteria for identifying the performance of Pd-based NGV catalysts.
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