期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 310, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121331
关键词
CeO2; Pr6O11; Propane and soot combustion; O(x)(n- )species; Lattice oxygen
资金
- projects of the National Key R&D Program of China [2017YFC0211102]
- National Natural Science Foundation of China [22076176]
- Natural Science Foundation of Shandong Province [ZR2021YQ14]
- Youth Innovation Plan of Shandong Province [2019KJD001]
- Fundamental Research Funds for the Central Universities [202141008, 202042002, 202061047]
Distinguishing the specific roles of superficial O(x)(n-) and interfacial lattice oxygen in catalytic combustion, especially over catalysts consisting of reducible metal oxides, is important yet difficult. This study compares two natural counterparts, CeO2 (an Oxn-generator) and Pr6O11 (a lattice oxygen contributor), and suggests that catalytic combustion of propane follows a Mars-van Krevelen mechanism, with catalyst lattice oxygen being the dominant reactive phase. In the case of soot combustion, adsorbed O-x(n-) acts as a more sustainable oxidant compared to lattice oxygen. This comparison method is widely applicable for identifying the dominant reactive phases in oxidation reactions over oxide-based catalysts.
It is important yet difficult to distinguish the specific roles of superficial O(x)(n- )and interfacial lattice oxygen in catalytic combustion, especially over catalysts consisting of reducible metal oxides. In this study, based on the comparison of two natural counterparts with similar structure - CeO2 (an Oxn-generator) and Pr6O11 (a lattice oxygen contributor), it is suggested that the catalytic combustion of propane under lean-burn conditions followed a typical Mars-van Krevelen mechanism, in which catalyst lattice oxygen represented the dominant reactive phases while superficial O(x)(n- )played negligible roles. As for soot combustion, adsorbed O-x(n-) represented more sustainable oxidants than lattice oxygen (drained easily at the beginning of the reactions). Such a comparison is readily achieved and widely applicable, which may shed light on the identification of dominant reactive phases for various oxidation reactions over oxide-based catalysts.
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