期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 627, 期 -, 页码 53-63出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.07.007
关键词
Strong metal-support interaction; Au-CeO(2 )catalyst; Al(3+)doping; Sintering resistant; Superior catalytic activity
资金
- Natural Science Foundation of Shan-dong Province [ZR2021MB063, ZR2020MB090]
- National Natural Science Foundation of China [21777055, 51771085, 51571104]
Al3+ doping is an effective strategy to improve the catalytic activity and sintering resistance of supported Au catalysts. It increases the number of oxygen vacancies, providing preferential adsorption sites for CO molecules. In addition, Al3+ doping promotes the formation of smaller and more dispersed Au nanoparticles. The prepared AuCeAl catalysts exhibit superior catalytic performance even at high temperatures.
The classical strong metal-support interaction (SMSI) plays a key role in improving thermal stability for supported Au catalysts. However, it always decreases the catalytic activity because of the encapsulation of Au species by support. Herein, we demonstrate that Al3+ is a functional additive which could effectively improve both catalytic activity and sintering resistant property for H-2 pretreated Al3+ doped CeO2 supported Au (AuCeAl) catalyst at high temperature. The physical characterization and in-situ DRIFTS results provide insight that more oxygen vacancies generated by Al3+ doping could be as preferential adsorption sites for CO molecules when the encapsulation of Au species occurred, which is certificated by an accelerated formation of bicarbonate species. In the meantime, smaller Au nanoparticles with higher dispersion (2.8 nm, 85.63%) is achieved in AuCeAl catalysts, compared with that in CeO2 supported Au (AuCe) catalysts (5.1 nm, 36.17%). Additionally, the as-prepared AuCeAl catalysts also have superior catalytic performance even after calcination at 800 degrees C in air. (C) 2022 Elsevier Inc. All rights reserved.
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