期刊
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷 59, 期 22, 页码 10407-10417出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.0c01308
关键词
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资金
- National Key Research and Development Program of China [2017YFC0212400]
- Natural Science Foundation of Henan Province [182300410168]
The hydrothermal method was used to synthesize alpha-MnO2 with nanoflower-like (NF) and nanowire-like (NW) morphologies. Besides, different amounts (5-15 wt %) of silver were loaded into flowerlike alpha-MnO2 (Ag(x)-NF) to promote the soot oxidation performance. The resulting catalysts have been characterized by different techniques. Soot oxidation was detected over temperature-programmed experiments. Unequal surface oxygen vacancies in different alpha-MnO2 result in different O-x(n-) generating capacities, as shown in the X-ray photoelectron spectroscopy (XPS) test. The NF had the highest ratio of highly reactive superoxide (O-2). In addition, the NF modified by optimal amounts of Ag could speed up the O-2(-) generation caused by the largest amount of surface oxygen vacancies. The density functional theory calculation revealed that the oxygen vacancies on alpha-MnO2 species could improve the adsorption of reactants and increase the surface energy of the asprepared catalyst, which result in excellent catalytic performance of Ag(10)-NF.
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