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【答案】应助回帖
huang811000(金币+60, 翻译EPI+1): ★★★很有帮助 2012-02-18 19:14:14
sltmac(金币+20): 2012-02-25 09:51:09
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Through study, the following main conclusions can be drawn: 1) LaMnO3 and La0.8K0.2MnO3 perovskite catalysts are prepared by a citric acid complexing method; doping of K+ to replace La3+ can cause the local charge imbalance, and can cause the expansion of unit cells and the increase of oxygen vacancies at the same time, thereby facilitating the adsorption, activation and migration of gaseous oxygen on the catalyst surface; by using the LaMnO3 and La0.8K0.2MnO3 perovskite catalysts in 10% O2 gas atmosphere, the ignition temperature of soot decrease by 103°C and 125°C, respectively; and the content of oxygen weakly adsorbed on the surface is closely related to the catalytic activity and the deep oxidation of the soot; and 2) the partial oxidation of NO to form NO2 can promote the combustion of the soot, and can also promote the generation of reactive oxygen; because La0.8K0.2MnO3 has more oxygen vacancies than LaMnO3 and NO and O2 have a similar electron structure, NO (初步判断,不知道对不对,请作者根据上下文写出具体的物质)is easily adsorbed by the oxygen vacancies of the catalyst and exists in the form of adsorption, thus weakening the interaction between lattice oxygen and metal ions, promoting the overflow and the conversion of partial lattice oxygen to reactive oxygen, and promoting the circulated regeneration of the oxygen vacancies. In NO+O2 gas atmosphere, La0.8K0.2MnO3 has more significant activity in catalyzing the soot. |
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