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huang811000银虫 (正式写手)
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[求助]
重金求高手翻译~立即散金，厚道斑竹，帮者有份
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| 经过研究得出以下主要结论：1) 用柠檬酸络合法将制备LaMnO3和La0.8K0.2MnO3钙钛矿催化剂。K+掺杂取代La3+造成局域电荷不平衡，同时引起晶胞膨胀，氧空位增多，有利于气相氧在催化剂表面上的吸附、活化和迁移， LaMnO3和La0.8K0.2MnO3钙钛矿催化剂在10%O2气体氛围下使碳烟的起燃温度分别下降了103℃和125℃。其中表面弱吸附氧含量与催化剂催化活性和碳烟的深度氧化密切相关。2) NO除了部分氧化形成NO2促进碳烟的燃烧以外，还促进了活性氧物种的生成。由于La0.8K0.2MnO3比LaMnO3有更多的氧空位，而NO与O2有相似的电子结构，很容易被催化剂的氧空位吸附以吸附态的形式存在，从而削弱晶格氧与金属离子之间的作用，促进了部分晶格氧的溢出和向活性氧物种的转化以及氧空位的循环再生。在NO+O2气体氛围下，La0.8K0.2MnO3催化碳烟的活性更加显著。 |
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wyky2007136
金虫 (小有名气)
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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
sltmac(金币+20): 2012-02-25 09:51:09
| 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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3楼2012-02-15 09:25:20
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