Low-temperature catalytic oxidation of NO over Mn-Co-Ce-Ox catalyst

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• 作者：Kai Li ; Xiaolong Tang ; ^{txl-km@163.com} ; Honghong Yi ; Ping Ning ; Dongjuan Kang ; Chi Wang
• 关键词：Catalytic oxidation ; NO ; Mn&ndash ; Co&ndash ; Ce&ndash ; Ox ; H2O ; SO2
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：1 June, 2012
• 卷：192
• 期：Complete
• 页码：99-104
• 文件大小：1158 K

摘要

A series of manganese-cobalt-cerium oxide (Mn-Co-Ce-Ox) catalysts were prepared by co-precipitation method and tested for low temperature (<200 掳C) catalytic oxidation of NO in the presence of O₂. The experimental results showed that the best catalyst yielded about 80%NO conversion at 150 掳C with a space velocity of 35,000 h^鈭?. As the cerium content was increased from 0%to 20%(mass%), NO conversion increased significantly, while decreased at higher cerium contents (30-40%). As comparison, single oxides were also investigated, and their activities were slower than those of Mn-Co-Ce-Ox catalyst. The effect of O₂ (0-11%) was evaluated, and it is almost constant when the concentration of O₂ was above 3%. The activity was suppressed with the coexisting of H₂O and SO₂ due to the generation of nitrates and sulfates, and the activity was restored to 45%after turning them off. The excellent low-temperature catalytic activity is mainly due to the amorphous phase, pore structure and high specific areas.