| 王舒捷,邹谷初,徐尧,陈铭夏,上官文峰.Ce基复合氧化物同时催化去除碳烟-NOx的性能研究[J].分子催化,2015,(1):60-67 |
| Ce基复合氧化物同时催化去除碳烟-NOx的性能研究 |
| Ce-based Catalysts for Simultaneous Removal of Both Diesel Soot and NOx |
| 投稿时间：2014-12-16 修订日期：2015-01-24 |
| DOI： |
| 中文关键词: 催化去除 铈基氧化物 碳烟 NOx 柠檬酸络合法 |
| 英文关键词:Catalytic removal , Ce-based complex oxides, Soot, NOx Citrate acid complex method |
| 基金项目:国家自然科学基金(20807027) |
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| 中文摘要: |
| 本研究采用柠檬酸络合法制备了Ce基复合氧化物催化剂，分别在热重分析仪（TG）和管式反应器中测试了其氧化碳烟及同时脱除NOx的催化活性；并利用XRD、BET、H2-TPR、XPS表征手段考察其结构。其中，Co0.1/CeLa0.05复合氧化物同时催化去除碳烟和NOx的性能最佳，碳烟脱除率为50%的反应温度为301 oC，N2产率为41.4%。实验结果表明，Co主要以氧化物形式均匀分散在Ce-La固溶体表面，Co3+与Co2+价态共存，离子间的变价有利于提高催化剂的氧化还原性能，有效降低了碳烟的起燃温度。La的引入增大了催化剂的比表面积，抑制了CeO2晶粒长大，进而提高了N2产率。部分La和Co形成了微量的LaCoO3，形成了更多氧空位，有利于提高催化氧化碳烟的活性。 |
| 英文摘要: |
| Ce-based oxides were prepared by citric acid complex method and characterized by nitrogen physisorption, XRD, TEM, H2-TPR and XPS; their catalytic performances in simultaneous removal of diesel soot and NOx were investigated on a thermogravimetric apparatus and a tubular reactor. Co0.1/CeLa0.05 prevailed over all the detected materials in catalytic performance for simultaneous removal of soot and NOx. T50 of this catalyst (temperature for 50% soot combustion) was 301 oC, and the yield of N2 was 41.4%. A majority of cobalt oxides were dispersed on the surface of Ce-La solid solution. The mutual transformation between Co3+ and Co2+ enhanced the redox ability and oxygen storage capacity of pure ceria oxide, achieving lower temperature of combustion. Cerium–Cobalt complex oxide doped with Lanthanum presented a tremendous increase of surface area, leading to higher yield of N2. The formation of trace amount of LaCoO3 promoted oxygen vacancies creation, thus affecting positively to the soot combustion activity. |
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