| 刘璐,郑成航,高翔.放电气氛对复合金属氧化物催化剂结构和活性的影响[J].分子催化,2018,32(1):54-62 |
| 放电气氛对复合金属氧化物催化剂结构和活性的影响 |
| Effect of Discharge Atmosphere on Structure and Performance of Composite Metal Oxides Catalysts |
| 投稿时间：2017-11-17 修订日期：2017-12-30 |
| DOI： |
| 中文关键词: 等离子体 锰氧化物 二氧化铈 NO 催化氧化 |
| 英文关键词:plasma manganese oxide cerium oxide NO catalytic oxidation |
| 基金项目:This work has been supported by the National Key Research and Development Plan (2017YFB0603200) and the Postdoctoral Research Funding Plan of Jiangsu Province (1701029A). |
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| 中文摘要: |
| 采用等离子体辅助溶胶凝胶法制备了复合金属氧化物MnCeOx催化剂，研究了N2、Ar、空气等气氛产生的等离子体预处理对催化剂结构和活性的影响，通过低温氮吸附-脱附、X射线衍射（XRD）、X射线光电子能谱（XPS）和程序升温还原（H2-TPR）等手段对催化剂表面的物理化学特性进行了表征分析.结果表明不同气氛的等离子体可以不同程度地分解催化剂前驱体中的硝酸盐和有机物，并有效提高催化剂的氧化活性.经空气等离子体预处理制备的催化剂在275℃时的对NO氧化效率为75%，比直接煅烧方法制备的催化剂的氧化效率高20%.等离子体预处理制备催化剂能够使MnOx和CeO2之间的相互作用增强，从而提高催化剂的比表面积，提高催化剂表面Ce3+的比例，显著增加催化剂表面的化学吸附氧和弱结合的氧物种.等离子体预处理对催化剂表面的物理化学性质的优化，提高了催化剂的氧化还原性能和催化氧化性能. |
| 英文摘要: |
| The manganese-cerium composite oxides catalysts were prepared with the pretreatment of plasma. The effects of the discharge atmosphere of the plasma, including N2, Ar, and air, on the structure and performance of manganese-cerium oxides were investigated. The physical and chemical properties of the samples were characterized by means of the BET surface area, X-ray diffraction, X-ray photoelectron spectra and H2-temperature programmed reduction analysis. Plasma pretreatment can improve the catalytic oxidation performance of the catalyst. The catalyst pretreated by air plasma displays the highest catalytic activity, whose NO oxidation efficiency is about 75% at 275℃, which is 20% higher than the catalyst prepared by the traditional method. Plasma pretreatment can improve oxygen mobility and oxidation-reduction ability at low temperatures. According to the characterization of the catalysts, the improvement of the redox ability and catalytic activity is attributed to the enhancement of the formation of solid solution structure between MnOx and CeO2 with plasma pretreatment, leading to an increase of specific surface area, the ratio of Ce3+ at catalyst surface and the amount of surface active oxygen, which result in the improvement of the redox ability and catalytic activity. |
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