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Effect of Precipitation Method and Ce Doping on the Catalytic Activity of Copper Manganese Oxide Catalysts for CO Oxidation
Xue-bin Zhang,Kuo-yan Ma,Ling-hui Zhang,Ling-hui Zhang,Ya Dai,Shao-min Liu*
1.Department of Chemistry, University of Science and Technology of China, Hefei 230026, China;2.Technology Center, China Tobacco Chuanyu Industrial Corporation, Chengdu 610017, China
Abstract:
The influence of Ce doping and the precipitation method on structural properties and the catalytic activity of copper manganese oxides for CO oxidation at ambient temperature have been investigated. The catalysts were characterized by means of the powder X-ray diffraction and N2 adsorption-desorption, the inductively coupled plasma atomic emission spectrometry, the temperature programmed reduction, diffuse reflectance UV-Vis spectra, and the X-ray photoelectron spectroscopy. It was found that after doping little amount of Ce in copper manganese oxide, CeO2 phase was highly dispersed and could prevent sintering and aggregating of the catalyst, the size of the catalytic material was decreased, the reducibility was enhanced, the specific surface area was increased and the formation of the active sites for the oxidation of CO was improved significantly. Therefore, the activity of the rare earth promoted catalyst was enhanced remarkably.
Key words:  CO oxidation, Ce-doped, Copper manganese oxide, Catalytic activity, Reverse co-precipitation
FundProject:
沉淀方法及铈掺杂对铜锰氧化物催化剂催化氧化CO性能的影响
张学彬1, 马扩颜2, 张灵辉1, 雍国平1, 戴亚2, 刘少民*3
1.中国科学技术大学化学系,合肥230026;2.中国烟草川渝工业公司技术中心,成都610017;3.中国科学技术大学化学系,合肥230026*
摘要:
研究了铈掺杂及沉淀方法对铜锰氧化物催化剂的结构特性及室温催化氧化CO性能的影响. 使用X射线衍射、N2吸附脱附、等离子体发射光谱、程序升温还原、紫外可见漫反射以及X射线光电子能谱等手段对各催化剂进行了表征. 发现掺杂少量的铈于铜锰氧化物催化剂中,CeO2相高度分散并能阻止催化剂的烧结和团聚,所制得的催化剂的颗粒较小,氧化还原性能提高,比表面增大,并形成了较多的活性位点,使其对CO的催化氧化性能明显提高.
关键词:  CO氧化,铈掺杂的铜锰氧化物,催化活性,反向共沉淀
DOI:10.1088/1674-0068/24/01/97-102
分类号: