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固相反应法制备CeO2-CuO催化剂及其催化氧化CO的研究

时间:2019-01-11 17:04来源:毕业论文
不论采用哪种方法制备,当二氧化铈的含量为15%时,具有最佳的低温还原特性,且产物的催化活性最好。用草酸络合化使催化剂当中的氧化铜成分分散性好于采用草酸铵作为络合剂所制

摘 要:本文以硝酸铜和硝酸铈为原料,用草酸和草酸铵为络合剂,采用固相反应法制备了CeO2-CuO催化剂,并对所制备催化剂进行了TPR和XRD表征。考察了不同CeO2含量的催化剂对一氧化碳的催化氧化活性。XRD结果表明,二氧化铈含量的增加对氧化铜具有很好的分散作用,使氧化铜粒径变小;TPR结果表明,不论采用哪种方法制备,当二氧化铈的含量为15%时,具有最佳的低温还原特性,且产物的催化活性最好。用草酸络合化使催化剂当中的氧化铜成分分散性好于采用草酸铵作为络合剂所制备的催化剂样品。CO活性评价表明,当二氧化铈含量15%时,活性中心数目最多。但采用草酸作为络合剂所制备的催化剂催化氧化活性温度均低于采用草酸铵作为络合剂所制备的催化剂样品。32580
毕业论文关键词: 催化氧化;一氧化碳;二氧化铈;活性
Study on Preparation of CeO2-CuO catalyst and its catalytic oxidation of CO by solid state reaction method
Abstract:In this paper, we ues the copper nitrate and cerium nitrate as raw material,ammonium oxalate and oxalate as complexing agents,prepare the CeO2-CuO catalyst by solid phase reaction.,
The XRD and TPR characterization of the prepared catalysts were also carried out.The catalytic activity of the catalysts for carbon monoxide was investigated by the catalyst of different CeO2 contents.The XRD results show that the ceria content increase of copper oxide has good dispersion and the copper oxide particle size is smaller; with the same time,the TPR results showed that the regardless of the adoption of what kind of preparation method when ceria content is 15%, with optimum temperature reduction characteristics.And the catalytic activity of the product is best.The oxidation of copper in the catalysts was better than that of the catalysts prepared by oxalic acid as the catalyst.CO activity evaluation showed that the number of active centers was the highest when the content of two was 15%.However, the catalytic oxidation activity of the catalyst prepared by oxalic acid as complex agent is lower than that of the catalyst prepared by ammonium oxalate as complexing agent. 源自$六l维,论:文w网)加7位QQ3249^114 www.lwfree.cn
Key words: Catalytic oxidation;carbon monoxide; two cerium oxide; activity
目  录
1 绪论    1
 1.1 引言    1
 1.2 课题研究现状    2
  1.2.1 CuO催化剂    3
  1.2.2 CeO2    3
  1.2.3 CuO-CeO2    3
 1.3 催化剂的合成方法    4
  1.3.1共沉淀法    4
  1.3.2沉积一沉淀法    5
  1.3.3柠檬酸法    5
  1.3.4浸渍法    5
  1.3.5其他合成方法    6
 1.4本文的研究思路与内容    7
2 实验部分    8
 2.1 实验试剂及仪器    8
  2.1.1 实验药品及试剂    8
  2.1.2 实验中所用的气体    8                                  
  2.1.3 实验仪器与设备    9
 2.2 实验步骤    9
  2.2.1 CeO2-CuO催化剂的制备    9
  2.2.2 催化剂的表征    10
 2.3.结果和讨论    14
  2.3.1催化剂的XRD分析    14
  2.3.2催化剂的TPR分析    18
  2.3.3催化剂的催化氧化CO活性    20
3 结论    23
致  谢    24
参考文献    25 固相反应法制备CeO2-CuO催化剂及其催化氧化CO的研究:http://www.lwfree.cn/yanjiu/20190111/29243.html
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