沉淀方式对微波辐射老化制备CuO/ZnO/Al<sub>2</sub>O<sub>3</sub>催化剂性能的影响

郑华艳; 李博昱; 刘岩; 陈雄; 李忠

沉淀方式对微波辐射老化制备CuO/ZnO/Al₂O₃催化剂性能的影响

1.
太原理工大学煤化工研究所煤科学与技术教育部和山西省重点实验室, 山西太原 030024;
2.
北京化工大学化学化工学院,北京 100029

基金项目: 国家重点基础研究发展规划(973计划, 2012CB723105); 国家自然科学基金青年项目(21106092)。

详细信息

通讯作者:
李忠, E-mail: lizhong@tyut.edu.cn; Tel/Fax: +86-351-6018526

中图分类号: O614.121; O614.24⁺
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出版历程
- 收稿日期: 2011-08-19
- 修回日期: 2011-11-03
- 刊出日期: 2012-06-30

Effects of precipitation manner on catalytic performance of CuO/ZnO/Al₂O₃ catalyst aging under microwave irradiation

1.
Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024;
2.
Beijing University of Chemical Industry and Chemical Engineering, Beijing 100029

摘要

摘要: 采用微波辐射老化沉淀母液的方法,着重考察了沉淀方式对制备的CuO/ZnO/Al₂O₃催化剂及其前驱体的结构和催化性能的影响。实验结果表明,沉淀方式对催化剂的活性和稳定性影响较大,其活性顺序为分步沉淀法二＞并流共沉淀法＞分步沉淀法一＞反加法＞正加法。通过XRD、DTG、H₂-TPR等表征分析表明,先并流沉淀Al(NO₃)₃溶液和Na₂CO₃溶液,再并流沉淀Cu(NO₃)₂-Zn(NO₃)₂混合溶液与剩下的Na₂CO₃溶液,然后微波辐射老化所制备前驱体中含有更多的绿铜锌矿 (Cu,Zn)₅(CO₃)₂(OH)₆物相,焙烧后形成的CuO-ZnO协同作用强,且CuO分散性好,H₂还原温度较低,催化活性和稳定性也较高。
- 微波辐射 /
- CuO/ZnO/Al₂O₃催化剂 /
- 合成甲醇 /
- 沉淀方式
Abstract: CuO/ZnO/Al₂O₃ precursors were prepared by different precipitation manner; microwave irradiation was introduced in aging process. The effects of precipitation manner on composition of precursor, micro structure and performance of catalyst were characterized by means of XRD, DTG, H₂-TPR. The reaction results indicated that the order of catalytic activity was Stepwise II ＞ Parallel-flow ＞ Stepwise I ＞ Reversed ＞ Forward. When Al(NO₃)₃ solution and Na₂CO₃ solution were precipitated first and then Cu(NO₃)₂-Zn(NO₃)₂ solution were precipitated with remaining Na₂CO₃, the prepared precursor contained more (Cu, Zn)₅(CO₃)₂(OH)₆, which possessed well-dispersed CuO, strong synergy in CuO-ZnO and low H₂-reduction temperature after calcination.
- microwave irradiation /
- CuO/ZnO/Al₂O₃ catalyst /
- methanol synthesis /
- precipitation manner

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参考文献(21)

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