化工学报 ›› 2018, Vol. 69 ›› Issue (2): 718-724.DOI: 10.11949/j.issn.0438-1157.20170976

• 催化、动力学与反应器 • 上一篇    下一篇

微反应器中的混合对Cu-ZnO催化剂微结构形成过程的影响

凌晨1, 蒋新1, 汪志勇1, 秦湘飞1, 卢建刚2   

  1. 1 浙江大学化学工程与生物工程学院, 浙江省化工高效制造技术重点实验室, 浙江 杭州 310027;
    2 浙江大学控制科学与工程学院, 工业控制技术国家重点实验室, 浙江 杭州 310027
  • 收稿日期:2017-07-25 修回日期:2017-11-28 出版日期:2018-02-05 发布日期:2018-02-05
  • 通讯作者: 蒋新
  • 基金资助:

    国家自然科学基金项目(21276223,21676236);国家重点研发计划项目(2017YFC0211802)。

Influence of mixing inside microreactor on microstructural evolution of Cu-ZnO catalyst

LING Chen1, JIANG Xin1, WANG Zhiyong1, QIN Xiangfei1, LU Jiangang2   

  1. 1 Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China;
    2 State Key Laboratory of Industrial Control Technology, Department of Control Science and Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2017-07-25 Revised:2017-11-28 Online:2018-02-05 Published:2018-02-05
  • Supported by:

    supported by the National Natural Science Foundation of China (21276223, 21676236) and the National Key Research and Development Program of China (2017YFC0211802).

摘要:

通过对微反应器中流速的调控,研究了混合过程对Cu-ZnO催化剂微结构形成过程的影响。采用Villermaux-Dushman反应体系测量了不同流速下反应器中的混合状况,采用X射线衍射(XRD)、高倍电镜线扫(EDS)、X射线光电子能谱(XPS)分析了对应流速下制备得到的前体和氧化物的结构。结果显示,混合强度增加,前体中的Cu2+、Zn2+分布更为均匀,绿铜锌矿的比例减小,锌孔雀石中的Zn含量提高;进而导致其热分解形成的氧化物中Cu-Zn分布也更为均匀,CuO-ZnO界面增加,CuO晶粒粒径减小。研究表明,沉淀反应时混合条件的改变,导致后续系列中间产物中Cu-Zn分布的差异,通过这一路径,混合对反应的影响最终作用于催化剂结构。

关键词: 微反应器, 混合, 纳米结构, 共沉淀法, 流速, Cu-Zn分布

Abstract:

The influence of mixing inside the microreactor on the microstructural evolution of Cu-ZnO catalyst was investigated by regulating the flow rate. Mixing efficiency in the microreactor was measured by Villermaux-Dushman reaction system under different flow rates, and the structures of precursor and oxide were characterized by X-ray powder diffraction (XRD), energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The results showed that with increase of the mixing intensity, the distribution of Cu2+ and Zn2+ in precursor becomes more uniform, the fraction of aurichalcite decreases and Zn content in zincian malachite rises. The difference in the precursors acts on the oxides, leading to a more uniform Cu-Zn distribution, a better dispersion between CuO and ZnO, and the decrease of CuO size. Above study reveals, it is by the Cu-Zn distribution that the changes of mixing during the precipitation affects the subsequent product and results in the difference in Cu-ZnO catalyst microstructure.

Key words: microreactor, mixing, nanostructure, co-precipitation, flow rate, Cu-Zn distribution

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