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The effect of Cu–Zn distribution in zincian malachite on the formation of individual CuO and ZnO particles

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Abstract

Cu–Zn distribution in zincian malachite was regulated in preparation process, and its effect on the formation of CuO and ZnO during the thermal decomposition was investigated. In the HRTEM images, there are obvious individual particles comprised of pure CuO or ZnO in the calcined samples prepared by conventional batch reactor (BR), whereas no pure particle appears in the samples prepared by microchannel reactor (MR). The fraction of Zn2+ incorporating into malachite and the relevance between Cu and Zn confirmed MR precursors were more homogeneous than BR precursors. The TGA/DTG curves showed the uniform distribution caused more interfaces and stronger interaction between Cu and Zn, which could depress the formation of individual CuO and ZnO particles. The combined effects of non-uniform distribution and thermodynamics de-mixing lead to the appearance of CuO and ZnO particles. The result illustrates how the Cu–Zn distribution acts on the thermal decomposition and affects catalyst structure.

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Acknowledgements

Financial support from National Key Research and Development Program of China (2017YFC0211802) and National Natural Science Foundation of China (21276223, 21676236) is gratefully acknowledged.

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  1. Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, People’s Republic of China

    Xin Jiang, Chen Ling & Zhiyong Wang

  2. State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou, 310027, People’s Republic of China

    Jiangang Lu

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Jiang, X., Ling, C., Wang, Z. et al. The effect of Cu–Zn distribution in zincian malachite on the formation of individual CuO and ZnO particles. J Therm Anal Calorim 137, 1519–1525 (2019). https://doi.org/10.1007/s10973-019-08081-3

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