Citation: Xiao Kang, Wang Qiong, Chen Yuehua. Decomposition Process of Cu/ZnO Methanol Catalyst Precursor: An In Situ Observation by TEM[J]. Chemistry, ;2018, 81(11): 992-999. shu

Decomposition Process of Cu/ZnO Methanol Catalyst Precursor: An In Situ Observation by TEM

School of Materials Science & Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023

Received Date: 27 June 2018
Accepted Date: 1 August 2018

Figures(11)

The decomposition process of one of the best methanol catalyst precursors, zincian malachite, was studied, and the structural change during the decomposition was in situ observed by TEM. HRTEM, ED and STEM mapping analysis suggest that there are mainly four decomposition stages. That is, the zincian malachite crystal firstly decomposes at random zones and outer surface, causing local structural collapse, accompanying with holes formation in the bulk and amorphous diffused layer formation on the surface; then the holes grow larger and more holes appeare, and the collapsed layer on surface further diffuse. Meanwhile, CuO crystallizes gradually at both hole sites and diffused layer regions. Finally, the structure of zincian malachite completely collapses to afford intersected CuO and ZnO in the form of crystalline CuO separated by amorphous ZnO. After that, ZnO begin to crystallize under further heating to give the final calcined catalyst with interdispersed CuO crystallites and ZnO crystallites. The direct observation of structural change during decomposition promotes our understanding on the calcination process of methanol catalyst precursors, and gives clues for optimizing calcination condition.
- Methanol synthesis,
- Catalyst precursor,
- Zincian malachite,
- Calcination,
- In situ TEM
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