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A Modified Co-precipitation Method to Prepare Cu/ZnO/Al2O3 Catalyst and Its Application in Low Temperature Water-gas Shift (LT-WGS) Reaction

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Abstract

A modified co-precipitation method for the production of Cu/ZnO/Al2O3 complex was studied. The modification was that part of Al was introduced by adding Al3+ into Cu2+/Zn2+ solution, and the rest of Al was added after co-precipitation step in the form of pseudo-boehmite. The prepared samples were characterized by different techniques such as X-ray diffraction, N2 adsorption, H2-N2O titration, temperature programmed reduction and scanning electron microscopy. X-ray diffraction characterizations revealed that Al3+ can be doped in aurichalcite lattice, and the maximum doping amount of Al3+ was 5.0% of total Cu and Zn atoms. The Cu/ZnO/Al2O3 sample produced by the modified method, in which co-precipitated Al3+ was 2.5% of total Cu and Zn atoms showed much better activity and stability in water-gas shift reaction than commercial sample. The high Cu surface area (26.1 m2/g) obtained by decompositon of doped aurichalcite is believed to be responsible for the activity enhancement. The stability was enhanced mainly because of the support effect of γ-Al2O3, which was decomposed from pseudo-boehmite in the calcination step.

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Authors and Affiliations

  1. Tianhua Chemical Branch, Xi’an Sunward Aeromat Co. Ltd., Xi’an, 710065, China

    Longlong Xu  (许龙龙), Dong Peng, Yimin Feng & Yanan Hou

  2. Sanjiang Chemical Factory of CSSG, Yuanan, 444200, China

    Wenhui Liu & Xiongjian Li

  3. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China

    Chi Huang  (黄驰)

Authors
  1. Longlong Xu  (许龙龙)
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  2. Dong Peng
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  3. Wenhui Liu
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  4. Yimin Feng
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  5. Yanan Hou
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  6. Xiongjian Li
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  7. Chi Huang  (黄驰)
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Correspondence to Chi Huang  (黄驰).

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Funded by the National Natural Science Foundation of China (51572201)

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Xu, L., Peng, D., Liu, W. et al. A Modified Co-precipitation Method to Prepare Cu/ZnO/Al2O3 Catalyst and Its Application in Low Temperature Water-gas Shift (LT-WGS) Reaction. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 33, 876–883 (2018). https://doi.org/10.1007/s11595-018-1907-8

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  • DOI: https://doi.org/10.1007/s11595-018-1907-8

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