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Journal of Materials Science

, Volume 42, Issue 19, pp 8320–8325 | Cite as

Preparation and characterization of Cu/SiO2 catalyst by co-gelation process

  • Mingfang Zheng
  • Tianbo ZhaoEmail author
  • Wenguo Xu
  • Fengyan Li
  • Yue Wang
Article

Abstract

Cu/SiO2 catalyst with bimodal pore structure was prepared by co-gelation reactions of tetramethoxysilane (TMOS) and copper nitrate in the presence of poly (ethylene oxide) (PEO) with an average molecular weight of 10,000 and the catalyst of acetic acid. In this process, the interconnected macroporous morphology was formed when transitional structures of spinodal decomposition were frozen by the sol–gel transition of silica. The addition of copper into the silica–PEO system had a negligible effect on the morphology formation. In gel formation, it was found that the crystallite sizes of the CuO estimated from the peak width in the Cu/SiO2 with the presence of PEO were not small as expected. It was considered that there was no obvious interaction between the Cu cation and PEO, most of the copper ions in wet silica gel were present in the outer solution. They easily aggregated as copper salts in the drying process of wet gel and decomposed into CuO particles in heating. While in the Cu/SiO2 with the absence of PEO, the Cu was selectively entrapped as small particles in the gel skeleton due to the interaction between Cu aqua complex and silica gel network.

Keywords

TMOS Copper Nitrate Outer Solution Nitrate Trihydrate Bimodal Pore Structure 

Notes

Acknowledgement

The authors are grateful to the financial support from China Petrochemical Corp. (No. X504033).

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Copyright information

© Springer Science+Business Media, Inc. 2007

Authors and Affiliations

  • Mingfang Zheng
    • 1
  • Tianbo Zhao
    • 1
    Email author
  • Wenguo Xu
    • 1
  • Fengyan Li
    • 2
  • Yue Wang
    • 2
  1. 1.Department of Chemistry, School of ScienceBeijing Institute of TechnologyBeijingP.R. China
  2. 2.Department of Applied ChemistryBeijing Institute of Petrochemical TechnologyBeijingP.R. China

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