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Citation: Yang Ru, Hu Tian-Dou, Liu Tao, Xiang Hong-Wei, Zhong Bing, Xu Yao, Wu Dong. Characterization of CuO-BaO/SiO₂ Catalysts Structure[J]. Acta Physico-Chimica Sinica, ;1998, 14(07): 590-596. doi: 10.3866/PKU.WHXB19980704 shu

Characterization of CuO-BaO/SiO₂ Catalysts Structure

1.
State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001

Received Date: 11 September 1997
Available Online: 15 July 1998

The structure of CuO-BaO/SiO2 catalysts and their reduced states has been characterized by means of XRD, XPS and EXAFS. Both the results of XRD and XPS indicate that(topper and barium in CuO-BaO/SiO2 exist in CuO and BaO respectively and the SiO2 support has influence on the structure of CuO. The EXAFS results show that the coordination number and length of Cu-O shell and Cu-Cu shell gradually decrease with the supported content decreasing and the extent of decrease is the largest for low supported content samples. When the supported content exceeds 13.39%, CuO in samples is in crystalline state, when the supported content is smaller or equals 13.39%, CuO in samples is in monolayer dispersion state. In the reduced catalyst samples, only metal copper is detected. With the content of CuO in CuO-BaO/SiO2 decreasing, the length and coordination number of Cu-Cu bond of metal copper on reduced catalyst surface also decrease gradually.
- CuO,
- BaO,
- XRD,
- XPS,
- EXAFS,
- Ultrafine SiO2
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沈阳化工大学材料科学与工程学院沈阳 110142

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Characterization of CuO-BaO/SiO2 Catalysts Structure

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Characterization of CuO-BaO/SiO₂ Catalysts Structure