Citation: SUN Kai, ZHANG Xiao-yu, ZHANG Lin, BIAN Zhong-kai, HUANG Wei, ZHAO Zhi-huan. Influence of acid and alkaline silica sol on the performance of Cu/Zn/Al slurry catalysts[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(10): 1221-1229. shu

Influence of acid and alkaline silica sol on the performance of Cu/Zn/Al slurry catalysts

1.
1. Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China;

Corresponding author: HUANG Wei, ZHAO Zhi-huan,
Received Date: 28 May 2015
Available Online: 19 July 2015
Fund Project: 国家自然科学基金重点项目(21336006) (21336006)国家自然科学基金面上项目(21176176) (21176176)高等学校博士学科点专项(优先发展领域)(20111402130002)资助 (优先发展领域)(20111402130002)

A series of Cu/Zn/Al/Si slurry catalysts were prepared by the complete liquid-phase technology with acid and alkaline silica sol in the paper. The catalysts are characterized by means of XRD, H₂-TPR, FT-IR, BET, NH₃-TPD, XPS and TEM. When the acid silica sol is added, which has the similar environment with the process of precursor preparation, the conversion of CO and selectivity of dimethyl ether reach maxiumum, being 65.38% and 76.26% respectively. The acid silica sol weakens the force between Cu and other components, resulting in the Cu component is easy to be reduced and more active lattice planes of Cu⁰ on the catalyst are exposed. The acid/alkaline properties of silica sol influence acid site strength and the number of acid sites of catalysts and make both strong acidic sites and the weak acidic sites migrate to lower temperature position. In DME synthesis reaction, it is found that the acid silica sol can increase the ratio of the weak acidic sites to the strong acidic sites on the catalysts, which promotes dehydration performance of methanol and the selectivity of DME. In addition, the catalysts with large specific surface area and mesoporous pore structure are favorable for the activity and selectivity of DME.
- complete liquid-phase technology,
- acid and alkaline,
- silica sol,
- dimethyl ether,
- Cu/Zn/Al catalysts
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