Effect of promoter on study properties and catalytic activity of Ru/CeO<sub>2</sub> catalyst for ammonia synthesis

LIN Jian-xin; ZHANG Liu-ming; WANG Zi-qing; WANG Rong; WEI Ke-mei

Volume 40 Issue 07

Jul. 2012

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Article Navigation > Journal of Fuel Chemistry and Technology > 2012 > 40(07): 848-854

LIN Jian-xin, ZHANG Liu-ming, WANG Zi-qing, WANG Rong, WEI Ke-mei. Effect of promoter on study properties and catalytic activity of Ru/CeO2 catalyst for ammonia synthesis[J]. Journal of Fuel Chemistry and Technology, 2012, 40(07): 848-854.

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LIN Jian-xin, ZHANG Liu-ming, WANG Zi-qing, WANG Rong, WEI Ke-mei. Effect of promoter on study properties and catalytic activity of Ru/CeO₂ catalyst for ammonia synthesis[J]. Journal of Fuel Chemistry and Technology, 2012, 40(07): 848-854.

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Effect of promoter on study properties and catalytic activity of Ru/CeO₂ catalyst for ammonia synthesis

National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, China

Received Date: 2011-10-16
Rev Recd Date: 2011-12-24
Publish Date: 2012-07-31

Abstract

Abstract

A series of Ru based ammonia synthesis catalysts supported by ceria with different promoter precursors,such as KF、KNO₃、Ba(NO₃)₂、CsNO₃,were prepared.Not only studied the effect of single and double promoters for the catalytic activity but also studied the effect of promoters’ kinds and content.N₂ physisorption,CO chemisorption and X-ray diffraction were carried out to investigate the effect of promoter on surface area,pore size distribution and ruthenium dispersion of catalysts.It has been found that the effectiveness of F ion just like the role of alkaline or alkaline-earth-promoter for ammonia synthesis.For the single-promoted Ru/CeO₂ catalyst,cesium proved to be most effective in the studied four promoters.For the double-promoted one,the activity of the catalyst was affected remarkably by cesium and barium co-exists.Ammonia synthesis concentration of over 13.3% was obtained over Ba+Cs-Ru/CeO₂ catalyst under 400℃,10 MPa and 10 000 h^-1.The structure and the surface property of Ru/CeO₂ catalyst were changed when promoters added.But the real factor to improving catalytic activity is electronic effect rather than structural factors.
- promoter,
- ruthenium,
- ammonia synthesis,
- ceria

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References(24)

References

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