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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 3    June 2001

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Mechanism explanation for SO2 oxidation
rate of Cs-Rb-V series sulfuric acid
catalyst at low temperature
CHEN Zhen-xing(陈振兴), YE Hua(叶  华),
LIU Jin(刘  今), LI Hong-gui(李洪桂)

Institute of Chemistry and Chemical Engineering,
Central South University, Changsha 410083, P.R.China

Abstract: The reaction kinetics of SO2 oxidation on Cs-Rb-V series sulfuric acid catalyst promoted by alkali salts such as cesium and rubidium was studied. A three-step reaction mechanism of SO2 oxidation was proposed, in which it was assumed that oxidation of quadrivalent vanadium complex was a controlling step. Then, a mechanism model equation was concluded according to the three-step reaction mechanism. The SO2 oxidation rate was measured with a non-gradient reactor under the conditions of temperature of 380~520 ℃ and space velocity of 3 600~7 200 h-1. Through calculating with Powell nonlinear regression method, the parameters of model equation were obtained:K1=0.152 exp(-62 073/(RT)),K2=8.18 exp(-2 384/(RT)), K3=0.221 exp(-18 949/(RT)). It was found that the model equation could fit with all the experimental reaction rate data very well.

 

Key words:   reaction mechanism; low temperature catalyst; sulfur dioxide; sulfuric acid

ISSN 1672-7029
CN 43-1423/U

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