Effects of catalysts on the kinetics of CaO desulfurization

Abstract

Kinetics of CaO desulfurization reaction and the effects of some catalysts on it were investigated by thermogravimetric analysis method. the results showed that the conversion of CaO increases with the increase of temperature. The kinetic behavior of desulfurization can be explained by grain model. The activation energy of surface reaction (E~a) and the activation energy of product layer diffusion (E~p) were determined by using the model. The overall rate of desulfurization is controlled initially by surface chemical reaction, and then shift to product layer diffusion control. Some alkali metal chlorides were chosen as catalysts. These salts can improve both the initial reaction rate and final fraction conversion of CaO. E~a decreases orderly when the added catalysts changed from Li, Na, K to Cs, while E~p increases.

Key words: CALCIUM OXIDE, REACTION KINETICS, CATALYST, SULFUR DIOXIDE

CLC Number:

O643

Cite this article

Wu Zenghua;Kou Peng;Qiu Xinping;Xue Fangyu;Chen Changhe. Effects of catalysts on the kinetics of CaO desulfurization[J]. Acta Chimica Sinica, 2000, 58(11): 1316-1321.

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