关键词: 氧化钙, 反应动力学, 催化剂, 固硫反应, 二氧化硫

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