二氧化铈硫化反应动力学

STUDY OF REACTION KINETICS OF CeO 2 WITH SO 2

对二氧化铈的硫化反应动力学进行了系统研究，研究结果表明：二氧化铈的制备工艺对其硫化反应活性有明显影响，热解氢氧化物活性＞热解硝酸盐产物活性＞热解高氯酸盐产物活性＞热解草酸盐产物活性；硫化反应速率随时间的变化规律符合吸附－自催化机理；在硫化反应初期，二氧化硫浓度对反应速率的影响很大，而在硫化反应速率减缓区，则无明显影响；热解氢氧化物所得二氧化铈的硫化反应动力学方程为：Ｒ＝５７６．０．ｅｘｐ（－９０２９．０／Ｔ）．Ｃ０．３３６ｍｇ／（ｍｇ．ｍｉｎ）

The reaction kinetics of cerium oxide with sulphur dioxidehas been studied. The experimental results showed that the sulphuration kinetics was affected by the production process of cerium oxide, the sulphuration ability of cerium oxide decomposed thermally form cerium hydroxide was higher than that from cerium nitrate, and both of them were higher than that from cerium oxalate. The sulphuration reactionrate changed with the reaction time, it went up rapidly at first and then lowered slowly, and it changed greatly with the concentration of sulphur dioxide at first and then nearly was not influenced by the concentration. The sulphuration kinetics equation of cerium oxide decomposed thermally from corium hydroxide was:R=576.0 exp (-9029/T)C 0.3360 mg/(mg.min )