摘要
用微量热天平研究了氧化锌脱除 COS 过程中的催化加氢效应。在240～400℃的实验温区,这一过程按直接吸收及催化加氢吸收两种机理进行。吸收动力学行为可用类似未反应收缩核模型描述,并对 COS 具有一级反应特征。催化加氢使 COS 转化为 H_2S 再被吸收从而降低了反应能垒,成倍地加速了吸收过程的进行。吸收本身对 H_2为一级反应。分别给出了各反应速率常数的表征式及对应的活化能值。
The role of catalytic hydrogenolysis in COS removal with ZnO has been inves- tigated by using a microthermobalance.It was shown that in the temperature range of 240～ 400℃,this desulfurization involves a dual process of direct absorption and absorption through catalytic hydrogenolysis.The kinetic behavior of direct absorption can be simulated by a shrinking unreacted core model in reaction control regime,and described by the expres- sion: 1-(1-x)^(1/3)=1.247·10~2 exp((27000)/(8.314T))C_(AOτ) Carbonyl sulfide hydrogenolysis is first order with respect to both COS and H_2.Its rate ex- pression is: (dC^(H_2S))/(dτ_O)=3.457·10~5exp((8580)/(8.314T))C_(AO)C_(BO) In the presence of H_2,the absorption of COS could be accelated by catalytic hydrogenolysis. Its kinetic behavior is described by 1-(1-x)^(1/3)=1.247·10~2 exp((27000)/(8.314T))C_(AOτ) Where the enhancement factor A is defined as A=60.73C_(BO)exp((5480)/(8.314T))τ。
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1993年第3期261-270,共10页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金
关键词
热重法
羰基硫
脱硫
动力学
氧化锌
thermogravimetric method
carbonyl sulfide
desulfurization
kinetics
zinc oxide
