化工进展2017，Vol.36Issue(8)：2994-3001,8.DOI:10.16085/j.issn.1000-6613.2017-0118
不同方法制备氧化锌高温煤气脱硫剂的原位再生动力学
Kinetics study of zinc oxide sorbent prepared by different methods for hot coal gas desulfurization
摘要
Abstract
In this paper the different methods,such as ambient solid-state method and homogeneous precipitation method,were used to prepare the precursor of zinc oxide sorbent.The effects of reaction temperature and oxygen concentration on the in-situ regeneration of zinc oxide sorbent were investigated on the thermal balance device.Shrinking core model was employed to describe the kinetics of in-situ regeneration process of the precursor.The result showed that when the regeneration conversion rate was less than 80％,the regeneration reaction was mainly controlled by surface chemical reaction.When the regeneration conversion rate was higher than 85％,the regeneration reaction was mainly controlled by intra-particle diffusion.According to Arrhenius equation,the pre-exponential factors and activation energies of chemical reaction of the apparent reaction rate constant were 4.45rn/s,43.12kJ/mol for ambient solid-state method and 1.01m/s,65.76kJ/mol for homogeneous precipitation method,respectively.The effective diffusivity factor and apparent activation energy of internal diffusion of the ambient solid-state method were 5.42× 10-2m2/s and 38.38kJ/mol,and those of homogeneous precipitation method were 1.29× 10-3m2/s and 43.29kJ/mol,respectively.关键词
室温固相法/均匀沉淀法/氧化锌脱硫剂/原位/再生动力学Key words
ambient solid-state method/homogeneous precipitation method/zinc oxide sorbent/in-situ/regeneration kinetics分类
化学化工引用本文复制引用
冯宇,史磊,张赛赛,武蒙蒙,米杰..不同方法制备氧化锌高温煤气脱硫剂的原位再生动力学[J].化工进展,2017,36(8):2994-3001,8.基金项目
国家自然科学基金项目(51272170,21276172). （51272170,21276172）
