负载型K_2CO_3/Al_2O_3二氧化碳吸收剂的碳酸化反应特性  

Carbonation characteristics of K_2CO_3/Al_2O_3 for CO_2 capture

作　　者：赵传文[1] 陈晓平[1] 赵长遂[1] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《化工学报》2009年第4期1022-1027,共6页CIESC Journal

基　　金：国家自然科学基金项目(50876021);国家重点基础研究发展计划项目(2006CB705806);江苏省普通高校研究生科研创新计划项目(CX08B141Z);东南大学优秀博士学位论文基金项目~~

摘　　要：The carbonation characteristics of K2CO3/Al2O3 supported sorbent for CO2 capture was investigated with thermogravimetric apparatus(TGA),X-ray diffraction(XRD),scanning electron microscopy analysis(SEM)and N2 adsorption.The results showed that the carbonation rate of K2CO3 before being loaded on Al2O3 was slow.However,the K2CO3/Al2O3supported sorbent showed excellent carbonation performance.The difference in carbonation behavior between K2CO3and K2CO3/Al2O3supported sorbent was analyzed from the microscopic view.The analytical reagent K2CO3 sample was of monoclinic crystal structure and could react quickly with H2O in the experimental carbonation environment to produce K2CO3·1.5H2O,which was unfavorable to carbonation reaction.When K2CO3was loaded on Al2O3,the surface area and porosity of the sorbent was improved greatly.So the carbonation properties of the K2CO3/Al2O3 supported sorbent was also improved.The carbonation characteristics of K2CO3/Al2O3 supported sorbent for CO2 capture was investigated with thermogravimetric apparatus （TGA）, X-ray diffraction （XRD）, scanning electron microscopy analysis （SEM） and N2 adsorption. The results showed that the carbonation rate of K2CO3 before being loaded on Al2O3 was slow. However, the K2CO3/Al2O3 supported sorbent showed excellent carbonation performance. The difference in carbonation behavior between K2CO3 and K2CO3/Al2O3 supported sorbent was analyzed from the microscopic view. The analytical reagent K2CO3 sample was of monoclinic crystal structure and could react quickly with H2O in the experimental carbonation environment to produce K2 CO3·1.5H2O, which was unfavorable to carbonation reaction. When K2 CO3 was loaded on ALO3, the surface area and porosity of the sorbent was improved greatly. So the carbonation properties of the K2CO3/Al2O2 supported sorbent was also improved.

关 键 词：CO2捕集 固体吸收剂 K2CO3/Al2O3 碳酸化反应 

分 类 号：X701.3[环境科学与工程—环境工程] TQ534.9[化学工程—煤化学工程]