包硅改性纳米碳酸钙应用于高温CO_2吸附的性能  

Performance of nano-CaCO_ 3 coated with SiO_2 on CO_2 adsorption at high temperature

作　　者：吴嵘[1] 吴素芳[1] 

机构地区：[1]浙江大学材料与化工学院,浙江杭州310027

出　　处：《化工学报》2006年第7期1722-1726,共5页CIESC Journal

基　　金：国家留学回国基金项目[2004(176)].~~

摘　　要：Nano-CaCO3 particles were surface-coated with SiO2 by the sol-gel method and used as the high temperature CO2 adsorption material.CaCO3 samples prepared at 60—90℃ were characterized with TEM, EDS and XRD methods and the initial and final decomposition temperature were determined with TGA.The CO2 adsorption ratio and carbonation-calcination characteristics were evaluated in a 12 mm fixed bed reactor.The analytical results showed that there was an amorphous SiO2 film formed on the surface of nano-CaCO3,and the atomic ratio of Si to Ca is 1∶39.The initial and final decomposition temperatures were 595—620℃ and 800—820℃ respectively.The maximum CO2 adsorption ratio of SiO2 coated with nano-CaCO3 was 92.1% at 600℃with a 10% increase as compared with the uncoated nano-CaCO3 particles.After 20 cyclic carbonation and calcination runs, CO2 adsorption ratio of the SiO2 coated samples was 63%.The XRD analysis illustrated that the crystal type of nano-CaCO3 had no change after 20 cyclic runs.Nano-CaCO3 particles were surface-coated with SiO2 by the sol-gel method and used as the high temperature CO2 adsorption material. CaCO3 samples prepared at 60-90℃ were characterized with TEM, EDS and XRD methods and the initial and final decomposition temperature were determined with TGA. The CO2 adsorption ratio and carbonation-calcination characteristics were evaluated in a 412 mm fixed bed reactor. The analytical results showed that there was an amorphous SiO2 film formed on the surface of nano-CaCO3, and the atomic ratio of Si to Ca is 1：39. The initial and final decomposition temperatures were 595-620℃ and 800-820℃ respectively. The maximum CO2 adsorption ratio of SiO2 coated with nano-CaCOs was 92.1% at 600℃ with a 10% increase as compared with the uncoated nano-CaCOs particles. After 20 cyclic carbonation and calcination runs, CO2 adsorption ratio of the SiO2 coated samples was 63%. The XRD analysis illustrated that the crystal type of nano-CaCO3 had no change after 20 cyclic runs.

关 键 词：纳米氧化钙 包硅处理 分解温度 高温吸附 吸附容量 循环稳定性 

分 类 号：TQ132.32[化学工程—无机化工]