Preparation and kinetic analysis of Li_4SiO_4 sorbents with different silicon sources for high temperature CO_2 capture  

作　　者：SHANShaoYun JIAQingMing JIANGLiHong LIQinChao WANGYaMing PENGJinHui 

机构地区：[1]KunmingUniversityofScienceandTechnology,Kunming650093,China

出　　处：《Chinese Science Bulletin》2012年第19期2475-2479,共5页

基　　金：supported by the National Natural Science Fundation of China (51104075,50963004 and 31160146);the Natural Science Fund of Yunnan Province (2008B033M)

摘　　要：Using diatomite and analytical pure SiO2 as silicon sources,Li4SiO4 sorbents for high temperature CO2 capture were prepared through solid-state reaction method.Phase composition was analyzed by X-ray diffraction,and the CO2 absorption capacity and absorptoin-desorption performance were studied by the simultaneous thermal thermogravimetric analyzer(TG-DSC).The results showed that silicon source had an important influence on CO2 absorption properties.The kinetic parameters for the chemisorption and diffusion processes were obtained by the isothermal study for different silicon sources.The results showed that the activation energies for these two processes were estimated to be 105.427 and 35.928 kJ/mol for the sample with analytical pure SiO2(AS).While for the sample with diatomite(DS),the activation energies for these two processes were estimated to be 78.500 and 20.439 kJ/mol,respectively.Using diatomite and analytical pure SiO2 as silicon sources, Li4SiO4 sorbents for high temperature CO2 capture were prepared through solid-state reaction method. Phase composition was analyzed by X-ray diffraction, and the CO2 absorption capacity and absorptoin-desorption performance were studied by the simultaneous thermal thermogravimetric analyzer （TG-DSC）. The results showed that silicon source had an important influence on COz absorption properties. The kinetic parameters for the chemisorption and diffusion processes were obtained by the isothermal study for different silicon sources. The results showed that the activation energies for these two processes were estimated to be 105.427 and 35.928 kJ/mol for the sample with analytical pure SiO2 （AS）. While for the sample with diatomite （DS）, the activation energies for these two processes were estimated to be 78.500 and 20.439 kJ/mol, respectively.

关 键 词：二氧化碳 吸附剂 动力学分析 硅源 捕获 高温 TG-DSC X射线衍射分析 

分 类 号：TQ116.3[化学工程—无机化工] O647.33[理学—物理化学]