阳离子交换时长与CO2吸附性能的关联性OA

The regulation of metal cations in zeolites via ion exchange to enhance CO2 adsorption performance holds significant potential for the efficient industrial capture of CO2.To investigate the correlation between metal cation exchange time and CO2 adsorption performance of zeolites,four adsorbent samples(e.g.Ca-LTA-30)were prepared with exchange time as the independent variable.The textural properties,thermal stability,CO2 temperature-programmed desorption(CO2-TPD),and CO2 adsorption performance of these samples were characterized.Furthermore,the IAST(Ideal Adsorbed Solution Theory)selectivity of these samples for CO2/N2 gas mixtures with different volume ratios(20:80,50:50,80:20)was compared.The results indicate that the CO2 adsorption performance of LTA can be increased from 5.02 mmol/g to 6.05 mmol/g,while the SCO2/N2 can be improved from 59.7 to 118.5.In addition,through comparing the fitting performance of four adsorption models on the adsorption isotherms of CO2 and N2 on LTA and Ca-LTA series samples,it is found that the Langmuir-Freundlich model exhibits the best consistency with the experimental data and can effectively evaluate the CO2 adsorption behavior of the Ca-LTA series samples.