Synthesis Of Amino-Functionalized Porous Molecular Sieve And Their CO₂-Adsorption Properties

The optimized experimental conditions such as organic amine concentration, concentration of EP, dipping mass ratio, etc were used in this article to improve the CO2 adsorption capacity of the amino functional porous molecular sieves at normal pressure. The porous material were characterized with the technology of infra-red spectrum, N2 adsorption/stripping, Elemental analysis, SEM and TG-DTA. The results are following:(1)The adsorption performance of amino modified calcium base type-5A molecular sieveThe epoxyresin(EP) was used as cross-linking agent, the calcium base 5A which coating PEI or TEPA were prepared by dipping method. The modified samples have ordered microporous structure when the mass ratio of PEI and molecular sieves is 15% and the mass ratio of EP and PEI is 1%. The modified samples still have ordered microporous structure, high pore volume and specific surface when the mass ratio of TEPA and molecular sieves is 30% and the mass ratio of EP and TEPA is 5%.At 333K, when the initial concentration of CO2 is 15%, TEPA is 15%, EP is 5% and the dipping mass ratio is 30%, the maximum of adsorption capacity CO2 of MCM-41 molecular sieve is 0.45mmol/g. Ten times cycling adsorption experiments of TEPA modified samples prove that modified samples have good adsorption performance.(2) The adsorption performance of amino modified MCM-41.The MCM-41 molecular sieves were used as the carrier, the EP was used as cross-linking agent, the PEI or TEPA were used as amino modifier for solid adsorption by dipping method. The modified samples have ordered mesoporous structure when the mass ratio of PEI and molecular sieves is 50% and the mass ratio of EP and PEI is 1%. The modified samples still have ordered microporous structure, high pore volume and specific surface when the mass ratio of TEPA and molecular sieves is 50% and the mass ratio of EP and TEPA is 20%.At 333K, when the initial concentration of CO2 is 15%, TEPA is 15%, EP is 5%, and the dipping mass ratio is 50%, the maximum adsorption capacity of CO2 is 3.28mmol/g. Ten times cycling adsorption experiments of TEPA modified samples prove that modified samples have good adsorption performance.