Abstract
A novel amine-modified pillar[5]arene bonded porous silica adsorbent(DETA-P5S)was designed to be applied to dynamic CO2 adsorption and selective separation of CO2 over N2 and CH4 gases mixture.The results demonstrated that reasonable introduction of DETA into the BE-P5 bonded silica support has sig-nificantly increased the adsorption capacity of CO2.The DETA-P5S has the optimal adsorption capacity of 9.1 mmol/g with 5 vol％CO2 at 40 ℃.The main reason of this increased capacity could be attributed to the enhanced CO2 diffusion into porous adsorbent for its better dispersion in the pores of amine-pillar[5]arene cavity and active site of DETA.Furthermore,the dynamic saturation adsorption capacities of DETA-P5S were 7.11(0.37)and 6.18(0.44)mmol/g for CO2/N2 and CO2/CH4,respectively,both the gas mixtures showed high separation selectivity.Simultaneously,the DETA-P5S can maintain outstanding CO2 adsorption capacity after fifteen regeneration cycles.Consequently,the designed DETA-P5S could serve as a promising adsorbent for CO2 capture and storage.
万方数据