论文部分内容阅读
The objective of this work is to examine the CO2 adsorption performance of “molecular basket” adsorbents prepared by loading organic amino compound on SBA-15 type mesoporous silica molecular sieve using impregnated method [1].Organic amino compounds,containing five kinds of polyethylene polyamines and three kinds of ethanol amines,have been chosen to prepare SBA-15-organic amine adsorbents.SBA-15 and all the adsorbents were characterized by X-ray powder diffraction (XRD) at low angles,N2 adsorption/desorption,thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM) to investigate their textural and thermal physical properties.The CO2 adsorption performance of the prepared SBA-15-organic amine adsorbents was investigated by using a fixed-bed flow system [2].The characterization results showed that after various organic amino compounds loading,each kind of compound was dispersed into the channels of SBA-15 with almost no change of the SBA-15 structure.The porous structure of SBA-15 could preserve and show a synergetic effect on the CO2 adsorption with amino groups.The adsorption measurement data demonstrated that the highest CO2 adsorption capacity in various adsorbents was obtained for SBA-15-TEPA-50 prepared by loading 50 wt % TEPA on SBA-15 support.The adsorption/desorption cycles indicated that SBA-15-TEPA-50 and SBA-15-PEI-50 had a good regenerability and stable adsorption performance.Due to the highest CO2 adsorption capacity,good regenerability and stable adsorption performance,TEPA was found to be the optimal organic amino compound among the investigated compounds,and SBA-15-TEPA-50 was a promising candidate for CO2 capture from flue gas.