Carbon Dioxide Composite Adsorbent Preparation And Properties Of

Making full use of good adsorption materials is one of the important topics to achieve CO2 separation recycling in the study of CO2 emissions. This paper used activated carbon, nano SiO2, silica gel as the carrier, compound into new adsorbents to study the effect of pure CO2 adsorption. Mainly for the following three areas of research:PAM/AC, PAM/SiO2 and PAM/SG were synthesized by in-suit dispersion polymerization. The structure and properties of samples were determined by FTIR, SEM, N2 adsorption-desorption and TGA characterization method. Thermogravimetry at 60 degrees under continuous adsorption for 60 min measured adsorption capacity. The CO2 adsorption capacity of activated carbon, nano-SiO2, silica gel followed by 62mg/g,31mg/g,71mg/g, The composited adsorption capacity were obviously increased, the adsorption effect: PAM/SG>PAM/AC> PAM/SiO2. When mass ratio of silica gel and monomer was 1:1, the adsorption capacity of PAM/SG could achieve 256mg/g, regeneration performance was good, after six cycles, the adsorption capacity was still up to 235mg/g. Absorption mechanism was from physical adsorption to chemical adsorption.Cu/AC samples were synthesized with different amount of formaldehyde concentration and load capacity by chemical plating method. The results of XRD SEM and TGA characterization indicated that AC surface was covered with bronze successfully. Adsorption performance of synthesized samples were increased, and could completely desorption at 100℃. The reaction time was short under the conditions of formaldehyde 60mL/L, load capacity 1 Og/L, also, powder surface copper plating uniformity, no Cu2O peak, the adsorption capacity was 79mg/g, the sixth cycles for 70mg/g, adsorption cycle stability was good.The metal salt solution of LiNO3, Ca(Ac)2, Cu(NO3)2 were impregnated AC, nano-SiO2 to synthetic new materials. XRD and SEM characterization results showed that new materials were loaded.700℃for adsorption experiments showed that absorption capacity of composite had all been improved. Influence on the adsorption properties from strong to weak order: loading>calcining temperature>calcining time. The optimal synthetic conditions was calcining at 900℃for 9h, Adsorption capacity of CaO/AC, LiO/SiO2 prepared under this conditions respectively reached 263mg/g,124mg/g. Adsorption capacity was not reduced after four times recycling, composite sample adsorption mechanism was chemical adsorption.