Inorganic Porous Nano Preparation And Characterization Of Composite Adsorbent

As the archcriminal of greenhouse effect, CO2 has serious efforts upon our life and environment. Carbon capture and storage is a technology of collect, transport, and storage for energy conservation and pollution reduction.Absorption separation technology was used owing to the acidic property of CO2. Four kinds of porous supports were choosen for coating alkaline-earth metal oxides, which were CNTs, ATP, silica gel and white carbon black.The hydrochloride used as precursor, the CNTs complex adsorbents were prepared by precipitate method, the ATP complex adsorbents were prepared by sol-gel method and the porous silica-based complex adsorbents were prepared by impregnation method. The efforts of metal salt concentration, calcine time, calcine temperature were investigated. Nanocomposite adsorbents were prepared in the best condition.The shape and absorption capacity of composite precursors and the composite powders were charaterized by means of SEM, XRD, FT-IR, BET, TG and grading analysis measurements.The experiment made that the CNTs complex adsorbents were loose and porous. The CO2 absorption capacity over CNTs/CaO composite was 16.61wt% in 750℃, CNTs/MgO composite was 6.09wt% in 50℃. TG was used to investgate the absorption and desorption capacity of CNTs/CaO composites under the condition of adsorption temperature and desorption temperature both 750℃,99.99%CO2. The CO2 absorption capacity over CNTs/CaO composite were 16.61wt% in the first cycle and 15.84% wt% in the second cycle. The result indicated that the composite had well cycle absorption capacity after two cycles.The experiment made that the ATP complex adsorbents were rodlike. The CO2 absorption capacity over ATP/CaO composite was 3.69wt% in 600℃, ATP/MgO composite was 3.93wt% in 50℃. Not only the properties of natural clay, non-pollution and low cost, but also the good absorption capacity made ATP complex adsorbents as a potential CO2 adsorbents in the future.The experiments made that the white carbon black complex adsorbents were like tiny orifice and the silica gel complex adsorbents were granulated. The CO2 absorption capacity over white carbon black/CaO composite was 1.69wt% in 750℃, white carbon black/MgO composite was 3.10wt% in 50℃. The CO2 absorption capacity over silica gel/CaO composite was 0.24wt% in 600℃, silica gel/MgO composite was 1.82wt% in 50℃. Because of the high specific surface and porosity, the CO2 absorption capacity of white carbon black complex adsorbents was better than the silica gel's.