Abstract
Recently, amine-functionalized materials as a prospective chemical sorbent for post combustion CO2 capture have gained great interest. However, the amine grafting for the traditional MCM-41, SBA-15, pore-expanded MCM-41 or SBA-15 supports can cause the pore volume and specific surface area of sorbents to decrease, significantly affecting the CO2 adsorption-desorption dynamics. To overcome this issue, hierarchical porous silica with interparticle macropores and long-range ordering mesopores was prepared and impregnated with pentaethylenehexamine. The pore structure and amino functional group content of the modified silicas were analyzed by scanning electron microscope, transmission electron microscope, N2 adsorption, X-ray powder diffraction, and Fourier transform infrared spectra. Moreover, the effects of the pore structure as well as the amount of PEHA loading of the samples on the CO2 adsorption capacity were investigated in a fixed-bed adsorption system. The CO2 adsorption capacity reached 4.5 mmol CO2/(g of adsorbent) for HPS−PEHA-70 at 75 °C. Further, the adsorption capacity for HPS-PEHA-70 was steady after a total of 15 adsorption-desorption cycles.
Highlights
To date, carbon capture and storage (CCS) technology has been established as a main and efficient solution to resolve global warming and climate change issues [1,2,3,4]
Transmission electron microscopy (TEM) images of samples were obtained on a JEOL 2010 microscope (JEOL, Beijing, China) operated at 200 kV
According to Smatt et al [48], the material synthesis can be divided into four steps (Scheme 1)
Summary
Carbon capture and storage (CCS) technology has been established as a main and efficient solution to resolve global warming and climate change issues [1,2,3,4]. Compared with solvent absorption and membrane separation, solid adsorption has many potential advantages for CO2 capture, such as high capacity, good selectivity, and easy processing [13]. Gargiulo et al revealed that the pore size can affect the CO2 adsorption capacity by comparing the PEI functionalized mesoporous MCM-48 and SBA-15 [39]. Qi et al exploited high efficient CO2 capture nanocomposite sorbent on the basis of oligomeric amine-functionalized mesoporous capsules [43]. These mesoporous materials had relatively low adsorption capacity in flue gas because of the small pore diameter. It was found that the temperature and the PEHA amount supported on the porous silica obviously affected the sorption behavior
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