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- Title
Pentaethylenehexamine-Loaded Hierarchically Porous Silica for CO<sub>2</sub> Adsorption.
- Authors
Changchun Ji; Xin Huang; Lei Li; Fukui Xiao; Ning Zhao; Wei Wei
- 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.
- Subjects
AMINES; POROUS silica; MACROPORES (Catalysis); CARBON sequestration; MESOPORES
- Publication
Materials (1996-1944), 2016, Vol 9, Issue 10, p835
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma9100835