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Pentaethylenehexamine-Loaded Hierarchically Porous Silica for CO2 Adsorption

by Changchun Ji 1,2, Xin Huang 1,2, Lei Li 1, Fukui Xiao 1,3, Ning Zhao 1,3,* and Wei Wei 4,*
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, 27th South Taoyuan Road, Taiyuan 030001, China
University of Chinese Academy of Sciences, Beijing 100049, China
National Engineering Research Center for Coal-Based Synthesis, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
Center for Greenhouse Gas and Environmental Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201203, China
Authors to whom correspondence should be addressed.
Academic Editor: Sofoklis Makridis
Materials 2016, 9(10), 835;
Received: 15 August 2016 / Revised: 25 September 2016 / Accepted: 8 October 2016 / Published: 15 October 2016
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. View Full-Text
Keywords: CO2 capture; hierarchically porous silica; pentaethylenehexamine CO2 capture; hierarchically porous silica; pentaethylenehexamine
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MDPI and ACS Style

Ji, C.; Huang, X.; Li, L.; Xiao, F.; Zhao, N.; Wei, W. Pentaethylenehexamine-Loaded Hierarchically Porous Silica for CO2 Adsorption. Materials 2016, 9, 835.

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