A Simple Strategy to Improve PEI Dispersion on MCM-48 with Long-Alkyl Chains Template for Efficient CO2 Adsorption

Xingchi Qian, Junhao Yang, Zhaoyang Fei, Qing Liu, Zhuxiu Zhang, Xian Chen, Jihai Tang, Mifen Cui, Xu Qiao

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28 Scopus citations

Abstract

Polyethylenimine (PEI) impregnated MCM-48 samples without calcination (MCM-48-W) whose pores are covered with cetyltrimethylammonium bromide (CTAB with long-alkyl chains) were verified to be more efficient CO2 adsorbents than PEI impregnated conventional MCM-48 samples. The samples were characterized by thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), nitrogen adsorption-desorption, and Fourier transform infrared spectroscopy (FTIR) analysis. Also, CO2 adsorption behaviors including adsorption capacity, adsorption thermodynamics, and adsorbent stability were studied to reveal the CO2 adsorption performance on as-synthesized PEI supported materials. The experimental results indicated that the CO2 adsorption and amine efficiency of MCM-48-W were always higher than those of conventional MCM-48 samples at the same PEI loading. MCM-48-W impregnated with 40 wt % PEI (MCM-48-W(40)) exhibited 2.59 mmol·g-1 of CO2 adsorption capacity (6.9 mmol CO2/g PEI), the highest amine efficiency ever reported for MCM-48 impregnated PEI in pure CO2, which may be because the existence of long-alkyl chains improved the dispersion of PEI loading. We presented a simple strategy with the advantages of less consumption of PEI and omission of the calcination step for the improvement of PEI dispersion on MCM-48 with long-alkyl chains template for high efficiency CO2 adsorption.

Original languageEnglish
Pages (from-to)10975-10983
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume58
Issue number25
DOIs
StatePublished - 26 Jun 2019

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