Date of Publication:2022-10-04

Journal:燃料化学学报

Issue:4

Page Number:484-490

ISSN No.:0253-2409

Abstract:The metal-organic framework MIL-101 ( Cr ) was synthesized via hydrothermal process and then modified with pentaethylenehexamine ( PEHA) through refluxing in ethanol. Various measures such as SEM, XRD, N2 sorption, Elemental analysis and FT-IR were used to characterize the structure, morphology and properties of PEHA-grafted MIL-101(Cr). Meanwhile, the performance of PEHA-grafted MIL-101(Cr) in CO2 adsorption was investigated under 25 ℃. The results illustrate that the loading of PEHA in MIL-101 ( Cr ) can conspicuously enhance the CO2 adsorption capacity. PEHA-grafted MIL-101 ( Cr ) with a PEHA loading of 0. 24 mL exhibits the highest capacity for CO2 adsorption;the adsorption capacity reaches 58. 944 mg/g at 25℃and atmospheric pressure, which is 33% higher than that of the unmodified MIL-101(Cr) (44. 208 mg/g). In addition, the CO2 adsorption capacities on both MIL-101(Cr) and PEHA-MIL-101(Cr) are greatly enhanced by increasing pressure, reaching 1147. 59 and 1256. 74 mg/g at 1. 1 MPa, respectively. These results suggest that PEHA-modified MIL-101(Cr) could be a good candidate adsorbent for CO2 capture at high pressure.

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