Experimental investigation of CO2 adsorption and desorption on multi-type amines loaded HZSM-5 zeolites

Huaigang Cheng, Huiping Song, Sam Toan, Baofeng Wang, Khaled A.M. Gasem, Maohong Fan, Fangqin Cheng

Research output: Contribution to journalArticlepeer-review

Abstract

Solid adsorbents were prepared by fixing amines to HZSM-5 zeolites via wet impregnation method, and the CO2 adsorption properties were investigated in a fixed-bed adsorption system followed by the structural, thermodynamic and kinetic studies. The HZSM-5 with 25 in Si/Al ratio and ~2.3 μm in average particle size was found to be a favourable CO2 adsorbent support; whereby CO2 adsorbents supporting monoethanolamine (MEA) and hydroxyethyl ethylenediamine (AEEA) exhibited good CO2 adsorption capacities, with maximum values of 4.27 and 4.44 mmol/g being achieved, respectively. Desorption kinetics and thermodynamic studies showed that the CO2 desorption process of AEEA loaded HZSM-5 exhibited a low activation energy of 54.27 kJ/mol. This low activation energy attributes to two possible reasons: HZSM-5 zeolite provides a large number of free H+ ions, which directly participate in carbamate breakdown; HZSM-5 can also provide metal atoms (Al) that attach to the N atom of carbamate, thereby stretching the C-N bond and promoting decomposition. Furthermore, the AEEA loaded HASM-5 adsorbent has high adsorption-desorption stability in the regeneration cycle tests, revealing the energy efficiency of the CO2 desorption process and low CO2 capture cost.

Original languageEnglish (US)
Article number126882
JournalChemical Engineering Journal
Volume406
DOIs
StatePublished - Feb 15 2021

Bibliographical note

Funding Information:
This work was financially supported by National Key R&D Program of China ( 2018YFB0605804 ) and the Foundation of NSFC-Shanxi Coal-based Low Carbon Joint Fund ( U1610254 ).

Keywords

  • Carbon dioxide
  • HZSM-5
  • Hydroxyethyl ethylenediamine (AEEA)
  • Monoethanolamine (MEA)
  • Sorbent
  • Zeolite

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