Facilely Synthesized M-Montmorillonite (M = Cr, Fe, and Co) as Efficient Catalysts for Enhancing CO2Desorption from Amine Solution

Umair H. Bhatti, Wajahat W. Kazmi, Gwan Hong Min, Junaid Haider, Sungchan Nam*, Il Hyun Baek*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (SciVal)


Catalytic amine regeneration has recently emerged as an effective strategy to improve CO2desorption at low temperatures. In this work, we synthesized inexpensive M-montmorillonite (M = Cr, Fe, and Co) catalysts via a facile metal ion-exchange process and used these to optimize the CO2desorption rate of a 30 wt % monoethanolamine (MEA) solution at a moderate temperature (∼86 °C). The metal ion-exchange process led to Si and Al leaching from the aluminosilicate layers and cation removal from the Mont interlayers, resulting in an increase in the surface acidity, mesoporosity, and total surface area of the ion-exchanged Mont catalysts. The prepared catalysts introduce acid sites to amine solution that can attach with the carbamate, carbonate, and bicarbonates, to favor the CO2desorption at low temperatures. Overall, the CO2desorption rate and the total amount of released CO2were improved up to 315 and 82.5%, respectively, whereas the regeneration energy penalty was reduced by 40%, in comparison with the noncatalytic MEA solution. The impact of various physicochemical catalytic properties on the CO2desorption performance was also evaluated. The stability of the prepared catalysts was verified in five cyclic uses and no change in the catalytic activity or structure was detected. In addition, the catalysts were readily separable by simple filtration. This work introduces an effective strategy to design abundant and cost-effective catalysts for energy-efficient CO2capture.

Original languageEnglish (US)
Pages (from-to)13318-13325
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Issue number36
StatePublished - Sep 15 2021

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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