Facilely Synthesized M-Montmorillonite (M = Cr, Fe, and Co) as Efficient Catalysts for Enhancing CO₂ Desorption from Amine Solution

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

Facilely Synthesized M-Montmorillonite (M = Cr, Fe, and Co) as Efficient Catalysts for Enhancing CO₂ Desorption from Amine Solution

2021

Catalytic amine regeneration has recently emerged as an effective strategy to improve CO₂ desorption 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 CO₂ desorption 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 CO₂ desorption at low temperatures. Overall, the CO₂ desorption rate and the total amount of released CO₂ were 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 CO₂ desorption 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 CO₂ capture.

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