Ion-exchanged montmorillonite as simple and effective catalysts for efficient CO2 capture

Bhatti, Umair H.; Sultan, Haider; Min, Gwan Hong; Nam, Sung Chan; Baek, Il Hyun

doi:10.1016/j.cej.2020.127476

Cited by 41 publications

(17 citation statements)

References 53 publications

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“…However, high regeneration heat is required in the traditional MEA technology due to an endothermic reaction of carbamate breakdown and a CO 2 desorption at 120°C in the stripper 3,4 . Especially, the thermal energy consumption in the desorption unit for regenerating MEA and stripping CO 2 , it accounts for approximately 70% of total operation cost 5 . Therefore, reducing the heat duty of CO 2 desorption will play a key role to implement the amine scrubbing technology into large‐scale commercial application.…”

Section: Introductionmentioning

confidence: 99%

Efficient nickel‐based catalysts for amine regeneration of CO₂ capture: From experimental to calculations verifications

et al. 2022

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High heat duty is an urgent challenge for industrial applications of amine‐based CO2 capture. The temperature (>110°C) of carbamate breakdown in amine regeneration requires large energy consumption. In this work, we report a novel, stable, efficient, and inexpensive Ni‐HZSM‐5 catalyst to improve the CO2 desorption rate and reduce the heat duty. The impregnation method was applied for varying nickel content in the catalysts from 2.16 to 9.80 wt% in HZSM‐5. The catalysts were characterized by scanning electron microscope, X‐ray powder diffraction, N2 adsorption–desorption, inductively coupled plasma‐optical emission spectrometry, ultraviolet‐visible diffuse reflectance spectroscopy, X‐ray photoelectron spectroscopy, NH3‐temperature programmed desorption (TPD), Infrared spectroscopy of pyridine adsorption, and Fourier transform infrared spectroscopy. The catalytic performance was evaluated by CO2 desorption of rich amine solvent at 90°C. It was found that the introduction of nickel increased the acid sites of catalysts compared with parent HZSM‐5. This phenomenon plays a key role on improving the CO2 desorption rate. The density functional theory (DFT) calculations successfully explain the catalytic performance. The catalytic activity associates with the combined properties of MSA × B/L × Ni2+. The 7.85‐Ni‐HZ catalyst presents an excellent catalytic activity for the CO2 desorption: it increases the amount of desorbed CO2 up to 36%, reduces the relative heat duty by 27.07% with the same reaction time, and possesses high stability during five cyclic tests. A possible catalytic mechanism for the Ni‐HZSM‐5 catalysts through assisting carbamate breakdown and promoting CO2 desorption is proposed based on experimental results and theoretical calculations. Therefore, the results present that the 7.85‐Ni‐HZ catalyst significantly accelerates the protons transfer in CO2 desorption and can potentially apply in industrial CO2 capture.

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Section: Introductionmentioning

confidence: 99%

Efficient nickel‐based catalysts for amine regeneration of CO₂ capture: From experimental to calculations verifications

et al. 2022

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“…Various solid metal oxides have been shown to optimize the CO 2 desorption rate, reducing the energy requirement of an aqueous alkanolamine solutions − (see Table S1 for comparison of metal oxide-aided regeneration of aqueous absorbents). Modified montmorillonite clay, zeolites, and metal-supported silicas − have also been demonstrated to successfully decompose the carbamate and improve the CO 2 desorption by up to 1000%, significantly increase the CO 2 desorption rate at low temperatures (<90 °C) and reduce the energy penalty by up to 44%. Though several catalysts have been reported to improve the sorbent regeneration, so far, the catalyst-aided desorption technique has remained limited to conventional aqueous solutions (30 wt % MEA in most cases), and less attention has been paid to understanding the catalytic activity during the regeneration process. − Now, as new classes of absorbents are rapidly gaining interest, it is crucial to investigate whether solid acid catalysts can assist the regeneration of nonaqueous solutions in the same way they assist the regeneration of aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Role of Metal Oxide Catalysts in the CO₂ Desorption Process from Nonaqueous Sorbents: An Experimental Study Carried out with ¹³C NMR

Bhatti

Ienco

Peruzzini

et al. 2021

ACS Sustainable Chem. Eng.

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The CO2 desorption process from a CO2-saturated nonaqueous sorbent, 2-(2-aminoethoxy)ethanol (DGA) in diethylene glycol monomethyl ether (DEGMME), was investigated in the absence and presence of four different metal oxides, namely, V2O5, TiO2, WO3, and ZnO, aiming at identifying acid catalysts with the potential to reduce the energy demand for sorbent regeneration. The desorption performances of the DGA-DEGMME solutions with and without catalysts were evaluated in terms of CO2 desorption rate, overall CO2 desorbed, and thermal energy consumption. The desorption mechanism was understood by the 13C NMR speciation study of the solutions during the regeneration experiments. As a result, metal oxide catalysts, depending on the number and types of acidic sites on their surface, can accelerate the carbamate breakdown and the subsequent CO2 release. In particular, WO3 and TiO2 can be considered good candidates for implementation in CO2 capture processes with nonaqueous sorbents, as they greatly improved the desorption performance, and their structures remain unchanged before and after use. The combination of nonaqueous sorbents with catalysts, here reported for the first time, provides an effective strategy that could inspire the design of advanced sorbents for energy-efficient CO2 capture.

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“…Currently, the clay minerals are gaining a growing interest for their applications in adsorption and catalysis mainly because of their easy availability, inexpensiveness, and tunable nature. − Montmorillonite (Mont) is inexpensive clay composed of aluminosilicate layers and cation interlayer. The structure of Mont can be easily optimized by a simple ion-exchange process that gives rise to the key catalytic properties such as total surface area, surface acidity, and mesoporosity. − For such reasons, it would be of great significance to tune Mont and use that as a heterogeneous catalyst to lower the temperature of amine regeneration.…”

Section: Introductionmentioning

confidence: 99%

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

Bhatti

Kazmi

Min

et al. 2021

Ind. Eng. Chem. Res.

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Catalytic amine regeneration has recently emerged as an effective strategy to improve CO 2 desorption at low temperatures. In this work, we synthesized inexpensive M-montmorillonite (M = Cr, Fe, and Co) catalysts via a facile metal ionexchange process and used these to optimize the CO 2 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 CO 2 desorption at low temperatures. Overall, the CO 2 desorption rate and the total amount of released CO 2 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 CO 2 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 CO 2 capture.

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Ion-exchanged montmorillonite as simple and effective catalysts for efficient CO2 capture

Cited by 41 publications

References 53 publications

Efficient nickel‐based catalysts for amine regeneration of CO₂ capture: From experimental to calculations verifications

Efficient nickel‐based catalysts for amine regeneration of CO₂ capture: From experimental to calculations verifications

Unraveling the Role of Metal Oxide Catalysts in the CO₂ Desorption Process from Nonaqueous Sorbents: An Experimental Study Carried out with ¹³C NMR

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

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Ion-exchanged montmorillonite as simple and effective catalysts for efficient CO2 capture

Cited by 41 publications

References 53 publications

Efficient nickel‐based catalysts for amine regeneration of CO2 capture: From experimental to calculations verifications

Efficient nickel‐based catalysts for amine regeneration of CO2 capture: From experimental to calculations verifications

Unraveling the Role of Metal Oxide Catalysts in the CO2 Desorption Process from Nonaqueous Sorbents: An Experimental Study Carried out with 13C NMR

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

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Product

Resources

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Efficient nickel‐based catalysts for amine regeneration of CO₂ capture: From experimental to calculations verifications

Efficient nickel‐based catalysts for amine regeneration of CO₂ capture: From experimental to calculations verifications

Unraveling the Role of Metal Oxide Catalysts in the CO₂ Desorption Process from Nonaqueous Sorbents: An Experimental Study Carried out with ¹³C NMR

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