Dual function materials (Ru+Na2O/Al2O3) for direct air capture of CO2 and in situ catalytic methanation: The impact of realistic ambient conditions

Jeong-Potter, Chae; Abdallah, Monica; Sanderson, Cory; Gupta, Raghubir; Farrauto, Robert J.

doi:10.1016/j.apcatb.2021.120990

Cited by 49 publications

(23 citation statements)

References 22 publications

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“…This salt is then decomposed to form CO 2 again before the reaction occurs. 24,[35][36][37] As the catalysts used are generally air sensitive, this means that the catalyst in these bifunctional materials need to be regenerated under hydrogen during each adsorption/conversion cycle. This consumes part of the hydrogen and is rather energy intensive.…”

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confidence: 99%

Metal hydroxide assisted integrated direct air capture and conversion to methane with Ni/Al₂O₃catalysts

et al. 2023

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Metal hydroxide assisted integrated direct air capture and conversion to methane with Ni/Al₂O₃catalysts

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“…The effect of water is less investigated, and normally, cyclic tests are carried out in the presence of both O 2 and H 2 O during the adsorption feed. It is generally accepted that in flue gas application H 2 O competitively adsorbs onto the alkali sites of the DFM, decreasing CO 2 adsorption capacity. , For DAC applications, an increase of the CO 2 storage capacity at room temperature is observed in the presence of moisture on Na-based DFM, possibly due to the restructuring of Na allowing the formation of bicarbonate species at the investigated conditions …”

Section: Introductionmentioning

confidence: 95%

“…9,10 For DAC applications, an increase of the CO 2 storage capacity at room temperature is observed in the presence of moisture on Nabased DFM, possibly due to the restructuring of Na allowing the formation of bicarbonate species at the investigated conditions. 21 On these bases, starting from what we reported in a recent publication 9 where we compare the behavior of different alkaline materials and provide spectroscopic information on the CO 2 storage-reduction behavior of Ba-and K-based DFMs, the aim of this work is to deepen the understanding of the effect of operating conditions and in particular of the presence of O 2 and H 2 O on the behavior of a K-based DFM. In particular, by coupling microreactor experiments and in situ FT-IR characterization to get a comprehensive description of the storage-reduction behavior and on the effect of oxygen and water, in this work, we discuss the effect of different operating conditions and feed composition on a K-based DFM.…”

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confidence: 99%

Investigation of DFMs for CO₂ Capture and Methanation by Coupled Microreactor Experiments and FT-IR Spectroscopy

et al. 2023

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In this work, we discuss the role of different atmospheres and process conditions on the catalytic performances of Ru- and K/Ba-based dual-function materials (DFMs) for CO2 capture and methanation. By a combination of microreactor experiments and Fourier transform infrared (FT-IR) spectroscopy, we clarify the effect of temperature and H2 partial pressure during the hydrogenation step and the effect of water and oxygen during the CO2 adsorption step. In particular, we show that between 250 and 400 °C CO2 is rapidly adsorbed as bidentate carbonates on the basic sites (K or Ba) and as CO on Ru metal surfaces with decreasing storage capacity with increasing temperature. Increasing the operating temperature and the H2 partial pressure, the methanation rate of the bidentate carbonates increases. We also show that during the CO2 capture step, water not only reduces the amount of CO2 adsorbed by competitively adsorbing on basic sites but also changes the nature of the adsorbed carbonates, increasing their ionic character and hence their stability. This is observed in the case of both a K-based DFM and a Ba-based DFM, though in the case of the alkaline earth, the phenomenon is more evident. Finally, we point out that the presence of O2 during the CO2 capture step removes metallic Ru as CO adsorption site and reduces the amount of bidentate carbonates, possibly due to the additional presence of water formed upon Ru reduction in the methanation step. The information presented in this work is of interest to improve the design of DFMs to be used for flue gas, where the partial pressure of water and oxygen is relevant.

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“…The carbonation–methanation of 400 ppm CO 2 was conducted at the same temperature (320 °C) . The same group also determined that the CO 2 capture amount can be increased under humid conditions at ambient temperature and transformed into high amounts of CH 4 .…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Activated Direct Air Capture Methanation Using K-β″ Alumina

Lee

Otomo

2023

Ind. Eng. Chem. Res.

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400 ppm of CO 2 was captured with Ru/K 2 CO 3 on K-β″ alumina at 30 °C and was transformed into CH 4 successfully when the temperature was increased to 300 °C. K-β″ alumina was employed as the support material, and K + ions were designed to access Ru particles and induce the activation of adsorbed CO 2 . By the promotional effect, the K-β″ alumina-supported catalyst displayed a lower methanation temperature (120 °C) than the γ-Al 2 O 3 -supported one (150 °C). The K-β″ alumina-supported catalysts also exhibited high CH 4 selectivity (79%) and highly stable cyclic properties throughout the tests. Diffuse reflectance infrared Fourier transform spectroscopy revealed that K + in K-β″ alumina actively intervenes in the formation of intermediates (CO 3 2− and CO). The promotion in reactions will be due to σ → π K backdonation and can assist in their reactions to other intermediates (formate and carbonyl) at 120 °C. This implies that promotion of CH 4 intermediates' formation was aided by the conduction of K + in K-β″ alumina.

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Dual function materials (Ru+Na2O/Al2O3) for direct air capture of CO2 and in situ catalytic methanation: The impact of realistic ambient conditions

Cited by 49 publications

References 22 publications

Metal hydroxide assisted integrated direct air capture and conversion to methane with Ni/Al₂O₃catalysts

Metal hydroxide assisted integrated direct air capture and conversion to methane with Ni/Al₂O₃catalysts

Investigation of DFMs for CO₂ Capture and Methanation by Coupled Microreactor Experiments and FT-IR Spectroscopy

Low-Temperature Activated Direct Air Capture Methanation Using K-β″ Alumina

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Dual function materials (Ru+Na2O/Al2O3) for direct air capture of CO2 and in situ catalytic methanation: The impact of realistic ambient conditions

Cited by 49 publications

References 22 publications

Metal hydroxide assisted integrated direct air capture and conversion to methane with Ni/Al2O3catalysts

Metal hydroxide assisted integrated direct air capture and conversion to methane with Ni/Al2O3catalysts

Investigation of DFMs for CO2 Capture and Methanation by Coupled Microreactor Experiments and FT-IR Spectroscopy

Low-Temperature Activated Direct Air Capture Methanation Using K-β″ Alumina

Contact Info

Product

Resources

About

Metal hydroxide assisted integrated direct air capture and conversion to methane with Ni/Al₂O₃catalysts

Metal hydroxide assisted integrated direct air capture and conversion to methane with Ni/Al₂O₃catalysts

Investigation of DFMs for CO₂ Capture and Methanation by Coupled Microreactor Experiments and FT-IR Spectroscopy