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1. Recent advances in CO ₂ capture and reduction

   https://doi.org/10.1039/d2nr02894h  

   Wei, Kecheng; Guan, Huanqin; Luo, Qiang; He, Jie; Sun, Shouheng (August 2022, Nanoscale)

   Given the continuous and excessive CO 2 emission into the atmosphere from anthropomorphic activities, there is now a growing demand for negative carbon emission technologies, which requires efficient capture and conversion of CO 2 to value-added chemicals. This review highlights recent advances in CO 2 capture and conversion chemistry and processes. It first summarizes various adsorbent materials that have been developed for CO 2 capture, including hydroxide-, amine-, and metal organic framework-based adsorbents. It then reviews recent efforts devoted to two types of CO 2 conversion reaction: thermochemical CO 2 hydrogenation and electrochemical CO 2 reduction. While thermal hydrogenation reactions are often accomplished in the presence of H 2 , electrochemical reactions are realized by direct use of electricity that can be renewably generated from solar and wind power. The key to the success of these reactions is to develop efficient catalysts and to rationally engineer the catalyst–electrolyte interfaces. The review further covers recent studies in integrating CO 2 capture and conversion processes so that energy efficiency for the overall CO 2 capture and conversion can be optimized. Lastly, the review briefs some new approaches and future directions of coupling direct air capture and CO 2 conversion technologies as solutions to negative carbon emission and energy sustainability. 

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2. Amine-Grafted Silica Gels for CO ₂ Capture Including Direct Air Capture

   https://doi.org/10.1021/acs.iecr.9b05228  

   Anyanwu, John-Timothy; Wang, Yiren; Yang, Ralph T. (April 2020, Industrial & Engineering Chemistry Research)

   null (Ed.)
3. CO ₂ Capture by 2-(Methylamino)pyridine Ligated Aluminum Alkyl Complexes:

   https://doi.org/10.1002/ejic.202000437  

   Yokley, Timothy W.; Tupkar, Hrishikesh; Schley, Nathan D.; DeYonker, Nathan J.; Brewster, Timothy P. (May 2020, European Journal of Inorganic Chemistry)

   A set of novel, easily synthesized aluminum complexes, Al(κ2-N,N-2-(methylamino)pyridine)2R (R = Et, iBu) are reported. When subjected to 1 atm of CO2 pressure, each hemilabile pyridine arm dissociates and facilitates cooperative activation of the CO2 substrate reminiscent of a Frustrated Lewis Pair. This reaction has limited precedent for Al/N based Lewis Pair systems, and this is the first system readily shown to sequester multiple equivalents of CO2 per aluminum center. The ethyl variant then reacts further, inserting a third equivalent of CO2 into the aluminum alkyl to generate an aluminum carboxylate. Examples of this type of reactivity are rare under thermal conditions. A joint experimental/computational study validates the proposed reaction mechanism. 

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4. Viability of Vehicles Utilizing On-Board CO ₂ Capture

   https://doi.org/10.1021/acsenergylett.1c01426  

   Schmauss, Travis A.; Barnett, Scott A. (September 2021, ACS Energy Letters)
5. CO ₂ Capture and Direct Air CO ₂ Capture Followed by Integrated Conversion to Methane Assisted by Metal Hydroxides and a Ru/Al ₂ O ₃ Catalyst

   https://doi.org/10.1002/cctc.202300877  

   Koch, Christopher_J; Suhail, Zohaib; Goeppert, Alain; Prakash, G_K_Surya (October 2023, ChemCatChem)

   Abstract Rising CO₂levels are leading to an increase in atmospheric greenhouse gas effect. Hydroxide salts have previously been shown to be promising reagents for capturing CO₂. Utilizing a 5 %Ru/Al₂O₃catalyst, the carbonates obtained through CO₂capture can then be hydrogenated to methane. This conversion occurs at relatively mild temperatures from 200 °C to 250 °C under 40 to 70 bar H₂with yields of up to 100 %. Natural sources of calcium carbonate, like eggshells and seashells, can also be partially converted to methane. The direct air CO₂capture and conversion of CO₂to methane was achieved as well in quantitative yields. 

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