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Utilisation of CO2 as “Structure Modifier” of Inorganic Solids

Francesconi, M. Grazia; Bennett, Matthew J; Benoit, David; Dobson, Ian

Authors

Matthew J Bennett

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Dr David Benoit D.Benoit@hull.ac.uk
Senior Lecturer in Molecular Physics and Astrochemistry

Ian Dobson



Abstract

Utilisation of CO2 as a chemical reagent is challenging, due to the molecule’s inherent chemical stability. However, CO2 reacts promptly at high temperature (~1000 C) with alkaline-earth oxides to form carbonates and such reactions are used towards capture and re-utilisation. In this work, this concept is extended and CO2 is utilised as a reagent to modify the crystal structure of mixed-metal inorganic solids. Modification of the crystal structure is a “tool” used by materials scientists to tailor the physical property of solids. CO2 gas was reacted with several isostructural mixed-metal oxides Sr2CuO3, Sr1.8Ba0.2CuO3 and Ba2PdO3. These oxides are carefully selected to show anion vacancies in their crystal structure, to act as host sites for CO2 molecules, leading to the formation of carbonate anions, (CO3)2. The corresponding oxide carbonates were formed successfully and the favourable formation of SrCO3 as secondary phase was minimised via an innovative, yet simple synthetic procedure involving alternating of CO2 and air. We also derived a simple model to predict the kinetics of the reactions for the cuprates, using first-principles density functional theory and assimilating the reaction to a gas–surface process.

Citation

Francesconi, M. G., Bennett, M. J., Benoit, D., & Dobson, I. (2022). Utilisation of CO2 as “Structure Modifier” of Inorganic Solids. Chemistry: a European journal, 28(6), Article e202103608. https://doi.org/10.1002/chem.202103608

Journal Article Type Article
Acceptance Date Dec 8, 2021
Online Publication Date Dec 21, 2021
Publication Date Jan 27, 2022
Deposit Date Feb 2, 2022
Publicly Available Date Dec 22, 2022
Journal Chemistry - A European Journal
Print ISSN 0947-6539
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 28
Issue 6
Article Number e202103608
DOI https://doi.org/10.1002/chem.202103608
Keywords Carbon dioxide fixation; Intercalation; Main groups elements; Perovskite phases; Transition metals
Public URL https://hull-repository.worktribe.com/output/3884577

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