Year: 2025
Type: article
Abstract: Capture of greenhouse gases, especially CO 2 , can reduce the effects of global warming and generate valuable minerals as feedstock for industry. Herein, the mineral products formed by capture of atmospheric CO 2 by potassium hydroxide (KOH) in aqueous, aqueous‐ethanol, and aqueous‐acetone solutions, and aqueous‐acetone enriched using solid CO 2 are studied. A multimodal analysis combining single‐crystal X‐ray diffraction (SCXRD), powder X‐ray diffraction (PXRD), with Pawley and Rietveld refinements, and 850 MHz, 1 GHz, and 1.2 GHz 1 H, as well as 13 C, and 39 K nuclear magnetic resonance (NMR), is used to analyze the composition of the mineral products. SCXRD identifies KHCO 3 in space group P 2 1 / n (transformable to P 2 1 / a ) as a product from all reactions. PXRD and NMR data show the presence of both crystalline and amorphous phases in products, predominantly as mixtures of KHCO 3 and K 2 CO 3 and its hydrates, with KOH as a minor component, except for aqueous‐ethanol which gives KHCO 3 in high purity. Analysis of complex 1 H NMR data is aided by 2D nuclear Overhauser effect spectroscopy (1 GHz), which characterizes COH···OC interactions. Revealing K 2 CO 3 hydration is aided by deconvolution of ultrahigh‐field 28.2 T (56 MHz) 39 K spectra. This multimodal approach provides new insights into the speciation of potassium minerals from CO 2 capture.
Source: ChemistryOpen
Institutions: University of Warwick, Universidade Federal de Ouro Preto
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
SDG: Climate action
Open Access status: gold
Estimated APC paid: $2,790
Funders: Advantage West Midlands, University of Warwick, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação de Amparo à Pesquisa do Estado de Minas Gerais, Engineering and Physical Sciences Research Council, Biotechnology and Biological Sciences Research Council, European Regional Development Fund
Awards: Multi-User Equipment to Refresh Underpinning Analytical Capabilities at the University of Warwick, EPRSC Resource Only Strategic Equipment: the Warwick Analytical Science Centre, G3716179185, Warwick Centre for Analytical Science, The UK High-Field Solid-State NMR National Research Facility, G7633989764, NMR at 1.2 GHz: A World-Leading UK Facility to Deliver Advances in Biology, Chemistry, and Materials Science, Solid-State NMR at 1.0 GHz: A World-Leading UK Facility to Deliver Advances in Chemistry, Biology and Materials Science, G8435462311, G88650762, G987229451
OpenAlex ID: W4415149886