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Herein, the mineral products formed by capture of atmospheric CO\n                    <jats:sub>2<\/jats:sub>\n                    by potassium hydroxide (KOH) in aqueous, aqueous\u2010ethanol, and aqueous\u2010acetone solutions, and aqueous\u2010acetone enriched using solid CO\n                    <jats:sub>2<\/jats:sub>\n                    are studied. A multimodal analysis combining single\u2010crystal X\u2010ray diffraction (SCXRD), powder X\u2010ray diffraction (PXRD), with Pawley and Rietveld refinements, and 850\u2009MHz, 1\u2009GHz, and 1.2\u2009GHz\u00a0\n                    <jats:sup>1<\/jats:sup>\n                    H, as well as\n                    <jats:sup>13<\/jats:sup>\n                    C, and\n                    <jats:sup>39<\/jats:sup>\n                    K nuclear magnetic resonance (NMR), is used to analyze the composition of the mineral products. SCXRD identifies KHCO\n                    <jats:sub>3<\/jats:sub>\n                    in space group\n                    <jats:italic>P<\/jats:italic>\n                    2\n                    <jats:sub>1<\/jats:sub>\n                    \/\n                    <jats:italic>n<\/jats:italic>\n                    (transformable to\n                    <jats:italic>P<\/jats:italic>\n                    2\n                    <jats:sub>1<\/jats:sub>\n                    \/\n                    <jats:italic>a<\/jats:italic>\n                    ) 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\n                    <jats:sub>3<\/jats:sub>\n                    and K\n                    <jats:sub>2<\/jats:sub>\n                    CO\n                    <jats:sub>3<\/jats:sub>\n                    and its hydrates, with KOH as a minor component, except for aqueous\u2010ethanol which gives KHCO\n                    <jats:sub>3<\/jats:sub>\n                    in high purity. Analysis of complex\n                    <jats:sup>1<\/jats:sup>\n                    H NMR data is aided by 2D nuclear Overhauser effect spectroscopy (1\u2009GHz), which characterizes C\uf8ffOH\u00b7\u00b7\u00b7O\uf8feC interactions. Revealing K\n                    <jats:sub>2<\/jats:sub>\n                    CO\n                    <jats:sub>3<\/jats:sub>\n                    hydration is aided by deconvolution of ultrahigh\u2010field 28.2 T (56\u2009MHz)\n                    <jats:sup>39<\/jats:sup>\n                    K spectra. This multimodal approach provides new insights into the speciation of potassium minerals from CO\n                    <jats:sub>2<\/jats:sub>\n                    capture.\n                  <\/jats:p>","DOI":"10.1002\/open.202500376","type":"journal-article","created":{"date-parts":[[2025,10,14]],"date-time":"2025-10-14T12:49:58Z","timestamp":1760446198000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Mineral Speciation for CO\n                    <sub>2<\/sub>\n                    Captured by Potassium Hydroxide"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4436-8371","authenticated-orcid":false,"given":"Ehsan","family":"Ezzatpour Ghadim","sequence":"first","affiliation":[{"name":"School of Engineering University of Warwick  Coventry CV4 7AL 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