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Plug flow reactor tests, in situ Fourier\u2010transform infrared, and X\u2010ray absorption spectroscopy demonstrate that a decrease in Cu loading shifts the reactivity\/redox profile to higher temperatures and increases the CH\n                    <jats:sub>3<\/jats:sub>\n                    OH selectivity and Cu\u2010efficiency. In situ electron paramagnetic resonance, Raman, ultraviolet\u2010visible, Fourier\u2010transform infrared, and photoluminescence spectroscopies reveal that this behavior is associated with the presence of monomeric Cu active sites, including bare Cu\n                    <jats:sup>2+<\/jats:sup>\n                    and [CuOH]\n                    <jats:sup>+<\/jats:sup>\n                    present at low Si\/Al ratio and Cu loading. Formation of two distinct [Cu\n                    <jats:sub>2<\/jats:sub>\n                    (\u03bc\u2010O)]\n                    <jats:sup>2+<\/jats:sup>\n                    moieties at higher Si\/Al ratio or Cu loading forces these trends into the opposite direction. Operando electron paramagnetic resonance and ultraviolet\u2010visible spectroscopy show that the apparent activation energy of monomeric Cu active species decreases with increasing Si\/Al ratio, whereas the one of dimeric centers is unaffected.\n                  <\/jats:p>","DOI":"10.1002\/anie.202411662","type":"journal-article","created":{"date-parts":[[2024,7,26]],"date-time":"2024-07-26T03:35:01Z","timestamp":1721964901000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Redox and Kinetic Properties of Composition\u2010Dependent Active Sites in Copper\u2010Exchanged Chabazite for Direct Methane\u2010to\u2010Methanol Oxidation"],"prefix":"10.1002","volume":"63","author":[{"given":"Andreas","family":"Brenig","sequence":"first","affiliation":[{"name":"Institute for Chemical and Bioengineering ETH Zurich  Vladimir-Prelog-Weg 1\u20135\/10 8093 Zurich Switzerland"},{"name":"Laboratory for Catalysis and Sustainable Chemistry Paul Scherrer Institute  Forschungsstrasse 111 5232 Villigen Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J\u00f6rg W. 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