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Herein, we report a potassium\u2010promoted Ag\/Al\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    catalyst in which K acts as a bifunctional regulator of both the structural and electronic states of Ag. Combined spectroscopic characterization and density functional theory calculations reveal that K preferentially occupies surface hydroxyl groups on Al\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    that normally serve as anchoring sites for Ag. This competitive site occupation restricts Ag anchoring and drives the formation of metallic Ag nanoparticles with optimal size. Simultaneously, the strong electron\u2010donating nature of K creates a locally reducing environment that stabilizes metallic Ag under oxidative conditions. As a result, the 1Ag\u20102K catalyst achieves a\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>90<\/jats:sub>\n                    of 250\u00b0C and maintains 100% CO conversion over 10\u00a0h of continuous operation, while K\u2010modified catalysts all exhibit markedly enhanced resistance to H\n                    <jats:sub>2<\/jats:sub>\n                    O and SO\n                    <jats:sub>2<\/jats:sub>\n                    poisoning. These findings uncover a cooperative site\u2010occupation and electronic promotion mechanism of alkali metals, providing a general strategy for stabilizing active metal nanoparticles in heterogeneous catalysis.\n                  <\/jats:p>","DOI":"10.1002\/anie.3592125","type":"journal-article","created":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T05:38:17Z","timestamp":1790314697000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Site\u2010Occupation and Electron Donation by Potassium Enable Stable Metallic Silver Nanoparticles for Robust CO Oxidation"],"prefix":"10.1002","author":[{"given":"Yifei","family":"Liang","sequence":"first","affiliation":[{"name":"Faculty of Environmental Science and Engineering Kunming University of Science and Technology  Kunming China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhao","family":"Li","sequence":"additional","affiliation":[{"name":"Faculty 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