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Our idea is based on the high sensitivity of the luminescence spectra of Eu\n                    <jats:sup>3+<\/jats:sup>\n                    ions, doped into CeO\n                    <jats:sub>2<\/jats:sub>\n                    , to the local environment of cationic centers. High sensitivity, together with the relatively low cost of this method, could be demanded in industrial conditions for fast monitoring of the Ce\n                    <jats:sup>4+<\/jats:sup>\n                    \/Ce\n                    <jats:sup>3+<\/jats:sup>\n                    ratio in ceria support. NAP\u2010XPS and H\n                    <jats:sub>2<\/jats:sub>\n                    \u2010TPR were used as reference techniques to determine the actual chemical state of the Ru\/ceria catalyst under working conditions, necessary to calibrate luminescent data.\n                  <\/jats:p>","DOI":"10.1002\/cphc.70580","type":"journal-article","created":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T05:33:07Z","timestamp":1791437587000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The Eu\n                    <sup>3+<\/sup>\n                    \u2010Based Luminescent Marker\u2014A Powerful Tool for Fast Monitoring of Ce\n                    <sup>4+<\/sup>\n                    \/Ce\n                    <sup>3+<\/sup>\n                    Transitions in Ru\/Ceria\u2010Based Catalysts"],"prefix":"10.1002","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7069-9748","authenticated-orcid":false,"given":"Oleksii","family":"Bezkrovnyi","sequence":"first","affiliation":[{"name":"W. 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