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Binding sites, oxygen and vanadium, at both the perfect and reduced surface are considered where reduction is modeled by (sub-) surface oxygen vacancies. The reactants are found to bind overall more strongly at oxygen vacancy sites of the reduced surface where they stabilize in positions formerly occupied by the oxygen (substitutional adsorption) compared with weaker binding at the perfect surface. In particular, ammonia, which interacts only weakly with vanadium at the perfect surface, binds quite strongly near surface oxygen vacancies. In contrast, surface binding of the NH4 adsorbate species differs only little between the perfect and the reduced surface which is explained by the dominantly electrostatic nature of the adsorbate interaction. The theoretical results are consistent with experimental findings and confirm the importance of surface reduction for the reactant adsorption forming elementary steps of the SCR process.<\/jats:p>","DOI":"10.1063\/1.4793709","type":"journal-article","created":{"date-parts":[[2013,3,7]],"date-time":"2013-03-07T23:42:24Z","timestamp":1362699744000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":10,"title":["Elementary steps of the catalytic NOx reduction with NH3: Cluster studies on reactant adsorption at vanadium oxide substrate"],"prefix":"10.1063","volume":"138","author":[{"given":"M.","family":"Gruber","sequence":"first","affiliation":[{"name":"Fritz-Haber-Institut der Max-Planck-Gesellschaft Inorganic Chemistry Department, , Faradayweg 4-6, 14195 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K.","family":"Hermann","sequence":"additional","affiliation":[{"name":"Fritz-Haber-Institut der Max-Planck-Gesellschaft Inorganic Chemistry Department, , Faradayweg 4-6, 14195 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2013,3,7]]},"reference":[{"key":"2023062004023128200_c1","volume-title":"The Surface Science of Metal Oxides","year":"1994"},{"key":"2023062004023128200_c2","first-page":"136","volume-title":"The Chemical Physics of Solid Surfaces","author":"Woodruff","year":"2001"},{"key":"2023062004023128200_c3","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1016\/S0926-860X(97)80165-2","volume":"157","year":"1997","journal-title":"Appl. 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