✍ Scribed by O.V Komova; A.V Simakov; V.A Rogov; D.I Kochubei; G.V Odegova; V.V Kriventsov; E.A Paukshtis; V.A Ushakov; N.N Sazonova; T.A Nikoro
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Supported copper-titanium oxide catalysts have been studied by IR spectroscopy, XRD, UV-VIS diffuse reflectance spectroscopy, ESR, TPR with hydrogen and EXAFS. Different states of Cu 2q ions have been found on the surface of TiO .
The ratio between these states depends on the copper concentration and catalyst preparation method. Chain structures are formed due to the interaction of Cu 2q ions with TiO . Their concentration and geometry of their nearest oxygen 2 environment are determined by the structure of anatase faces. Some of these surface-stabilized Cu 2q ions are nucleation centers of oxide clusters. A noticeable growth of bulk CuO phase is observed after the completion of the formation of chain structures and oxide clusters. A quantitative estimation of the concentration of these copper forms in the catalysts is reported. For supported copper-titanium oxide catalysts, chain forms of Cu 2q ions are shown to be the most active forms of copper in NO SCR with ammonia and methane oxidation.
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