Реферат: Copper-​titanium oxide (Cu-​Ti-​O) catalysts are high active for complete oxidation of CO and hydrocarbons and selective catalytic reduction (SCR) of NO. So, they are promising in complex purification of exhaust industrial gases. Unfortunately, in the literature there are practically no reports of systematic investigation of the effect of the catalyst preparation method and support structure on the state of Cu2+ ions stabilized on the anatase surface. In the present work results of the study of a series of Cu-​Ti-​O catalysts by various physicochemical methods (IR spectroscopy, XRD, UV-​visible diffuse reflectance spectroscopy, ESR, TPR with hydrogen and EXAFS) are reported, and the effect of the structure of the support surface, the catalyst preparation method and surface copper oxidation on the states of Cu2+ ions is discussed. Our study revealed that the state of copper oxide forms on the TiO2 surface is detected by titania surface structure, the copper oxidation and the catalyst preparation method. At low copper oxidations Cu2+ ions preferably interact with low-​coordinated oxygen atoms of the anatase lattice with the formation of chain structures of variable length with low no. of isolated Cu2+ ions. The oxidation of these forms and the geometry of the nearest oxygen environment of Cu2+ ions are detected by the structure of TiO2 faces. The most energetically favorable structures are formed on face (001)​. As the copper oxidation grows, some of the surface oxide copper-​titania forms become nucleation centers of oxide clusters. The size of the latter seems to be limited by the size of anatase pores. Noticeable growth of bulk CuO phase takes place after completion of the formation of surface-​stabilized Cu2+ ions and oxide clusters. The ratio of the forms of copper can be changed in favor of more energetically favorable ones by the application of another preparation method-​equil. adsorption technique. The investigation performed made it possible to make quantitative evaluation of the contents of different copper forms on the anatase surface and show that surface-​stabilized chain forms of Cu2+ ions are most active in the CH4 oxidation and NO SCR with ammonia.

Библиографическая ссылка: Simakov A.V. , Komova O.V. , Rogov V.A. , Kochubei D.I. , Odegova G.V. , Kriventsov V.V. , Paukshtis E.A. , Ushakov V.A. , Sazonova N.N. , Nikoro T.A.
Active Copper Species in Supported Copper-​Titanium Oxide Catalysts
В сборнике Abstracts of Papers, 222nd ACS National Meeting, Chicago, IL, United States, August 26-30, 2001. 2001. – C.U344-U344. WOS CAPlus

Даты:

Опубликована в печати:

1 авг. 2001 г.

Идентификаторы БД:

Web of science:	WOS:000170690001796
Chemical Abstracts:	2001:638245

Цитирование в БД: Пока нет цитирований