Hydride complexes of titanium and zirconium attached to SiO2 as hydrogenation catalysts |
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| Affiliation: | 1. A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119334, Moscow, Russian Federation;2. Peoples Friendship University of Russia (RUDN University), 117198, Moscow, Russian Federation;1. Institute of Chemical Research of Catalonia, Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain;2. Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, c/Marcel·lí Domingo, 1, 43007 Tarragona, Spain;3. Institució Catalana de Recerca i Estudis Avançats, Passeig Lluís Companys, 23, 08010 Barcelona, Spain |
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| Abstract: | Catalysts obtained by interacting Ti(CH2C6H5)4 or Zr(π-C3H5)4 with the surface of SiO2 and treated with hydrogen possess a very high activity with respect to hydrogenation of benzene and cyclohexene. This activity is commensurable with that of supported Group VIII metals. The catalysts were studied by chemisorption, thermodesorption and EXAFS methods, and were shown to contain anchored hydride complexes of Ti and Zr, whose content can be controlled by varying the temperature of their treatment with hydrogen. A quantitative correlation exists between the specific activity of the catalysts under consideration in hydrogenation reactions and the content of hydride complexes in these catalysts. |
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