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Cr and Cr,Ti supported catalysts, with different support composition were investigated by Diffuse Reflectance Spectroscopy (DRS) and Electron Spin Resonance (ESR). The interaction between a series of molecules (HC1, CH2C12, CH3CH2CH2OH, CH3CH2OH, H20, CO, H 2, CH2CH2 and NH3) and supported Cr was evaluated. Interaction with acids results in hydrolysis and reduction, while bases give only reduction of the supported Cr. With ethylene, CO and H2, Cr 2§ is the dominant species on silica, while on alumina C r 3§ is preferentially formed. The redox behavior of Cr is also dependent on the sequence of impregnation. Impregnation of Cr followed by impregnation with Ti retards the reduction of Cr, while the reverse order facilitates reduction. These results supports the idea of a support controlled redox behavior.

Scientific Bases for the Preparation of Heterogeneous Catalysts