Aluminovanadate oxynitride catalyst: proposition for the basic site

Article Abstract:

Issues concerning the basic sites of an aluminovanadate oxynitride catalyst which is active in the Knoevenagel condensation reaction between benzaldehyde and malononitrile are presented.

Surface chemistry

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Influence of the impregnation pH on the surface characteristics and the catalytic activity of the Mo/lambda-Al2O3 and CoMo/gama-Al2O3 hydrodesulfurization catalysts prepared by equilibrium deposition filtration (EDF)

Article Abstract:

Two unprompted Mo/lambda-Al2O3 catalysts containing almost the same amount of Mo were prepared using equilibrium deposition filtration, EDF, for depositing Mo-oxo species on the alumina surface at two different pH values (3.9 and 6.3). The characterization of specimens showed that the Mo deposition at pH = 3.9 favors the deposition of polymeric Mo-oxo species, in agreement with predictions drawn on the basis of two models related with the acid-base behavior of the gama-Al2O3 surface.

Science & research, All Other Basic Inorganic Chemical Manufacturing, All Other Miscellaneous Chemical Product and Preparation Manufacturing, Catalysts, Chemical preparations, not elsewhere classified, Industrial inorganic chemicals, not elsewhere classified, Molybdenum Compounds, Aluminum Compounds, Chemical properties

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DRIFTS study of the surface structure and nitridation process of mixed galloaluminophosphate oxynitride (AlGaPON) catalysts

Article Abstract:

High surface amorphous oxynitrides AlPON and AlGaPON with similar O/N ration were compared with the spectra of high surface area amorphous oxide AlPO, AlGaPO and GaPO and with that of the nitride GaN. This enable a correct assignation of the bands in their IR vibrational spectra, especially solids named galloaluminophosphate oxynitride, AlGaPON. A shift of the framework band vibrations due to a second-neighbor effect was induced by the substitution of aluminum atoms by gallium.

Spectra, Gallium, Nitrides

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