Abstract

Two isomorphous VOPO 4 catalysts were prepared and used as support materials for the in situ synthesis of ammonium salt of 12-molybdophosphoric acid (AMPA) from their solid phase phosphate component. Formation of AMPA was confirmed by the XRD and FTIR analyses. The activity of the catalysts in the ammoxidation reaction revealed that the in situ synthesized AMPA catalysts are more active than the parent VOPO 4 catalysts in the conversion of 2-methylpyrazine to 2-cyanopyrazine.

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