Investigation of phase formation temperature of nano-sized solid solution of copper/cobalt molybdate and chromium–phosphate (M1xCr1−xMoxP1−xO4) [M1 = Co, Cu]

A series of nano-sized metal–chromium–molybdenum–phosphorous (M1xCr1−xMoxP1−xO4) [M1 = Co, Cu] oxides solid solutions have been prepared having different percentage of the constituting transition metals from their precursors metal molybdates and chromium phosphate using organic complexing agent TEA (triethanolamine). The variations of phase separation temperature with respect to the amount of different constituents have been studied. The materials are efficient catalyst for reduction of p-nitrophenol to p-aminophenol by sodium borohydride.