Ammonia → Tricalcium Phosphate

Participants

Reaction Steps

HAP-2 (Ca/P=1.65) catalysts were prepared by the precipitation method. Analytical grade calcium nitrate [Ca(NO3)2] and diammonium hydrogen phosphate [(NH4)2HPO4] was used for preparation of catalyst. Calcium nitrate solution (40.12 g in 125 ml water) and diammonium hydrogen phosphate solutions (13.60 g in 125 ml water) were prepared in deionised water. Ammonia gas was passed in both the solutions till pH 10. The calcium nitrate solution was added drop wise with constant stirring to the solution of diammonium hydrogen phosphate. A thick white precipitate of calcium phosphate was formed which was filtered, washed and dried in an oven at 150° C. for 8 hr. The dried calcium phosphate was calcined at 600° C. for four hours to yield 9.7 g catalyst.

Provenance & Evidence