Abstract
Aluminum orthophosphate was prepared from aluminum nitrate solution and phosphoric acid solution in the molar ratio of Al/P=1/1. Urea and hexamethylenetetramine were added in this preparation process. The thermal behavior of the obtained phosphates was analyzed by differential thermal analyses, X-ray diffraction, and Fourier transform infrared spectroscopy. Furthermore, these materials and their thermal products were estimated by scanning electron micrograph and particle size distribution. Specific surface areas and pore size distribution of phosphates were calculated from the amount of nitrogen gas adsorbed at the temperature of liquid nitrogen by BET and DH methods. The acidic property was estimated from the adsorption of trimethylamine gas.
