Abstract: Various physical properties, such as total surface area, iron surface area, alkali surface area, density, pore size distribution etc. of A_110-5Q spherical catalyst for ammonia synthesis have been studied using electron-microscope, thermogravimeter and Mösbauer spectroscopy. Porosity, void fraction and specific pore volume of the catalyst were calculated. The catalyst is characterized by its high activity at low temperature, fine grained crystal and easier reducibility.