The price of an ammonia catalyst is primarily driven by its chemical composition (iron-based vs. ruthenium-based) and its physical structure. For standard Haber-Bosch processes, look for magnetite-based (Fe3O4) catalysts with promoters like Al2O3, K2O, and CaO. Key performance indicators include high catalytic activity at lower temperatures, mechanical crushing strength (typically >400N/particle), and a large specific surface area (10-20 m²/g). Higher concentrations of rare earth promoters or specialized pre-reduced versions will command a premium price but offer faster plant start-up times.