In industrial chemistry, the Haber-Bosch process remains one of the most significant methods for synthesising ammonia from elemental nitrogen and hydrogen. Which of the following solid catalysts is primarily employed in this process?

Observe the following reactions: I. N2(g) + 3 H2(g) X 773 K, 200 atm 2 NH3(g) II. CO(g) + H2O(g) Y 673 K CO2(g) + H2(g) III. CH4(g) + H2O(g) Z 1270 K CO(g) + 3 H2(g) Catalysts X, Y, and Z respectively are:

Which of the following substances is commonly used as a catalyst in industrial Catalytic Cracking processes?