Give four examples of heterogeneous catalysis?

In chemistry, heterogeneous catalysis refers to the form of catalysis where the phase of the catalyst differs from that of the reactants.
example
(1)Ammonia synthesis from N2 + H2 over iron catalysts
(2)hydrogenation of fatty acids with nickel
(3)hydroformylation of propene-catalyst in aqueous phase, reactants and products mainly in nonaqueous phas
(4)Sulfuric acid synthesis (Contact process) SO2 + O2, SO3 vanadium oxides (catalyst)hydration of SO3 gives H2SO4