我想問chem (for HKCEE)~有咩REACTION係需要用catalyst??

contact process(V2O5/Pt)
cracking(pumice stone/Al2O3/ungalzed porcelain/porous pot)
esterification(conc. H2SO4)
preparation of urea-methanal(conc. H2SO4)
preparation of polystrene(kerosene)
hydrogenation of unsaturated hydrocarbon(nickel)
steam reforming of nephtha(nickel)
catalytic converter(Pt)
acid hydrolysis of ester(dilute acid)
alkaline hydrolysis of ester(alkali)

係咁多啦，括號入面係需要的catalyst

cracking
saponification
esterification
contact process
polymerization
making alcohol and alcohol acid