Mostly transition metals and their compounds are utilized as catalyst. The catalytic activity of transition metals is due to the reasons explained below:
1) They illustrate a variety of oxidation states and thus can form intermediate products with different reactants.
2) They are also capable of making interstitial compounds that can absorb and activate the reacting species.
Some illustrations of catalyst are:
1) Iron or molybdenum act as catalyst in the production of ammonia by Haber’s procedure.
2) Vanadium pentoxide (V2O5) is utilized for catalytic oxidation of SO2 to SO3
3) TiCl4 is used as a catalyst in the making of polythene.
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