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# Give four examples of heterogeneous catalysis.

5.19    Give four examples of heterogeneous catalysis.

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Four examples of heterogeneous catalysis-

1. oxidation of sulphur dioxide into sulphur trioxide in the presence of Pt.

$2SO_{2}(g)\overset{Pt(s)}{\rightarrow}2SO_{3}(g)$

2. the combination between dinitrogen and dihydrogen to form ammonia

$N_{2}(g)+3H_{2}(g)\overset{Fe(s)}{\rightarrow}2NH_{3}(g)$

3. Hydrogenation of vegetable oils in the presence of Ni  as a catalyst

$Veg. Oil(l)+H_{2}(g)\overset{Ni(s)}{\rightarrow}veg Ghee(s)$

4. Ostwald Process - oxidation of ammonia into nitric acid in the presence of Pt

$4NH_{3}(g)+5O_{2}(g)\overset{Pt(s)}{\rightarrow}4NO_{2}(g)+6H_{2}O$

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