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Q.
In which of these process platinum is used as a catalyst?
Haryana PMTHaryana PMT 2006
Solution:
Platinum acts as catalysts in the oxidation of ammonia to form nitric oxide. This reaction is used in the Ostwalds method of nitric acid preparation.
$4 NH _{3}+5 O _{2} \xrightarrow [750^{\circ} C ] { Pt } 4 NO +6 H _{2} O 4 NO + O _{2} \rightarrow 2 NO _{2} 4 NO _{2}+ O _{2}+2 H _{2} O \rightarrow 4 HNO _{3}$