7)
Zero order reactions are relatively uncommon but
they occur under special conditions Some enzyme
catalysed reactions and reactions which occur on
metal surfaces are a few examples of zero order
reactions The decomposition of gaseous ammonia
on a hot platinum surface is a zero order reaction at
high pressure ( )
( )
( )
1130K
3
2
2
Pt catalyst
2NH
g
N
g +3H
g
→
Rate = k [NH3]0 = k
In this reaction, platinum metal acts as a catalyst