I am performing catalytic metal supported benzyl alcohol reaction kinetics in presence of potassium carbonate base. Every time order change observed at lower catalyst conc. It showing zero order at 50 deg. cent. At 70 and it becomes second . But when I am using higher catalyst conc. It becomes first order at 90 degree cent. . Why is happened?
This is a common case. You have already answered your question "Is it a non elementary reaction?" Yes, your process proceeds through a sequence of elementary or pseudo-elementary reactions. The rate limiting step depends on conditions.
At different temperatures, there are different rate determining steps, so the order can change. Rate of a first order reaction depends upon temperature and concentration of reactant which further depends upon time. Non-elementary reactions have numerous elementary reaction steps; elementary reactions build up to complicated reactions. Temperature usually does not affect the order of an elementary reaction, But non elementary reaction dependency also on temperature. An increase in temperature typically increases the rate of reaction because an increase in temperature will raise the average kinetic energy of the reactant molecules
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