Ammonia oxidation catalyst for coal-powered devices

A method of removing ammonia in flue gases where ammonia is used as a selective catalytic reduction agent with a primary catalyst for reducing nitrogen oxides, comprising the steps of: a. add ammonia to flue gases and reducing the nitrogen oxides in the presence of said primary catalyst to produce an effluent treated gas having a lower content of said effluent gases containing NOX and unreacted ammonia; b. contacting said effluent with a catalyst treated gas oxidation of secondary ammonia to reduce the amount of ammonia, said secondary catalyst comprising a precious metal and vanadium supported on a metal oxide support; wherein said effluent gases are obtained from the combustion of coal.