Abstract. Ru + Ag/US-Y and Ru + Co/US-Y based catalysts have been studied for their catalytic activity towards N2O decomposition, a reaction of current environmental importance. Ruthenium-cobalt based catalyst shows higher catalytic activity than the ruthenium-silver-based catalyst. Almost 90% conversion ofN2O is achieved over Ru + Co/US-Y at 583 Kwith amaximumof 0.134 mmol of N2O decompose…