AMMONIA DECOMPOSITION CATALYST

摘要

An ammonia decomposition catalyst to be used for an ammonia exhaust gas having a high moisture content; and a method for purifying the ammonia exhaust gas. An ammonia decomposition catalyst for treating an ammonia exhaust gas containing moisture, the catalyst comprising: a lower layer having a noble metal, an inorganic oxide, phosphorus, and a first proton type zeolite or a first ion exchange type zeolite ion-exchanged with Cu, Co or Fe ions; and an upper layer provided on the lower layer and having a second proton type zeolite or a second ion exchange type zeolite ion-exchanged with Cu, Co or Fe ions.