EXHAUST GAS PURIFICATION CATALYST SUPPRESSING INFLUENCE OF IRON COMPOUND

摘要

In one preferred aspect, there is provided an exhaust gas purification catalyst for reducing nitrogen oxides by ammonia while suppressing oxidation of SO2 in an exhaust gas including nitrogen oxide and ashes containing a Fe component, the catalyst containing titanium oxide as a main component and an oxide of one or more elements selected from the group consisting of tungsten (W), molybdenum (Mo), and vanadium (V) as an active component, wherein the catalyst contains phosphoric acid or a water soluble phosphoric acid compound so that the atomic ratio of phosphorus (P) to a catalytically active component represented by the following formula is 0.2 to 1.0; P/catalytically active component (atomic ratio) = number of moles of P/(number of moles of W + number of moles of Mo + number of moles of V).