Patent ID: 9186657
Filing Date: 2015-11-17
Classification: B01D,B01J

Abstract:
1. A method for purifying an exhaust gas, comprising: contacting the exhaust gas with an exhaust gas purification catalyst; wherein the exhaust gas purification catalyst comprises titanium oxide as a main component and an oxide of one element or two or more elements selected from the group consisting of tungsten (W), molybdenum (Mo), and vanadium (V) as an active component; wherein the active component is reacted with a phosphoric acid or a water soluble phosphoric acid compound to form a complex thereof 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); wherein the exhaust gas contains nitrogen oxide and elemental mercury; and wherein the nitrogen oxide is reduced by ammonia.