Abstract: A catalyst for selective catalytic reduction is described. Cerium (III) sulfate (cerous sulfate) is bound to a support. The catalyst also includes vanadium oxide and cerium oxide.

Abstract: A reducing agent pyrolysis system for a selective catalytic reduction apparatus includes an elbow duct that is installed on an exhaust duct at a front end of a reactor, allows exhaust gas to flow into the elbow duct, and allows the inflow exhaust gas to be discharged toward the reactor. An inner pipe unit is disposed in the elbow duct, and allows a part of the exhaust gas to flow into and be discharged from the inner pipe unit. A heating device is installed in the inner pipe unit, and heats the exhaust gas flowing into the inner pipe unit. A nozzle is installed in the inner pipe unit, is disposed at a rear end of the heating device based on a flow of the exhaust gas, and injects a reducing agent into the inner pipe unit.

Abstract: A selective catalytic reduction and catalytic regeneration system includes: a main exhaust flow path; a reactor which is installed on the main exhaust flow path; a bypass exhaust flow path which branches off from the main exhaust flow path, and bypasses the reactor; an ammonia injection unit, which injects ammonia to the exhaust gas which is to flow into the reactor; a hydrolysis chamber, which produces ammonia to be supplied to the ammonia injection unit; a branch flow path, which branches off from the main exhaust flow path at a front side of the reactor; a recirculation flow path, which branches off from the main exhaust flow path at a rear side of the reactor, and merges with the branch flow path; and a multifunctional flow path, which connects the hydrolysis chamber with a point where the branch flow path and the recirculation flow path merge together.