| 摘要 |
An exhaust gas purification system for purifying an exhaust gas discharged from an energy conversion part (100), the system comprising a reservoir part (4) which retains a reducing solution that reduces nitrogen oxides contained in the exhaust gas, a catalyst (22) which has been disposed in an exhaust gas passage (11) and accelerates the reduction reactions of the nitrogen oxides, and a supply part (3) which supplies, to the catalyst (22), the reducing solution supplied from the reservoir part (4). The reducing solution comprises urea, which is a reducing agent for reducing nitrogen oxides contained in the exhaust gas, a solute (70) which is not urea, and a solvent in which the reducing agent and the solute are soluble. The solute (70) is constituted of molecules each comprising: a first moiety (71), which, in cases when the temperature of the reducing solution has fallen to or below a predetermined reference temperature, comes selectively close to solid/liquid interfaces (80) within the solvent; and a second moiety (72), which has been connected to the first moiety (71) and has a poor affinity for the solvent. |
