APPARATUS FOR CLEANING EXHAUST GAS

摘要

PROBLEM TO BE SOLVED: To provide an apparatus for cleaning exhaust gas exhibiting excellent activity at a low temperature and capable of suppressing the by-production of N2O.

SOLUTION: A diesel engine 1 includes an exhaust pipe 2 for the exhaust gas generated thereby to flow therethrough. The exhaust pipe 2 includes a catalyst 3 active at a high temperature disposed therein and a catalyst 4 active at a low temperature disposed downstream of the catalyst 3. The catalyst 3 active at a high temperature is constituted of Ag supported by a support comprised of Al2O3. The catalyst 4 active at a low temperature is constituted of Pt supported by a support comprised of a mixture of Al2O3and TiO2. In addition to Al2O3and TiO2, only unavoidable impurities are contained in the support of the catalyst 4 active at a low temperature.

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