Patent ID: 8394347

Claim:
An exhaust gas conversion system comprising: an oxide catalyst; a filter having a honeycomb structural body including a honeycomb unit having a plurality of through holes divided by partition walls and arranged in a longitudinal direction of the honeycomb unit, the plurality of through holes being sealed on one end of the honeycomb unit in the longitudinal direction, a selective catalytic reduction catalyst having a honeycomb structural body including a honeycomb unit having a plurality of through holes divided by partition walls and arranged in a longitudinal direction of the honeycomb unit, the oxide catalyst, the filter and the selective catalytic reduction catalyst being sequentially arranged in a direction in which an exhaust gas flows in an exhuast path of a diesel engine; and an ammonia supplying device positioned between the filter and the selective catalytic reduction catalyst and configured to supply ammonia, wherein a ratio of an area of a cross section of the selective catalytic reduction catalyst perpendicular to a longitudinal direction of the selective catalytic reduction catalyst with respect to an area of a cross section of the filter perpendicular to a longitudinal direction of the filter is approximately 0.55 or more and approximately 0.90 or less, and wherein the area of the cross section of the filter perpendicular to the longitudinal direction of the filter is approximately 300 cm 2 or more and approximately 1000 cm 2 or less.