CATALYST FOR PURIFICATION OF EXHAUST GAS

摘要

A catalyst (1) for purification of exhaust gas comprising a honeycomb base material (2) with an internal wall (21) for partitioning into multiple cell channels (4) extending along the direction of exhaust gas flow and a catalyst layer (3) applied onto the internal wall (21). The proportion (f2) of the macrovoid ratio of the catalyst layer to the thickness of the catalyst layer at a radial cross section of downstream part (12) lying on the downstream side of the exhaust gas purification catalyst unit (1) in the direction of exhaust gas flow (G) is greater than the proportion (f1) of the macrovoid ratio of the catalyst layer to the thickness of the catalyst layer at a radial cross section of upstream part (11) lying on the side upstream of the downstream part (12). Accordingly, the efficiency of exhaust gas purification can be enhanced by effective utilization of the catalyst layer.