EXHAUST EMISSION CONTROL DEVICE

• Main Authors: NISHIOKA HIROMASA, MIYOSHI NAOTO, NOMURA YASUTAKA, ORI HIROTAKA, SUGIURA KOJI, SATO AKEMI, IKEBE MASATOSHI, NAKAJIMA RYOTA
• Format: Patent
• Language: English; Japanese
• Published: 03.12.2020
• Subjects: BLASTING; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; STEAM ENGINES; THEIR RELEVANT APPARATUS; TRANSPORTING; WEAPONS

To provide an exhaust emission control device which can suppress an increase of a pressure loss.SOLUTION: This exhaust emission control device having a honeycomb base material and a flow-in cell side catalyst layer has a porous bulkhead which defines a plurality of cells extending up to a flow-out side end face from a flow-in side end face, the plurality of cells include a flow-in cell and a flow-out cell which adjoin each other with the bulkhead sandwiched therebetween, the flow-in cell is opened at a flow-in side end, and closed at a flow-out side end, the flow-out cell is closed at a flow-in side end, and opened at a flow-out end side, the flow-in cell side catalyst layer is arranged on a surface of a flow-in cell side in a flow-in cell side catalyst region up to a position near a flow-out side end from the flow-in side end of the bulkhead, and the gas permeability of a flow-out side bulkhead part including a flow-out side region up to the flow-out side end from a position apart from the flow-out side end of the bulkhead is higher than that of a catalyst arrangement bulkhead part including the flow-in cell side catalyst region of the bulkhead and the flow-in cell side catalyst layer.SELECTED DRAWING: Figure 2 【課題】圧力損失が大きくなるのを抑制できる排ガス浄化装置を提供することにある。【解決手段】本発明の排ガス浄化装置は、ハニカム基材と流入セル側触媒層とを備える排ガス浄化装置であって、前記ハニカム基材は、流入側端面から流出側端面まで延びる複数のセルを画成する多孔質の隔壁を有し、前記複数のセルは、前記隔壁を挟んで隣接する流入セル及び流出セルを含み、前記流入セルは、流入側端が開口し、流出側端が封止され、前記流出セルは、流入側端が封止され、流出側端が開口し、前記流入セル側触媒層は、前記隔壁の流入側端から流出側端に近い位置までの流入セル側触媒領域における前記流入セル側の表面に設けられ、前記隔壁の前記流出側端に近い位置から前記流出側端までの流出側領域を含む流出側隔壁部のガス透過性が、前記隔壁の前記流入セル側触媒領域及び前記流入セル側触媒層を含む触媒配置隔壁部より高いことを特徴とする。【選択図】図２