EXHAUST EMISSION CONTROL DEVICE

• Main Authors: NISHIOKA HIROMASA, MIYOSHI NAOTO, ORI HIROTAKA, SUGIURA KOJI, SATO AKEMI, MURAWAKI KEISUKE, IKEBE MASATOSHI, NAKAJIMA RYOTA
• Format: Patent
• Language: English; Japanese
• Published: 24.09.2021
• 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 improving the emission control performance and of suppressing the pressure loss.SOLUTION: The exhaust emission control device includes a honeycomb base material, and an inflow cell side catalyst layer, the honeycomb base material having a porous partition wall defining a plurality of cells extending from the inflow side end face to the outflow side end face, the plurality of cells including inflow cells and outflow cells neighboring each other across the partition wall, the inflow side catalyst layer being provided on the surface on the inflow cell side in an inflow side region from the inflow side end of the partition wall to a predetermined position on the outflow side. The ratio Ka/Kb of a gas permeation factor is within 0.4-0.8, where Ka is the gas permeation factor of the inflow side partition wall part including the inflow side region of the partition wall and an inflow cell side catalyst layer and Kb is the gas permeation factor of the outflow side partition wall part including an outflow side region at least from a predetermined position of the partition wall to the outflow side end.SELECTED DRAWING: Figure 2 【課題】浄化性能を向上することができ、かつ圧力損失を抑制することが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、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、複数のセルは、隔壁を挟んで隣接する流入セル及び流出セルを含み、流入セル側触媒層は、隔壁の流入側端から流出側の所定位置までの流入側領域における流入セル側の表面上に設けられ、隔壁の流入側領域及び流入セル側触媒層を含む流入側隔壁部のガス透過係数をＫａとし、少なくとも隔壁の所定位置から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係数をＫｂとした場合に、ガス透過係数の比率Ｋａ／Ｋｂは０．４以上０．８以下の範囲内であることを特徴とする。【選択図】図２