CATALYST FOR EXHAUST GAS PURIFICATION

• Main Authors: HORAGUCH KEIJI, SASAKI KOKICHI, NOBUKAWA KEN, IMAI HIROTO
• Format: Patent
• Language: English; Japanese
• Published: 06.10.2016
• 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

PROBLEM TO BE SOLVED: To provide a catalyst for exhaust gas purification capable of suppressing deterioration of the catalyst during high load operation, maintaining a NOx purification rate of the catalyst during low-speed traveling, and improving the NOx purification rate of the catalyst during high-speed traveling.SOLUTION: A catalyst for exhaust gas purification includes a cylindrical substrate to be passed by exhaust gas, having a circular cross section which is vertical to a flow direction of exhaust gas, and a catalyst coat layer formed on the surface of the substrate. In the catalyst for exhaust gas, potassium in the catalyst coat has two different concentration regions.SELECTED DRAWING: Figure 1 【課題】高負荷運転時における触媒の劣化を抑制し、低速走行時における触媒のＮＯｘ浄化率を維持し、高速走行時における触媒のＮＯｘ浄化率を向上させた、排ガス浄化用触媒を提供する。【解決手段】本発明は、排ガスの流れ方向に対して垂直な断面が円である前記排ガスが通過する円柱型の基材と、前記基材の表面に形成される触媒コート層とを備えた排ガス浄化用触媒であって、触媒コート中のカリウムが２つの異なる濃度領域を有することを特徴とする、排ガス浄化用触媒に関する。【選択図】図１