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Device and method for regenerating exhaust purification catalyst

An exhaust purification and regeneration device technology, applied in catalyst regeneration/reactivation, exhaust devices, physical/chemical process catalysts, etc. The effect of good regeneration efficiency and cost reduction

Inactive Publication Date: 2010-03-24
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the former is the use of partial oxidation of hydrocarbons to reduce NO x The method of regenerating the catalyst by occluding and reducing it is not a method of regenerating the purification activity of precious metals
In addition, the latter is a method of regenerating the diesel particulate filter, which is a method of regenerating the filter by removing diesel particulates, and is not a method of regenerating the purification activity of precious metals.

Method used

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  • Device and method for regenerating exhaust purification catalyst
  • Device and method for regenerating exhaust purification catalyst
  • Device and method for regenerating exhaust purification catalyst

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Experimental program
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Effect test

Embodiment 1

[0052] The above-mentioned granular catalysts were placed in a tubular furnace, and subjected to a nitrogen endurance test in which they were held at 950° C. and 1000° C. for 5 hours in a nitrogen atmosphere. Each catalyst after the nitrogen durability test was subjected to an oxidation step of holding in air at 400° C., 600° C., and 800° C. for 2 hours, and then, each catalyst after the oxidation step was subjected to an oxidation step containing 3% by volume of H 2 The reduction step was carried out at 500° C. for 15 minutes in a nitrogen atmosphere.

Embodiment 2

[0056] Put the above-mentioned granular catalyst into the tubular furnace, and carry out the process in rich gas (CO: 2%, N 2 : remainder) and lean gas (O 2 : 5%, N 2 : Remainder) RL endurance test of holding at 1000° C. for 5 hours in an atmosphere alternately repeated every 120 seconds. The catalyst after the RL endurance test was subjected to an oxidation step of holding in air at 600° C. for 2 hours, and then, the catalyst after the oxidation step was subjected to an oxidation step containing 3% by volume of H 2 The reduction step was carried out at 500° C. for 15 minutes in a nitrogen atmosphere.

Embodiment 3

[0060] The above-mentioned granular catalyst was placed in an electric furnace, and an air durability test was performed in which the catalyst was kept in air at 1000° C. for 5 hours. The catalyst after the air durability test was subjected to an oxidation step of holding in air at 600° C. for 2 hours, and then, the catalyst after the oxidation step was subjected to an oxidation step containing 3% by volume of H 2 The reduction step was carried out at 500° C. for 15 minutes in a nitrogen atmosphere.

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Abstract

A regeneration device has a heater (2) for heating a catalyst (1) with fuel supply to an engine stopped, a pump (4) for supplying oxidizing gas or reducing gas to the heated catalyst (1), and a switching valve (3). In an oxidizing step, a poisoning substance, such as HC, adsorbed to noble metal is removed by oxidation and noble metal particles become substances, such as pure oxide etc., in an oxidized state. In a reducing step after the oxidizing step, the noble metal particles are reduced and at the same time re-dispersed on a carrier to become fine noble metal particles. A deteriorated catalyst can be regenerated without interrupting the use of the catalyst and without sacrificing drivability.

Description

technical field [0001] The present invention relates to a regeneration device and regeneration method of a deteriorated exhaust gas purification catalyst. Background technique [0002] In the exhaust system of automobiles, loading oxidation catalysts, three-way catalysts, NO x Catalysts for exhaust purification such as occlusion reduction catalysts are stored, and harmful components in exhaust gas are purified by the catalysts for exhaust purification. In this exhaust gas purification catalyst, noble metals such as Pt, Rh, and Pd exhibit catalytic activity, and the noble metals are used in a state supported on a carrier including a porous oxide such as alumina. [0003] In order for the noble metal to exhibit its activity to the maximum, it is preferable to hold the noble metal particles in a highly dispersed state as fine as possible. Therefore, a solution of a soluble noble metal compound such as complex salt or nitrate is used to support the noble metal on the support b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01J23/96B01J38/10B01J38/12F01N3/08F01N3/20
CPCB01J23/96B01J23/42B01D2255/1021B01J38/12F01N2240/28Y02T10/22B01D53/9445B01D2255/206B01J23/63F01N3/206F01N2610/04Y02T10/26B01J38/10F01N3/2013F01N2240/16F01N3/22Y02A50/20Y02T10/12B01D53/86
Inventor 大和正宪吉田健高木信之田边稔贵长井康贵堂前和彦高桥直树
Owner TOYOTA JIDOSHA KK
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