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Sulfur occlusion catalyst

A catalyst and oxide technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve problems such as difficulty in preventing sulfur poisoning

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

AI Technical Summary

Problems solved by technology

In this way, SO 2 will flow into the NO configured on the downstream side x In occlusion-reduction catalysts, it is difficult to prevent sulfur poisoning

Method used

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  • Sulfur occlusion catalyst
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Examples

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Embodiment 1

[0044] figure 1 A sulfur storage catalyst according to an example of the present invention is shown. The sulfur storage catalyst comprises a straight-line honeycomb-shaped support substrate 1 having many unit channels with quadrilateral cross-sections, and a catalyst coating 2 formed on the surface of its cell partition walls 10 . On the exhaust gas upstream side of the catalyst coating layer 2, an upstream side catalyst portion 20 carrying Ba and Pt is formed, and a downstream side catalyst portion 21 carrying Mg, Ba, and Pt is formed on the downstream side thereof. The downstream side catalyst portion 21 is formed within a range of 3 / 10 of the entire length of the carrier substrate 1 from the exhaust side end surface of the carrier substrate 1 .

[0045] Such as figure 2 As shown, the sulfur storage catalyst is configured in the exhaust system of the diesel engine x It is used on the exhaust gas upstream side of the occlusion reduction catalyst.

[0046] Hereinafter, a ...

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PUM

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Abstract

A noble metal was deposited at least on an upstream-side catalyst part (20), and an SOx-occluding material reducing noble-metal activity, such as magnesium or potassium, was deposited on a downstream-side catalyst layer (21). Since the noble metal deposited on the upstream-side catalyst part (20) is inhibited from decreasing in oxidation activity, SO2 is efficiently oxidized to SOx. This SOx is occluded and held by the SOx-occluding material deposited on the downstream-side catalyst layer (21). Consequently, this catalyst has improved SOx-occluding performance and further has excellent durability.

Description

technical field [0001] The present invention relates to a sulfur storage catalyst for storing sulfur components in automobile exhaust so as to prevent them from flowing out to the downstream side. The sulfur storage catalyst of the present invention is configured in NO x Upstream of occlusion reduction catalysts, can be used to prevent NO x Sulfur poisoning of occlusion-reduction catalysts. Background technique [0002] NO x occlusion reduction catalyst. The NO x Occlusion-reduction Catalysts Convert NO x Absorbing material to absorb NO x , during rich spike from NO x NO released from occlusion material x It is reduced and purified by reducing components such as HC present in large quantities in the atmosphere. Release NO x After NO x The occlusion material recovers NO x With the function of occlusion, the NO x occlusion. [0003] NO x The occlusion material contains alkali metal or alkaline earth metal, through and NO x The reaction becomes nitrate or nitrit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/58B01D53/94F01N3/28
CPCB01D2257/404B01D2255/202B01J23/58F01N3/0814B01J35/0006F01N2013/026B01D2253/10B01D2255/204F01N2570/14B01D2258/01F01N3/0807F01N3/085B01D2257/302B01D53/949F01N2570/04B01J37/0242F01N13/0097B01J35/19B01D53/94F01N3/28
Inventor 小仓义次远藤隆行
Owner TOYOTA JIDOSHA KK
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