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Storage-reduction catalyst and preparation method thereof

A catalyst and catalyst quality technology, applied in the storage-reduction field of nitrogen oxides, can solve the problems of low removal rate of nitrogen oxides, weakening catalytic activity of precious metals, etc., and achieve the effect of improving efficiency, improving removal rate, and improving overall efficiency

Active Publication Date: 2015-01-07
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during use, storage components will inevitably weaken the catalytic activity of noble metals, resulting in a low removal rate of nitrogen oxides.

Method used

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  • Storage-reduction catalyst and preparation method thereof
  • Storage-reduction catalyst and preparation method thereof

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preparation example Construction

[0036] The present invention also provides a catalyst preparation method, which can prepare the above-mentioned storage-reduction catalyst. The preparation method includes the following steps: mechanically grinding or mechanically stirring the first catalyst and the second catalyst for 30 minutes to 60 minutes to obtain the storage-reduction catalyst. catalyst.

[0037] It should be noted that the first catalyst is a catalyst supported solely by the above-mentioned noble metal, and the second catalyst is a catalyst jointly supported by the above-mentioned noble metal and storage components; and in the process of mechanical grinding or mechanical stirring, the first catalyst will not be destroyed and the composition of the second catalyst.

[0038] As an implementation manner, the first catalyst and the second catalyst are synthesized by an existing chemical method, such as an impregnation method.

[0039] The storage-reduction catalyst of the invention has a simple structure,...

Embodiment 1

[0042] The magnesium-aluminum composite oxide supported by palladium (the mass fraction of palladium is 1%) and the magnesium-aluminum composite oxide supported by palladium-potassium (the mass fraction of palladium and potassium are respectively 1% and 8%) are in mass ratio 1: 1 was mechanically ground in a mortar for 30 minutes to obtain a storage-reduction catalyst.

[0043] In this embodiment, the first catalyst is a palladium-supported magnesium-aluminum composite oxide, and the second catalyst is a palladium-potassium co-supported magnesium-aluminum composite oxide. Wherein, the first precious metal is palladium, and the first carrier is magnesium-aluminum composite oxide (the specific surface area is 90m 2 / g, and the molar ratio of magnesium to aluminum is 3:1); the second noble metal is palladium, the storage component is potassium, and the second carrier is magnesium-aluminum composite oxide (the specific surface area is 90m 2 / g, and the molar ratio of magnesium to...

Embodiment 2

[0046] Platinum-supported alumina (the mass fraction of platinum is 2%) and platinum-barium co-supported alumina (the mass fractions of platinum and barium are 2% and 20%, respectively) were mechanically mixed in a mortar at a mass ratio of 0.5:1. After stirring for 40 minutes, a storage-reduction catalyst was obtained.

[0047] In this embodiment, the first catalyst is platinum-supported alumina, and the second catalyst is platinum-barium co-supported alumina. Wherein, the first precious metal is platinum, and the first carrier is alumina (specific surface area is 300m 2 / g); the second noble metal is platinum, the storage component is barium, and the second carrier is alumina (specific surface area is 300m 2 / g).

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Abstract

The invention discloses a storage-reduction catalyst and a preparation method thereof. The storage-reduction catalyst is used for removing nitrogen oxide, and comprises a first catalyst and a second catalyst which are evenly mixed together; the first catalyst comprises a first precious metal and a first carrier, wherein the first precious metal is separately loaded on the first carrier; the second catalyst comprises a second precious metal, a storage component and a second carrier; the second precious metal and the storage component are loaded on the second carrier together. The storage-reduction catalyst can make up the weakening of the storage component in the traditional catalyst for the activity of precious metals, and is capable of fully exerting the catalytic activity of the first precious metal while fully utilizing the storage capacity of the storage component, so that the removal rate of the nitrogen oxide can be remarkably improved.

Description

technical field [0001] The invention relates to storage-reduction of nitrogen oxides, in particular to a storage-reduction catalyst for removing nitrogen oxides and a preparation method thereof. Background technique [0002] NOx storage-reduction technology is a catalytic technology for the removal of nitrogen oxides from lean-burn engines. This technology uses the alternating lean / rich atmosphere formed by engine exhaust to control the emission of nitrogen oxides. In the lean atmosphere, the nitrogen oxides are stored in the catalyst, and in the rich atmosphere, the nitrogen oxides stored in the catalyst are oxidized The substances are reduced by hydrogen, carbon monoxide and hydrocarbons. [0003] Catalysts used in NOx storage-reduction technologies generally consist of three components: (1) noble metals, for the oxidation and reduction of NOx; (2) NOx storage components, typically alkali metals and / or Compounds of alkaline earth metals; (3) Carriers, high specific surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/58B01J23/66B01J29/068B01D53/94B01D53/56
Inventor 张业新张昭良张建陈慧
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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