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Novel catalyst capable of efficiently removing nitrogen-carbon oxide in automobile tail gas

A technology for automobile exhaust and oxides, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as large dispersion gradients of noble metal components, and achieve excellent Exhaust gas purification effect, good thermal stability, good catalytic stability effect

Inactive Publication Date: 2019-05-21
朱国宏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a novel catalyst capable of efficiently removing nitrogen and carbon oxides from automobile exhaust, adopts a gradient temperature treatment method, and solves the problems of relatively large dispersion gradients of precious metal components in the preparation of three-way catalysts at present, and the three-way catalyst prepared at the same time has excellent exhaust gas purification effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 automobile tail gas purification technology

[0023] Automobile exhaust purification technology, the specific steps are as follows:

[0024] 1) Honeycomb carrier is adopted, palladium nitrate and rhodium nitrate are used as precious metal materials, alumina, cerium-zirconium powder and pseudo-boehmite are used as promoter materials;

[0025] 2) The cocatalyst material is prepared into a slurry, after mixing alumina, cerium-zirconium powder, and pseudo-boehmite, stirring and mixing after entering water;

[0026] 3) coating the emulsified slurry on the carrier, drying and drying;

[0027] 4) Heat-treat the dried product. The heat-treatment parameters are as follows: Gradient drying temperature rises from 70°C to 150°C for 60 minutes, and rises from 150°C to 350°C in 30 minutes; when decomposing, keep the temperature at 350°C for 60 minutes;

[0028] When coating palladium nitrate and rhodium nitrate, soak the carrier in the nitric acid solution of palladium...

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Abstract

The invention discloses a novel catalyst capable of efficiently removing nitrogen-carbon oxide in automobile tail gas. The novel catalyst is prepared by the following steps: 1) providing a carrier, aprecious metal material and a cocatalyst material; 2) emulsifying slurry of the cocatalyst material; 3) applying the emulsified slurry to the carrier, airing and drying; 4) performing thermal treatment on a dried product; 5) obtaining a ternary catalyst product after thermal treatment. A preparation method of the novel catalyst disclosed by the invention is simple, the precious metal and the cocatalyst have a good dispersion effect, and the prepared catalyst has better thermal stability and has better catalytic stability when being applied to tail gas treatment.

Description

technical field [0001] The invention belongs to the field of automobile tail gas treatment, in particular to a novel catalyst capable of efficiently removing nitrogen and carbon oxides from automobile tail gas. Background technique [0002] The main pollutants of automobile exhaust are carbon monoxide (CO), hydrocarbons (HC) and nitrogen and carbon oxides. The catalyst installed in the exhaust system can oxidize carbon monoxide and hydrocarbons into carbon dioxide and water, and simultaneously oxidize nitrogen and carbon The waste gas can be reduced to non-toxic nitrogen to realize the purification of exhaust gas. At present, this catalyst is usually a three-way catalyst. The three-way catalyst consists of two parts: a carrier and an active catalytic substance covered on the carrier; the active catalytic substance is usually selected from noble metals, such as one or more of platinum, palladium and rhodium, and additional oxidizing materials are added. [0003] In the curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/94B01D53/56
Inventor 朱国宏
Owner 朱国宏