Three-way catalyst used for automobile emission purification and preparation method thereof

A three-way catalyst, automobile exhaust technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. Market application limitations, high light-off temperature problems, to achieve the effect of promoting three-effect performance, active redox performance, and purifying automobile exhaust

Active Publication Date: 2013-12-11
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commercial catalysts used in the domestic and foreign markets for the purification of automobile exhaust are all precious metal types (such as US5157007, UK1499051, etc.), which are relatively expensive. Exhaust gas purification catalysts, and in the world, the reserves of precious metals such as Pt, Pd, Rh are very small and

Method used

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  • Three-way catalyst used for automobile emission purification and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Based on the mass of the cordierite carrier, the mass percentage of the co-catalyst coating is 12%, and the mass percentage of the catalytically active component is 3.3%. The mass ratio of noble metal to transition metal in the catalytic active component is 1:10, the molar ratio of noble metal Rh / Pd is 1:10, and the molar ratio of transition metal Co / Ni is 1:2; the γ-Al in the cocatalyst coating 2 o 3 With rare earth composite oxide (Ce-Zr-M-O x ) with a mass ratio of 1:0.75, wherein the metal M in the rare earth composite oxide is Pr, and the element molar ratio of Ce / Zr / M is 1:0.33:0.01.

[0025] (1) Pretreatment of the carrier

[0026] Put the cordierite honeycomb ceramic carrier into HNO with a mass percentage of 8% 3 Perform surface modification treatment in the solution, place it on a resistance furnace and heat it to boiling, wash the surface layer and residual acid solution in the holes with water after cooling, and put it in an oven to dry for later use;

...

Embodiment 2

[0036] Based on the mass of the cordierite carrier, the mass percentage of the co-catalyst coating is 8%, and the mass percentage of the catalytically active component is 4.4%. The mass ratio of noble metal to transition metal in the catalytic active component is 1:10, the molar ratio of noble metal Rh / Pd is 1:11, and the molar ratio of transition metal Co / Ni is 1:2; the γ-Al in the cocatalyst coating 2 o 3 With rare earth composite oxide (Ce-Zr-M-O x ) with a mass ratio of 1:0.5, wherein the metal M in the rare earth composite oxide is Pr, and the element molar ratio of Ce / Zr / M is 1:3:0.2.

[0037] (1) Pretreatment of the carrier

[0038] Put the cordierite honeycomb ceramic carrier into the HCl solution with a mass percentage of 10% for surface modification treatment, place it on a resistance furnace and heat it to boiling, wash the surface layer and the residual acid in the holes with water after cooling, put Dry in the oven for later use.

[0039] (2) Preparation of co...

Embodiment 3

[0048] Based on the mass of the cordierite carrier, the mass percentage of the co-catalyst coating is 14%, and the mass percentage of the catalytically active component is 2.1%. The mass ratio of noble metal to transition metal in the catalytic active component is 1:20, the molar ratio of noble metal Rh / Pd is 1:4.5, and the molar ratio of transition metal Co / Ni is 1:1; the γ-Al in the cocatalyst coating 2 o 3 With rare earth composite oxide (Ce-Zr-M-O x ) with a mass ratio of 1:1.38, wherein the metal M in the rare earth composite oxide is Nd, and the element molar ratio of Ce / Zr / M is 1:0.66:0.05.

[0049] (1) Pretreatment of the carrier

[0050] Put the cordierite honeycomb ceramic carrier into 5% H 2 SO 4 Surface modification treatment in the solution, placed on a resistance furnace and heated to boiling, after cooling, wash the surface layer and residual acid in the pores with water, and put it in an oven to dry for later use;

[0051] (2) Preparation of co-catalyst co...

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Abstract

The invention relates to a three-way catalyst used for automobile emission purification and a preparation method thereof, and belongs to the field of atmospheric pollution regulation and environment-friendly catalytic materials. The catalyst uses a cordierite honeycomb ceramic as a carrier, a mixture coating of Gamma-Al2O3 and rare earth complex oxide (Ce-Zr-M-Ox) as a promoter, and transition metals of Co and Ni, and precious metals of Pd and Rh as catalytic activity components. According to the invention, through the adoption of a sol method, the pre-treated carrier is coated with the promoter coating, the carrier coated with the promoter coating is dipped into a precursor complex solution of catalytic activity components by using an equal-volume dipping method, and the catalyst is obtained through drying and roasting. The three-way catalyst has low precious metal content; the transition metals of Co and Ni have well concerted catalysis with the precious metals; higher three-way catalytic activities and excellent low temperature ignition performances are shown; carbon monoxide, nitrogen oxide, and hydrocarbon in automobile exhaust can be effectively removed; the preparation process of the catalyst is simple.

Description

technical field [0001] The invention relates to a three-way catalyst for purifying automobile tail gas and a preparation method thereof, belonging to the fields of air pollution control and environmental protection catalytic materials. Background technique [0002] After the car is started, due to incomplete combustion of fuel or high temperature, the exhaust gas contains a large amount of CO, HC, NO x And other substances that are very harmful to the human body, especially in large and medium-sized cities, these harmful substances are dispersed in the urban surface atmosphere, and it is difficult to effectively disperse, which makes the quality of the atmospheric environment worse and seriously endangers human health. Reduce carbon monoxide (CO) and nitrogen oxides (NO) in automobile exhaust x ) and hydrocarbons (HC) and other pollutants is the installation of off-board automotive exhaust catalytic converter, the most critical technology is the preparation of three-way cat...

Claims

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Application Information

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IPC IPC(8): B01J23/89
Inventor 祝社民王玉云沈岳松沈树宝
Owner NANJING UNIV OF TECH
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