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Three-way catalyst and preparation method thereof

A technology of three-way catalyst and cross-linking agent, which is applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of increasing the manufacturing and use costs of three-way catalysts, difficult to recover precious metals, and expensive precious metals, etc. Achieve the effect of delaying carbon deposition, improving thermal stability and delaying the loss of active components

Inactive Publication Date: 2017-02-22
SHANDONG POLYTECHNIC COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, most commonly used three-way catalysts use noble metal ions as active components. Heavy metals are easily lost from the catalyst carrier, causing environmental pollution. The lost precious metals are extremely difficult to recover, and precious metals are expensive, which increases the cost of manufacturing and using three-way catalysts.

Method used

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  • Three-way catalyst and preparation method thereof
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Examples

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Embodiment 1

[0020] A three-way catalyst comprising the following raw materials: 2 parts lanthanum chloride, 2 parts scandium chloride, 5 parts polyvinylpyrrolidone, 21 parts titanium dioxide, 16 parts ceramics, 16 parts silica gel, 2 parts sodium sulfate, sulfuric acid 5 parts of palladium, 6 parts of cerium chloride, 17 parts of zirconium dioxide, γ-Al 2 O 3 17 parts, 2 parts crosslinking agent, the preparation method of the three-way catalyst is: dissolve lanthanum chloride, scandium chloride and polyvinylpyrrolidone in water, then add titanium dioxide, ceramics and silica gel, and immerse for 1.1h at room temperature. Add a cross-linking agent for cross-linking for 0.6 hours. The cross-linked material is prepared into microspheres that can pass through a 60-mesh sieve with a high-pressure forming apparatus. The microspheres are denoted as A, and A is placed in a 0.1 mol / L sodium hydroxide solution Soak in medium for 12 minutes to obtain porous microspheres as B. Use deionized water to cl...

Embodiment 2

[0022] A three-way catalyst comprising the following raw materials: 9 parts of lanthanum chloride, 9 parts of scandium chloride, 7 parts of polyvinylpyrrolidone, 28 parts of titanium dioxide, 18 parts of ceramics, 18 parts of silica gel, 4 parts of sodium sulfate, and sulfuric acid 7 parts of palladium, 6 parts of cerium chloride, 24 parts of zirconium dioxide, γ-Al 2 O 3 18 parts, 4 parts crosslinking agent, the preparation method of the three-way catalyst is: dissolve lanthanum chloride, scandium chloride and polyvinylpyrrolidone in water, then add titanium dioxide, ceramics and silica gel, and immerse for 1.8h at room temperature. Add a cross-linking agent to cross-link for 0.9h. The cross-linked material is prepared into microspheres that can pass through a 60-mesh sieve with a high-pressure molding machine. The microspheres are denoted as A, and A is placed in a 0.1 mol / L sodium hydroxide solution Soak the microspheres in medium for 28 minutes to obtain the porous microsphe...

Embodiment 3

[0024] A three-way catalyst comprising the following raw materials: 5 parts of lanthanum chloride, 5 parts of scandium chloride, 6 parts of polyvinylpyrrolidone, 25 parts of titanium dioxide, 20 parts of ceramics, 20 parts of silica gel, 3 parts of sodium sulfate, and sulfuric acid 6 parts of palladium, 7 parts of cerium chloride, 20 parts of zirconium dioxide, γ-Al 2 O 3 18 parts, 3 parts crosslinking agent, the preparation method of the three-way catalyst is: dissolve lanthanum chloride, scandium chloride and polyvinylpyrrolidone in water, then add titanium dioxide, ceramics and silica gel, and immerse for 1.5h at room temperature. Add a cross-linking agent for cross-linking for 0.8 hours. The cross-linked material is prepared into microspheres that can pass through a 60-mesh sieve with a high-pressure molding machine. The microspheres are denoted as A, and A is placed in a 0.1 mol / L sodium hydroxide solution Soak in medium for 20 minutes to obtain porous microspheres as B. Us...

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Abstract

The invention relates to the field of catalysts, in particular to a three-way catalyst and a preparation method thereof. The three-way catalyst comprises the following raw materials in parts by weight: 1-10 parts of lanthanum chloride, 1-10 parts of scandium chloride, 5-8 parts of polyvinylpyrrolidone, 20-30 parts of titanium dioxide, 15-25 parts of ceramics, 15-25 parts of silica gel, 1-5 parts of sodium sulfate, 4-8 parts of palladium sulfate, 5-7 parts of cerium chloride, 15-25 parts of zirconium dioxide, 15-20 parts of gamma-Al2O3 and 1-5 parts of a cross-linking agent. The three-way catalyst and the preparation method thereof provided by the invention have the benefits that through adding rare earth elements: lanthanum, scandium and cerium, the heat stability of B acid in the catalyst can be improved, so that the active tetragonal zirconium dioxide and titanium dioxide are more stable; the center strength and the density of surface acid are adjusted, the anti-toxic ability is increased, the mechanical strength is improved, and the carbon deposition phenomenon of the surface of the catalyst and the loss of heavy metals are delayed.

Description

Technical field [0001] The invention design catalyst field, especially relates to a three-way catalyst and a preparation method thereof. Background technique [0002] With the development of science and technology and the continuous improvement of people’s living standards, automobiles have become the mainstream means of transportation and are widely used. However, with the growth of automobile ownership, automobile exhaust [0003] Air pollution is becoming more and more serious. In very large and medium-sized cities, automobile exhaust has gradually become the main factor of air pollution. Therefore, the treatment of automobile exhaust pollution has become a problem that governments all over the world attach great importance to. [0004] The treatment of automobile exhaust pollution mainly adopts two methods: internal purification and external purification. External purification is the most effective means to control automobile exhaust pollution. External purification refers to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38B01D53/94B01D53/62B01D53/56B01D53/72
CPCB01D53/945B01J31/38B01D2258/01B01J35/51Y02T10/12
Inventor 周晶高琰孙广军司崇殿
Owner SHANDONG POLYTECHNIC COLLEGE
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