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Cuprous modified zeolite diesel engine emission pollutant oxidation and purification catalyst

A technology for purifying catalysts and molecular sieves, applied in physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, mechanical equipment, etc., can solve difficult problems such as improving catalytic activity, reducing production costs, Effect of improving sulfur resistance and heat deactivation performance

Active Publication Date: 2017-05-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, although monovalent copper-modified ZSM-5 molecular sieve catalysts have good catalytic performance in low-temperature oxidation reactions, it is still difficult to meet the requirements for running diesel vehicles (mainly buses) in cities and for lower exhaust gas temperatures. Requirements for the catalytic performance of particulate matter oxidation and purification reactions

Method used

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  • Cuprous modified zeolite diesel engine emission pollutant oxidation and purification catalyst
  • Cuprous modified zeolite diesel engine emission pollutant oxidation and purification catalyst
  • Cuprous modified zeolite diesel engine emission pollutant oxidation and purification catalyst

Examples

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preparation example Construction

[0043] (3) Preparation of coating slurry

[0044] The prepared monovalent copper-modified ZSM-5 molecular sieve and La(NO 3 ) 3 ·6H 2 O, Ce(NO 3 ) 3 ·6H 2 O, Zr(NO 3 ) 4 ·5H 2 O, pure γ-Al 2 o 3 Powder, pure TiO 2 The powder, aluminum sol, silica sol, polyethylene glycol, and nitric acid are added to deionized water whose total mass is 10 to 15 times that of the catalytic coating, and fully stirred to form a uniform slurry. The pH value of the homogeneous slurry is adjusted to 3-4 with 1 mol / L sodium hydroxide solution or glacial acetic acid. The uniform slurry is ground on a wet grinder until the D50 particle size is in the range of 1.0-1.2 μm, and then the ground uniform slurry is stirred at 60-80° C. for 16-24 hours to obtain the coating slurry.

[0045] (4) Coating of coating slurry

[0046] Design the mass of the 400-mesh cordierite honeycomb ceramic carrier to be coated with the catalytic coating; weigh the cylindrical 400-mesh cordierite honeycomb ceramic c...

Embodiment 1

[0049] (1) Determination of the amount of preparation and supported catalyst raw materials

[0050] In the main catalyst of the catalyst prepared in Design Example 1, monovalent copper modified ZSM-5 molecular sieve and La 2 o 3 The mass percentage is: 60%:40%; Cu in monovalent copper modified ZSM-5 molecular sieve 2 The mass percent of O and ZSM-5 molecular sieve is: 10%: 90%; CeO in cocatalyst 2 and ZrO 2The mass percentage is: 60% / 40%. The mass percent of main catalyst, co-catalyst and coating base material is: 20%:20%:60%. Among coating base materials, SiO 2 、TiO 2 with γ-Al 2 o 3 The mass percentage is: 20%:20%:60%, of which all γ-Al 2 o 3 Medium pure γ-Al 2 o 3 γ-Al produced by calcination of powder and aluminum sol 2 o 3 The mass percentage is: 75%: 25%. Every 100g of catalytic coating requires 10g of polyethylene glycol with an average molecular weight of 20,000 and 50g of nitric acid; every 100g of monovalent copper-modified ZSM-5 molecular sieve requir...

Embodiment 2

[0059] (1) Determination of the amount of preparation and supported catalyst raw materials

[0060] In the main catalyst of the catalyst prepared in Design Example 2, monovalent copper modified ZSM-5 molecular sieve and La 2 o 3 The mass percentage is: 80%:20%; Cu in monovalent copper modified ZSM-5 molecular sieve 2 The mass percent of O and ZSM-5 molecular sieve is: 13%: 87%; CeO in cocatalyst 2 and ZrO 2 The mass percentage is: 60% / 40%. The mass percent of main catalyst, co-catalyst and coating base material is: 10%:15%:75%. Among coating base materials, SiO 2 、TiO 2 with γ-Al 2 o 3 The mass percentage is: 20%:30%:50%, where γ-Al 2 o 3 Medium pure γ-Al 2 o 3 γ-Al produced by calcining powder and aluminum sol 2 o 3 The mass ratio is: 75%:25%. Every 100g of catalytic coating requires 15g of polyethylene glycol with an average molecular weight of 20,000 and 25g of nitric acid; every 100g of monovalent copper-modified ZSM-5 molecular sieve corresponds to 300ml of...

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Abstract

The invention discloses a cuprous modified zeolite diesel engine emission pollutant oxidation and purification catalyst. According to the catalyst, a cuprous modified ZSM-5 molecular sieve and La2O3 form a main catalyst, a CeO2-ZrO2 solid solution is taken as a cocatalyst, SiO2, TiO2 and gamma-Al2O3 form a coating base material and 400-mesh cordierite honeycomb ceramic is taken as a catalyst carrier. The preparation technology comprises the steps of preparation and determination of the raw material amount of a load catalyst, preparation of the cuprous modified ZSM-5 molecular sieve and preparation and coating of coating slurry. The catalyst is used for purifying HC, CO and PM pollutants in diesel engine exhaust by being packaged in a diesel engine oxidation catalyst. a noble metal main catalyst in a traditional diesel engine oxidation catalyst is replaced with the catalyst, so that the production cost is significantly reduced, the sulfur resistance and the heat inactivation resistance of the catalyst are improved, and the catalytic activity of the catalyst in low-temperature oxidation reaction is effectively improved.

Description

technical field [0001] The invention belongs to diesel engine tail gas purification technology, in particular to a catalyst for purifying pollutants emitted by internal combustion engines and a preparation method thereof. Background technique [0002] Diesel engines have been widely used due to their large load capacity and high thermal efficiency. However, due to the limitation of the combustion method, the emission of PM (Particulate Matter) in the exhaust of diesel engines is relatively high, which is harmful to environmental safety and human health. For this reason, many countries have formulated strict emission regulations to limit the PM emissions of diesel engines. The increasingly stringent emission regulations have actually promoted the progress of PM emission control technology, and the industry generally believes that diesel engine exhaust after-treatment technology has become a national standard. Ⅳ emission standards, or technical measures that must be adopted f...

Claims

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Application Information

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IPC IPC(8): B01J31/38B01D53/94B01D53/56B01D53/62F01N3/10F01N3/28
CPCB01D53/944B01D2258/01B01J31/38F01N3/103F01N3/2803Y02A50/20
Inventor 吕刚朱彦涛宋崇林李博
Owner TIANJIN UNIV
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