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Catalyst for particulate-oxidation catalytic converter of direct-injection internal combustion engine in lean-combustion cylinder

An oxidation catalyst, cylinder direct injection technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst activation/preparation, etc., to meet the requirements of low cost, lower pH value, Effect of improving sulfur resistance performance

Active Publication Date: 2013-11-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The "substituted perovskite composite oxide" material has good catalytic oxidation performance and sulfur resistance performance. This kind of perovskite composite oxide may be used as a substitute for noble metal catalysts, but its application performance on particulate oxidation catalysts And there are many difficult problems in composition optimization strategy, content of the present invention proposes in order to solve this problem

Method used

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  • Catalyst for particulate-oxidation catalytic converter of direct-injection internal combustion engine in lean-combustion cylinder
  • Catalyst for particulate-oxidation catalytic converter of direct-injection internal combustion engine in lean-combustion cylinder

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Determination of the amount of preparation and supported catalyst raw materials

[0028] The design requires that the molar percentage of La atoms and Ce atoms at the A site of the perovskite structure be: 80%:20%; the molar percentage of the Mn atoms and Bi atoms at the B site of the perovskite structure be: 80%:20%; the catalyst and Coating matrix γ-Al 2 o 3 The mass percentage is: 30%:70%; the entire coating matrix γ-Al 2 o 3 Medium pure γ-Al 2 o 3 γ-Al produced by calcination of powder and pseudoboehmite 2 o 3 The mass ratio is: 50%:50%; the mass percentage of the total mass of the coating and the metal carrier of the particulate oxidation catalyst is: 10%:90%; every 100g catalyst powder needs 10g of polyethylene glycol with an average molecular weight of 4000 . The mass of the metal carrier that needs to be loaded with the coating is planned to be 9000g. According to the conversion ratio, it is calculated that 381g of lanthanum nitrate, 95.5g of cerium ...

Embodiment 2

[0036] (1) Determination of the amount of preparation and supported catalyst raw materials

[0037] The design requires that the molar percentage of La atoms and Ce atoms at the A site of the perovskite structure be: 80%:20%; the molar percentage of the Mn atoms and Bi atoms at the B site of the perovskite structure be: 70%:30%; the catalyst and Coating matrix γ-Al 2 o 3 The mass percentage is: 20%:80%; the entire coating matrix γ-Al 2 o 3 Medium pure γ-Al 2 o 3 γ-Al produced by calcination of powder and pseudoboehmite 2 o 3 The mass ratio is: 70%: 30%; the mass percentage of the total mass of the coating and the metal carrier of the particulate oxidation catalyst is: 20%: 80%; every 100g of catalyst powder needs 20g of polyethylene glycol with an average molecular weight of 4000 . The mass of the metal carrier that needs to be loaded with the coating is planned to be 8000g, and according to the conversion ratio, it is calculated that the preparation and loading of the...

Embodiment 3

[0045] (1) Determination of the amount of preparation and supported catalyst raw materials

[0046] The design requires that the molar percentage of La atoms and Ce atoms at the A site of the perovskite structure be: 90%:10%; the molar percentage of the Mn atoms and Bi atoms at the B site of the perovskite structure be: 70%:30%; the catalyst and Coating matrix γ-Al 2 o 3 The mass percentage is: 20%:80%; the entire coating matrix γ-Al 2 o 3 Medium pure γ-Al 2 o 3 γ-Al produced by calcination of powder and pseudoboehmite 2 o 3 The mass ratio is: 70%:30%; the mass percentage of the total mass of the coating and the metal carrier of the particulate oxidation catalyst is: 20%:80%; every 100g catalyst powder needs 15g of polyethylene glycol with an average molecular weight of 4000 . The mass of the metal carrier that needs to be loaded with the coating is planned to be 8000g, and according to the conversion ratio, it is calculated that the preparation and loading of the cata...

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Abstract

The invention discloses a catalyst for a particulate-oxidation catalytic converter of a direct-injection internal combustion engine in a lean-combustion cylinder. The catalyst is characterized in that LaMnO3 perovskite compound oxide with partially substituted A-site cerium and B-site bismuth is adopted as a catalyst, the molar percentage ratio of Ce ions to La ions at the A site in the perovskite structure is 10-30% / 90-70%; and molar percentage ratio of Bi ions and Mn ions at the B site in the perovskite structure is 10-50% / 90-50%. Gamma-Al2O3 is adopted as a coating substrate, and a metal carrier of the particulate-oxidation catalytic converter is adopted as a load target carrier. A preparation and loading process comprises the following steps of: determination of the using amount of materials of the catalyst, preparation of the catalyst, preparation of coating slurry and loading. The catalyst purifies particulates in exhausted gas of the direct-injection internal combustion engine in the lean-combustion cylinder after being loaded on the particulate-oxidation catalytic converter with the metal carrier. The partially substituted LaMnO3 perovskite compound oxide is used for replacing noble metal, so that the material cost of the catalyst is obviously reduced and the sulfur resistance is greatly improved.

Description

technical field [0001] The invention belongs to a particle purification catalyst for an internal combustion engine, and in particular relates to a catalyst for a particle oxidation catalyst of a lean-burn in-cylinder direct-injection internal combustion engine and a preparation and loading method thereof. Background technique [0002] Due to diffusion combustion, lean-burn direct-injection internal combustion engines will inevitably produce a large number of soot particles (Particulate Matter-PM), which are discharged into the atmosphere through exhaust gas. Moreover, the aerodynamic diameter of such particles is less than 2.5 microns, which belongs to ultrafine particles and is harmful to the environment and human health. With the increasingly stringent domestic and foreign motor vehicle emission regulations, the research on particulate emission purification technology of lean-burn direct injection internal combustion engines has become a hot spot. Among them, the particul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J37/00
Inventor 宋崇林吕刚宋金瓯宾峰张清茂
Owner TIANJIN UNIV