Oxidation type catalyst for diesel engine exhaust aftertreatment and manufacturing method of oxidation type catalyst

An oxidation catalyst and exhaust post-treatment technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as catalytic performance discounts, and achieve Strong adhesion, efficient handling, and reduced use costs

Pending Publication Date: 2022-03-29
广东加南环保生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above scheme produces catalyst particles. During the process of coating on DOC or DPF carriers, the particles need to be bound to DOC or DPF carriers by means of additives such as binders. The sintering process has a chemical reaction with the catalyst particles, and its catalytic performance is greatly reduced after coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of cerium-zirconium composite oxide: Dissolve cerium nitrate, zirconium nitrate, and citric acid in water at a molar ratio of 1:0.25:1.25 to form a solution with a total concentration of metal ions of 1.5mol / L. Heating in a water bath at 100°C, evaporating and concentrating to dryness, heating to 600°C at a rate of 100°C / hour and keeping it warm for 1 hour, and solid ball milling for 16 hours after cooling to obtain a cerium-zirconium composite oxide.

[0024] Preparation of alumina sol: Mix pseudo-boehmite, concentrated nitric acid, and water in a mass ratio of 1:0.75:10, then heat and stir on a water bath at 80°C for 6 hours to prepare alumina sol.

[0025] Inner coating coating: prepare the inner coating coating liquid according to the proportion of 9% cerium-zirconium composite oxide, 15% alumina sol, and 76% water by weight percentage, and suck the coating liquid into the DOC carrier under the negative pressure under the stirring state In the honeycomb ...

Embodiment 2

[0028] Preparation of cerium-zirconium composite oxide: Dissolve cerium nitrate, zirconium nitrate, and citric acid in water at a molar ratio of 1:0.25:1.25 to form a solution with a total concentration of metal ions of 1.5mol / L. Heating, evaporating and concentrating in a water bath at 100°C to dryness, heating to 600°C at a rate of 100°C / hour and keeping the temperature for 1 hour, and the obtained solid ball milled for 16 hours to cerium-zirconium composite oxide.

[0029] Preparation of alumina sol: Mix pseudo-boehmite, concentrated nitric acid, and water in a mass ratio of 1:0.75:10, then heat and stir on a water bath at 80°C for 6 hours to prepare alumina sol.

[0030] Inner coating coating: Prepare the inner coating coating liquid according to the proportion of 9% cerium-zirconium composite oxide, 15% alumina sol, and 76% water by weight, and suck the coating liquid into the DOC carrier under the negative pressure under the stirring state In the honeycomb hole, the nega...

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Abstract

The invention provides an oxidation catalyst for diesel engine exhaust aftertreatment and a manufacturing method of the oxidation catalyst. The oxidation catalyst can efficiently treat particulate matter, HC, CO and NOx, and a catalyst of the oxidation catalyst has firm binding power. The oxidation catalyst comprises a DOC carrier and a catalyst coating coated in the DOC carrier, and the catalyst coating takes a cerium-zirconium composite oxide as an inner coating and a lanthanum-manganese-copper composite oxide as an outer coating. The manufacturing method comprises the following steps: preparing the cerium-zirconium composite oxide powder, coating the cerium-zirconium composite oxide powder and the aluminum oxide sol with the inner coating, coating the lanthanum-manganese-copper nitrate solution with the outer coating, and sintering.

Description

technical field [0001] The invention relates to an oxidation catalytic converter for aftertreatment of exhaust gas of a diesel engine and a manufacturing method thereof. Background technique [0002] The existing oxidation catalyst DOC used in the market for aftertreatment of diesel engine exhaust uses a catalyst that is coated with a noble metal catalyst on the coating of a co-catalyst such as alumina / cerium oxide. The amount of noble metal coating generally needs to be 10-40g / ft 3 , the larger the coating amount of noble metal, the better the catalytic effect. However, precious metals are expensive and unaffordable for users. [0003] CN101939097A relates to a catalyst system free or substantially free of platinum group metals for the reaction of nitrogen oxides, carbon monoxide, hydrocarbons and sulfur, comprising a substrate and a washcoat comprising at least one oxide solid , the oxide solid comprises one or more materials selected from the group consisting of support...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J37/02B01D53/94B01D53/56B01D53/62B01D53/72
CPCB01J23/8892B01J37/0244B01D53/945
Inventor 黄育新黄芝霖冯凯詹楚龙赖乙乐彭元发黄能升张朝佳
Owner 广东加南环保生物科技有限公司
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