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Nano noble metal catalyst for automobile exhaust purification and preparation method thereof

A precious metal catalyst, automobile exhaust technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of low utilization rate of precious metal, low catalyst stability, Problems such as low precious metal content, to achieve economic cost savings, high oxygen storage capacity, and low precious metal content

Pending Publication Date: 2020-09-18
重庆博海众科环境技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the purpose of the present invention is to provide a nano-precious metal catalyst with simple preparation process, high stability and low content of precious metals, aiming at the disadvantages of complex preparation process, low catalyst stability and low precious metal utilization rate of the current automobile exhaust three-way catalyst. Three-way catalyst and preparation method thereof

Method used

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  • Nano noble metal catalyst for automobile exhaust purification and preparation method thereof

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preparation example Construction

[0020] The invention also discloses a method for preparing a nano-precious metal catalyst for automobile exhaust purification, comprising the following steps:

[0021] a. Preparation of coating slurry for different nano-noble metal oxygen storage materials: mix appropriate amount of water, activated alumina, and cerium-zirconium oxide, add rare earth additives and dispersants, stir well, add noble metal salt solution, and adjust the pH value to 3 ~4, finally add the binder, stir for 6~12 hours, and ball mill for 30~60 minutes to obtain the coating solution; in this way, the coating solution of each layer of coating is prepared by adding different precious metal salt solutions; prepared by adding different precious metal salt solutions The coating slurry containing different noble metals is used to coat the slurry on the honeycomb ceramics to form oxygen storage material coatings containing different kinds of nanometer noble metals. The purpose of ball milling is to obtain coat...

Embodiment 1

[0026] (1) Preparation of Pd layer slurry: After dissolving 12g of praseodymium nitrate and 0.6g of polyvinyl alcohol in 180g of water, add 73g of cerium-zirconium solid solution A and 31g of alumina to mix, wherein the component of cerium-zirconium solid solution A is 60% CeO 2 -40%ZrO 2 , the alumina component is 4% La 2 o 3 -96% Al 2 o 3 After stirring evenly, take 6g of palladium nitrate solution with a concentration of 17.91%, slowly drop it into the slurry, adjust the pH to 3, add a binder, stir for 6h, and ball mill for 30min to prepare the Pd layer slurry.

[0027] (2) Preparation of Rh layer slurry: After dissolving 9g of praseodymium nitrate and 0.5g of polyvinyl alcohol in 150g of water, add 50g of cerium-zirconium solid solution B and 34g of alumina and mix, wherein the component of cerium-zirconium solid solution B is 30% CeO 2 -70%ZrO 2 , the alumina composition is the same as the Pd layer is 4% La 2 o 3 -96% Al 2 o 3 After stirring evenly, take 1.3g of ...

Embodiment 2

[0033] (1) Preparation of Pd layer slurry: after dissolving 6g praseodymium nitrate, 6g cerium nitrate and 0.6g polyvinyl alcohol in 180g water, add 63g cerium-zirconium solid solution A and 42g alumina to mix, after stirring evenly, get 6g concentration to be 17.91% palladium nitrate solution was slowly added dropwise to the slurry, the pH was adjusted to 4, a binder was added, after stirring for 6 hours, the Pd layer slurry was prepared by ball milling for 30 minutes.

[0034] (2) Preparation of Rh layer slurry: After dissolving 5g of lanthanum nitrate, 6g of yttrium nitrate and 0.5g of polyvinyl alcohol in 150g of water, add 59g of cerium-zirconium solid solution B and 25g of alumina to mix, stir well, and take 1.3g of concentration Slowly add a 9.47% rhodium nitrate solution into the slurry, adjust the pH to 3-4, add a binder, stir for 6 hours, and ball mill for 30 minutes to prepare the Rh layer slurry.

[0035] (3) coating and roasting: with embodiment 1

[0036] Activi...

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Abstract

The invention discloses a nano noble metal catalyst for automobile exhaust purification. The catalyst comprises a honeycomb ceramic carrier and at least two layers of nano noble metal oxygen-storage material coatings loaded on the honeycomb ceramic carrier, and the noble metal types of the coatings are different. The catalyst has the characteristics of high activity and strong stability, the usednoble metal content is low, the economic cost is saved, and HC, CO and NOx can be effectively catalyzed and converted while the high oxygen-storage capacity is maintained.

Description

technical field [0001] The invention belongs to the technical field of environmental protection catalysis, and in particular relates to a nano-precious metal catalyst used for purifying automobile exhaust and a preparation method thereof. Background technique [0002] With the continuous popularization of automobiles in our country, automobile exhaust emissions are increasing day by day. Automobile exhaust contains a large amount of CO, HC and NOXx, which seriously endanger human health and the ecological environment. Therefore, reducing automobile exhaust pollution is an important part of atmospheric environmental governance. Installing automobile exhaust purifier is the most effective method of automobile exhaust treatment at present, and its key technology is the preparation of three-way catalyst. The three-way catalyst is usually prepared by using cordierite honeycomb as the substrate, coated with an active alumina coating with a large specific surface area as the carrie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J35/04B01J37/02B01D53/94B01D53/72B01D53/62B01D53/56
CPCB01J23/63B01J37/0244B01D53/945B01J35/56Y02A50/20
Inventor 王金波秦瑞香
Owner 重庆博海众科环境技术有限公司
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