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Method for coating DPF with sandwich type catalyst coating, obtained product and application

A catalyst coating, sandwich-type technology, applied in the direction of chemical instruments and methods, catalyst activation/preparation, heterogeneous catalyst chemical elements, etc., can solve the problems of easy loss and potassium loss, and achieve improved combustion activity, high activity and Effect of stability, good cycle stability

Active Publication Date: 2021-11-12
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that the K-based catalyst is easy to interact with the carrier to form fixed potassium with poor activity, and the potassium is exposed to the surface and is easy to lose, the present invention provides a method for coating a sandwich-type catalyst coating on the DPF. Three-layer coating is applied, in which the potassium catalyst is located in the second layer of coating to form a sandwich structure, which not only solves the problem of potassium interacting with the carrier to form a fixed potassium with poor activity, but also solves the problem of potassium loss on the surface layer, And the third coating is loaded with a small amount of precious metals, which can significantly improve the activity of catalytic soot combustion when combined with potassium catalysts

Method used

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  • Method for coating DPF with sandwich type catalyst coating, obtained product and application
  • Method for coating DPF with sandwich type catalyst coating, obtained product and application
  • Method for coating DPF with sandwich type catalyst coating, obtained product and application

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A method for coating a sandwich-type catalyst coating on a DPF, the specific steps of which are:

[0050] a. First weigh 4.0 g of cerium-based composite oxide (CeO 2 : ZrO 2 : La 2 o 3 : Nd 2 o 3 (mass ratio = 80:80:50:50) was added to 100 ml of deionized water, stirred for 2 h and then ball-milled for 9 h to obtain a suspension with an average particle size of 390 nm, and continued to stir for 1.5 h; weighed 0.07 g of carboxyl Sodium methylcellulose was dissolved in 10 mL of deionized water, mixed with the cerium-based composite oxide suspension, and stirred for 2 h to obtain the slurry of the first coating; according to the coating amount of the active component 8 g / L , the slurry of the first coating was quantitatively and uniformly coated on the cordierite honeycomb ceramic carrier; the coated cordierite honeycomb ceramic carrier was dried at 70 °C for 5 h, and then transferred to an oven at 110 °C Dry for 5 h. A cordierite honeycomb ceramic carrier coated wi...

Embodiment 2

[0054] A method for coating a sandwich-type catalyst coating on a DPF, the specific steps of which are:

[0055] a. First weigh 4.0 g of cerium-based composite oxide (CeO 2 : ZrO 2 : La 2 o 3 : Y 2 o 3 (mass ratio=20:80:13:13) was added to 190 mL deionized water, stirred for 2 h and ball milled for 6 h to obtain a suspension with an average particle size of 430 nm; weigh 0.05 g sodium carboxymethyl cellulose to dissolve In 10 mL of deionized water, mixed with the cerium-based composite oxide suspension, and continued to stir for 2.5 hours to obtain the slurry of the first coating; according to the coating amount of the active component 8 g / L, the prepared second coating The slurry of the first coating was quantitatively and evenly coated on the cordierite honeycomb ceramic carrier; the coated cordierite honeycomb ceramic carrier was dried at 70 °C for 5 h, and then transferred to an oven at 110 °C for 5 h. A cordierite honeycomb ceramic carrier coated with the first laye...

Embodiment 3

[0059] A method for coating a sandwich-type catalyst coating on a DPF, the specific steps of which are:

[0060] a. First weigh 6.0 g of cerium-based composite oxide (CeO 2 : PrO 2 : ZrO 2 : La 2 o 3 : Nd 2 o 3 : Y 2 o 3 mass ratio=80:50:80:50:50:13) into 100 mL of deionized water, stirred for 3 h and ball milled for 12 h to obtain a suspension with an average particle size of 380 nm; weigh 0.5 g of carboxymethyl Sodium cellulose was dissolved in 10 mL of deionized water, mixed with the cerium-based composite oxide suspension, and stirred for 3 h to obtain the slurry of the first coating; according to the coating amount of the active component 5 g / L, the prepared The slurry of the first coating was quantitatively coated on the cordierite carrier; the coated cordierite carrier was dried at 90 °C for 1 h, and then transferred to an oven at 100 °C for 10 h. A cordierite carrier coated with the first layer of coating is obtained.

[0061] b. First weigh 6.0 g of cerium-b...

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Abstract

The invention discloses a method for coating a DPF with a sandwich type catalyst coating, an obtained product and application of the DPF. The method comprises the steps that the DPF is coated with a layer of cerium-based composite oxide, then the DPF is coated with a layer of potassium-containing cerium-based composite oxide, and finally the outermost layer is coated with a layer of cerium-based composite oxide containing a small amount of precious metal; and drying and roasting are implemented to obtain the sandwich type CDPF. According to the invention, the sandwich-type coating is coated on the DPF, so that a potassium active component with excellent catalytic performance can be fixed in the middle of an interlayer, potassium can be prevented from interacting with a carrier to form fixed potassium with poor activity, and the loss of potassium exposed on the surface layer can be avoided. According to the method, the total loading capacity of the coating can reach 15-45 g / L, and the prepared CDPF is excellent in performance and has huge market application potential.

Description

technical field [0001] The present invention relates to a method for coating a sandwich-type catalyst coating on a DPF, and also relates to the DPF (CDPF) coated with a sandwich-type catalyst coating prepared according to the method, and its application in catalytic soot combustion , belongs to the technical field of catalyst preparation. Background technique [0002] The excessive emission of soot particulate matter (PM) in the exhaust pollutants of diesel vehicles leads to serious environmental pollution problems, and is one of the chief culprits of smog weather, which seriously endangers human health. With the implementation of China VI, the limits on PM emissions are becoming more and more stringent, and diesel particulate filter technology (DPF) is one of the most widely and effective PM removal technologies at this stage. However, the disadvantages of DPF are: PM gradually deposits on the wall of the hole with the increase of exhaust volume, which increases exhaust re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26B01J23/10B01J23/63B01J37/02F01N3/022F01N3/035F01N3/20F01N3/28
CPCB01J31/26B01J23/10B01J23/63B01J23/002B01J37/0219B01J37/0244F01N3/035F01N3/022F01N3/20F01N3/2803B01J2523/00B01J2523/3706B01J2523/3712B01J2523/3725B01J2523/48B01J2523/3718B01J2523/36B01J2523/824
Inventor 张昭良吕亚楠张正辉辛颖王进
Owner UNIV OF JINAN
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