DPF with low-backpressure and low-initiation-temperature catalyst layer and preparation process of DPF

A technology of light-off temperature and preparation process is applied in the field of catalyst research and preparation, and the research and preparation of automobile exhaust gas treatment catalysts. , to achieve the effect of improving the utilization rate of precious metals, uniform distribution of precious metal particles, and low cost

Active Publication Date: 2018-09-21
SINOCAT ENVIRONMENTAL TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] U.S. Patent 9517454B2 discloses a diesel particulate filter, which mentions that a layer of porous coating with a bridging form is formed on the surface of the DPF air inlet channel, and its main feature is to form sol-gel particles in the preparation of the coating material , which will help the slurry to achieve uniform coating on the DPF inlet wall, and will help reduce the back pressure during the entire post-treatment operation. Its main disadvantage is the catalytic oxidation ability of PM and PN and its high temperature resistance. Insufficient capaci

Method used

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  • DPF with low-backpressure and low-initiation-temperature catalyst layer and preparation process of DPF

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preparation example Construction

[0034] 1) For the preparation of the coating layer glue, add soluble aluminum salt or alumina according to a certain mass concentration requirement into the water-alcohol solvent system, the mass ratio to the solvent system is ≤30%, and then add 0.1wt% to 0.1% by weight of solvent 1wt% soluble acid, after the high-energy ball milling process, obtains the slurry A; the ionic mixed solution formed by the soluble salt of cerium and zirconium according to a certain molar ratio is added to the slurry A, and the slurry B is formed through electromagnetic stirring, Then the slurry B is aged and high-energy ultrasonic vibration is performed at the same time to form the glue C with gel particles.

[0035] 2) Coating of glue solution: dipping and coating glue solution C on the wall surface of the DPF air inlet of the wall-flow diesel particulate filter and into the pores in the wall, and blowing back with compressed airflow, that is, the airflow enters from the outlet end and removes Ex...

Embodiment 1

[0049] Coating slurry configuration, coating and precious metal particle impregnation process:

[0050] 1) Glue configuration: add pseudo-boehmite to deionized water at 20wt%, add 0.1wt% citric acid, and perform high-energy ball milling. The speed requirement is 1000r / min. After about 60min, add a mixture of cerium nitrate and zirconium nitrate Solution, the molar ratio of cerium nitrate and zirconium nitrate is 4:1, then continue to stir electromagnetically, the stirring rate is 200r / min, the time is about 30min, and finally aging, high-energy ultrasonic oscillation, working frequency 50KHz, power 100W, temperature control At 50° C., the solid content was adjusted to 15 wt % for 12 hours.

[0051] 2) Coating of glue solution: apply the aged glue solution to the wall surface of the air inlet of the wall-flow diesel particulate filter and the pores in the wall by dipping method, and blow back with compressed air flow, To remove excess glue, and then dry the coated DPF in a hot...

Embodiment 2

[0054] Coating slurry configuration, coating and precious metal particle impregnation process:

[0055] 1) Glue configuration: add pseudoboehmite to deionized water at 20wt%, add 1.0wt% citric acid, and perform high-energy ball milling. The speed requirement is 1000r / min. After about 60min, add a mixture of cerium nitrate and zirconium nitrate Solution, the molar ratio of cerium nitrate and zirconium nitrate is 1:1, then continue to stir electromagnetically, the stirring rate is 200r / min, the time is about 30min, and finally aging treatment, high-energy ultrasonic oscillation, working frequency 50KHz, power 100W, temperature The temperature is controlled at 50°C, the solid content is adjusted to 15wt%, and the time is 12h.

[0056] 2) Glue coating: the aged glue is dipped and coated on the wall surface of the air inlet of the wall-flow diesel particulate filter and in the pores in the wall by dipping method, and blown back with compressed airflow , to remove excess glue, and ...

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Abstract

The invention provides a DPF with a low-backpressure and low-initiation-temperature catalyst layer and a preparation process of the DPF. The invention discloses the DPF and the preparation process ofthe DPF, wherein the DPF is used for catching, purifying and conducting low-temperature catalytic oxidation on PM and PN particles in tail gas of diesel vehicles and has the low-backpressure catalystlayer. The preparation process includes the steps that soluble aluminum salt or aluminum oxide is added in a water-alcohol solvent system, and slurry A is obtained through high energy ball milling; soluble salt of cerium and zirconium is prepared into an ionic type mixed solution, the solution is added in the slurry A, slurry B is prepared through stirring, and high energy ultrasonic oscillation is conducted while the slurry B is aged, and a glue solution C with gel particles is formed; then, the glue solution C is dipped onto the wall face of a wall-flow type DPF gas inlet and holes in the wall through the dipping process, back flushing is conducted through gas flow finally so that the redundant glue solution C can be removed, a solution with active precious metal ions is dipped in the dried DPF with a coating layer in the form of gas mist spray, and a diesel particle catcher which can conduct low-temperature catalytic oxidation on PM and PN and has the low-backpressure characteristicis obtained through drying and roasting.

Description

technical field [0001] The invention belongs to the technical field of catalyst research and preparation, in particular to the technical field of motor vehicle exhaust treatment catalyst research and preparation, in particular to a DPF with a low back pressure and low light-off temperature catalytic layer and a preparation process thereof. Background technique [0002] Diesel engine has the obvious advantages of high thermal efficiency and good economy. Under lean combustion conditions, it will produce a large number of soot particles, the so-called soot particulate matter (Particulate Matter, referred to as: PM), and a large number of PN (Particulate Number, referred to as PN), causing serious harm to human health, especially to the human respiratory tract and lungs. Therefore, with the continuous development of the automobile industry and the strengthening of people's awareness of environmental protection, national regulations on PM and PN emitted by automobile exhaust The...

Claims

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Application Information

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IPC IPC(8): F01N3/035B01D46/00B01D53/94B01J23/44B01J37/02
CPCB01D46/0001B01D46/0027B01D53/9413F01N3/035B01J23/44B01J37/0234B01D2258/012B01D2258/01B01D2255/2065B01D2255/1023B01D2255/2092B01D2255/20715B01D2255/1021B01D46/82
Inventor 魏宽王云王瑞芳杨娅吴干学冯锡张艳华李云陈启章
Owner SINOCAT ENVIRONMENTAL TECH
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