Preparation method of a light-duty diesel vehicle oxidation particulate filter

A technology for particle traps and diesel vehicles, applied in the field of traps, can solve problems such as poor capture efficiency and fast aging, and achieve the effects of optimized components, good dispersion, and enhanced low-temperature processing capabilities

Active Publication Date: 2019-07-05
SICHUAN MIANYANG HUAYUANHANGSHENG ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the purposes of the present invention is to provide a method for preparing a particle trap, which can maintain a stable state of the mixed slurry, and at the same time solve the problems of poor capture efficiency and rapid aging of the particle trap in the prior art

Method used

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  • Preparation method of a light-duty diesel vehicle oxidation particulate filter
  • Preparation method of a light-duty diesel vehicle oxidation particulate filter
  • Preparation method of a light-duty diesel vehicle oxidation particulate filter

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preparation example Construction

[0030] The invention provides a preparation method of an oxidized particulate filter for a light-duty diesel vehicle, comprising the following steps:

[0031] (1) Mix the filter material of the trap with water and add the precursor solution of precious metal to obtain a mixed slurry; the filter material is preferably one or more mixtures of honeycomb ceramic base material, ceramic fiber material or molecular sieve. The precursor solution of noble metal is preferably a mixed solution of one or both of palladium nitrate and rhodium nitrate; the amount of noble metal added in the mixed slurry is 0.176g / L~0.353g / L, and the water content of the mixed slurry is 50% w / w~60%w / w.

[0032] (2) Adjust the pH value of the mixed slurry to keep it weakly alkaline, preferably the pH value of the mixed slurry is 8.2~8.6. Stir for 10h~30h; obtain the active slurry that completes the ion exchange;

[0033] (3) The active slurry is filtered, dried and calcined in sequence;

[0034] The method...

Embodiment 1

[0040] A preparation method of an oxidation-type particulate filter for a light-duty diesel vehicle, comprising the following steps:

[0041] (1) Add 1200g of water to 1000g of honeycomb ceramic base material powder and mix well, then add palladium nitrate, the content of palladium ions is 0.2g / L; the water content of the mixed slurry is 55%.

[0042] (2) Add an acid-base regulator to make the pH of the mixed slurry 8.2~8.6, and stir for 20 hours; obtain an active slurry that has completed ion exchange;

[0043] (3) The active slurry is filtered, dried and calcined in sequence.

[0044] The drying method is as follows: disperse the filter cake of the active slurry into small pieces and put them in a drying oven, adjust the drying temperature to 90°C, and after the surface is dry, disperse and pulverize it; then adjust the drying temperature to 170°C, and dry for 12 Hour.

[0045] The primary calcination method is as follows: pulverize the dried filter cake and calcine at 600...

Embodiment 2

[0049] A preparation method of an oxidation-type particulate filter for a light-duty diesel vehicle, comprising the following steps:

[0050] (1) Add 1200g of water to 1000g of ceramic fiber material powder and mix well, then add rhodium nitrate, the content of rhodium ions is 0.25g / L; the water content of the mixed slurry is 55%.

[0051] (2) Add an acid-base regulator to make the pH of the mixed slurry 8.4, and stir for 18 hours; obtain an active slurry that has completed ion exchange;

[0052] (3) The active slurry is filtered, dried and calcined in sequence.

[0053] The drying method is as follows: disperse the filter cake of the active slurry into small pieces and put it in a drying oven, adjust the drying temperature to 80°C, and after the surface is dry, disperse and pulverize it; then adjust the drying temperature to 170°C, and dry for 12 Hour.

[0054] The primary calcination method is as follows: pulverize the dried filter cake, and calcine at 600° C. for 4 hours....

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Abstract

The invention discloses a preparation method of an oxidized particulate filter for light diesel vehicles. The preparation method includes the steps of adding water into filtering materials and mixing the filtering materials in water with a precursor solution of precious metal; regulating a pH value of mixed slurry to keep alkalescency thereof so as to obtain ion-exchanged active slurry; filtering the active slurry prior to drying and primary roasting in sequence; cooling and grinding catalyst powder to obtain catalyst slurry and applying the catalyst slurry to a carrier to conduct secondary roasting. The preparation method of the oxidized particulate filter for the light diesel vehicles has the advantages that according to the preparation method, the catalyst slurry is applied to the carrier, and the oxidized particulate filter is generated through roasting; both particulate sizes of the catalyst slurry and components of the catalyst are optimized, so that the filter obtained by the preparation method can filter small particulates without backpressure increasing, filtering efficiency of the filter can be improved, low-temperature PM treatment capability of the filter at a cold start stage is enhanced, and the problem that small particulates of exhaust gas fail to be filtered is solved.

Description

technical field [0001] The invention relates to the technical field of traps, in particular to a preparation method of an oxidized particle trap for a light-duty diesel vehicle. Background technique [0002] At present, about 60% of the urban air pollution in my country is mainly caused by motor vehicle pollution. The soot and particulates (PM) in diesel vehicles, including some toxic polycyclic aromatic hydrocarbons, are serious emission problems and have become the bottleneck factor in the control of air pollution. Along with the increase in the number of diesel engines, rising oil prices and stricter European emission regulations, people are paying more and more attention to the impact of their exhaust gas on air quality. How to effectively control the harmful gas emissions from diesel engines has always been a common concern. [0003] Various types of engines, such as gasoline engines, diesel engines, and other fuel gas internal combustion engines, include gas pollutan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D46/00
CPCB01D46/0001B01D46/0027
Inventor 华家本李世宁魏东胡长青胡俊
Owner SICHUAN MIANYANG HUAYUANHANGSHENG ENVIRONMENTAL TECH
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