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Oxidation catalyst for soot particles of diesel and preparation method thereof

A soot particle and catalyst technology, which is applied in the field of oxidation catalyst and its preparation, can solve the problems of affecting oxygen storage capacity, specific surface pore volume deterioration and collapse, and poor high temperature stability, so as to improve dispersion and achieve coating uniformity , no plugging effect

Inactive Publication Date: 2019-01-15
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Wall-flow honeycomb ceramic filter coating catalysts mainly contain catalytically active noble metals (PGM) and their catalytic materials, especially for the oxidation of PM, more attention needs to be paid to the interaction between catalytic materials and PM, and cerium oxide material as a A good oxygen storage material has been widely used in the field of automobile exhaust purification, but its high temperature stability is poor. After high temperature hydrothermal aging, the specific surface and its pore volume deteriorate and collapse seriously, which seriously affects the storage capacity of this material. Oxygen capacity also greatly limits the full application of its performance

Method used

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  • Oxidation catalyst for soot particles of diesel and preparation method thereof
  • Oxidation catalyst for soot particles of diesel and preparation method thereof
  • Oxidation catalyst for soot particles of diesel and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Catalyst preparation one, comprises the steps:

[0034] 1) Slurry configuration: according to the preferred coating material cerium oxide-praseodymium oxide-lanthanum oxide, its oxide weight composition percentage: 90:5:5, choose platinum nitrate and palladium nitrate salt solution, pH: 3.0, D 90 =7.0 μm, the solid content is 13%, stirred and ball milled.

[0035] 2) Coating: Coating is carried out according to the loading amount of 20g / L coating, and the loading amount of precious metal is 3.0g / ft 3 .

[0036] 3) Drying: Dry the coated catalyst at 105°C for 2.0 hours.

[0037] 4) Roasting: put the dried catalyst in a mesh belt furnace for calcination, the atmosphere is air, and calcine at 650° C. for 4 hours to complete the calcination process. The coating amount of the catalytic material on a dry basis is 18 g / L.

Embodiment 2

[0039] Catalyst preparation two, comprises the steps:

[0040] 1) The configuration of the slurry: according to the preferred coating material ceria-praseodymia-zirconia, its oxide weight composition percentage: 80:5:15, choose platinum nitrate and palladium nitrate salt solution, pH: 3.5, D 90 =7.3 μm, the solid content is 13%, stirred and ball milled.

[0041] 2) Coating: Coating is carried out according to the loading amount of 20g / L coating, and the loading amount of precious metal is 1.0g / ft 3 .

[0042] 3) Drying: Dry the coated catalyst at 105°C for 2.5 hours.

[0043] 4) Roasting: Put the dried catalyst in a mesh belt furnace for calcination, the atmosphere is air, and calcine at 650° C. for 4 hours to complete the calcination process, and the coating amount of the catalytic material on a dry basis is 22 g / L.

Embodiment 3

[0045] Catalyst preparation three, comprises the steps:

[0046] 1) Slurry configuration: according to the preferred coating material cerium oxide-praseodymium oxide-silver oxide, its oxide weight composition percentage: 95:4:1, choose platinum nitrate and palladium nitrate salt solution, pH: 4.0, D 90 =6.2 μm, the solid content was 12.3%, stirred and ball milled.

[0047] 2) Coating: Coating is carried out according to the loading amount of 20g / L coating, and the loading amount of precious metal is 1.0g / ft 3 .

[0048] 3) Drying: Dry the coated catalyst at 105°C for 3 hours.

[0049] 4) Roasting: put the dried catalyst in a mesh belt furnace for calcination, the atmosphere is air, and calcine at 650° C. for 4 hours to complete the calcination process. The coating amount of the catalytic material on a dry basis is 19.0 g / L.

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Abstract

The invention discloses an oxidation catalyst for soot particles of a diesel and a preparation method thereof. The oxidation catalyst is prepared from a coating material and an active component impregnated on the coating material. The active component is prepared from a noble metal salt containing Pt and Pd. The total content of noble metals in the catalyst is 0.5 to 3 g / ft3, and a weight ratio ofthe noble metal Pt and the noble metal Pd is 2:1 to 10:1. The coating material is a high-cerium-content composite metal oxide, wherein the content of cerium oxide is greater than or equal to 80% by weight. The preparation method comprises the following steps: directly mixing the coating material and the noble metal salt solution of the active component; performing stirring and ball milling, and controlling and adjusting a pH value to 1.5 to 5.5, a particle diameter D50 to 2 to 7 [mu]m and a solid content to no more than 20%; and coating a carrier with a mixture obtained in the previous step and then performing calcinations so as to obtain the catalyst. The carrier slurry of the catalyst in the invention is uniform in distribution and free of the phenomenon of plugging; and the catalyst has low back pressure and high oxygen storage capacity in a practical exhaust gas purification and treatment system, and can achieve the purpose of rapidly oxidizing PM at a low temperature.

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, and in particular to an oxidized catalyst with good low-temperature catalytic oxidation of diesel soot particles (PM) and its preparation technology. Background technique [0002] Diesel engines have high thermal efficiency, and after the fuel is oxidized at high temperature in the cylinder, a large amount of heat is released. However, due to the lack of oxygen in the layout or high temperature, part of the fuel is degraded and dehydrogenated to form small solid particles mainly composed of carbon, that is, PM; Insufficient, together with the oil, the soluble organic matter is fused to produce a large amount of soot particles, that is, SOF; in addition, there are some inorganic substances such as sulfate particles, which are mixed together to form a large amount of b...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J23/66B01J37/02F01N3/10
CPCB01J23/63B01J23/002B01J23/66B01J37/0215B01J2523/00F01N3/106B01J2523/18B01J2523/3712B01J2523/3718B01J2523/48B01J2523/3706
Inventor 魏宽冯锡王瑞芳吴干学王云李云陈启章陈耀强
Owner SINOCAT ENVIRONMENTAL TECH
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