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Oxidized type catalyzing system with good low-temperature ignition performance and preparation technology thereof

A catalytic system, oxidation-type technology, applied in catalyst activation/preparation, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve problems such as the lack of clear instructions for fuel light-off ability, and achieve good product performance stability and improvement. Excellent effect of concentration distribution and ignition performance

Active Publication Date: 2018-08-17
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is usually used in combination with Pd. On the one hand, it can greatly reduce the cost, and on the other hand, it can improve the stability of Pt particles. However, the addition of Pd will increase the light-off temperature of HC and CO, especially when using storage HC materials. even more so when
[0009] Patent WO2010 / 083313 discloses a DOC catalyst containing a three-layer catalytic coating, which mainly uses oxygen storage materials (OSC) and noble metals (Pt and Pd) separately to improve the ignition performance of HC and CO. Only the oxidation ability of HC and CO in the exhaust gas is strong, but there is no clear description of the ignition ability of fuel

Method used

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  • Oxidized type catalyzing system with good low-temperature ignition performance and preparation technology thereof
  • Oxidized type catalyzing system with good low-temperature ignition performance and preparation technology thereof
  • Oxidized type catalyzing system with good low-temperature ignition performance and preparation technology thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A process for preparing an oxidation-type catalytic system with good low-temperature light-off performance, comprising the following steps:

[0046] 1. Bottom layer slurry configuration and coating

[0047] 1) Slurry configuration: add alumina and acetic acid to deionized water in proportion, the weight ratio is 1:1:2, carry out adhesive ball milling, and then load the precious metal with a weight ratio of Pt:Pd=1:0 The catalytic material beta molecular sieve, alumina-silica is added to the binder. The amount of water added is calculated based on the solid content of 38wt%, pH: 4.2, high-energy ball milling for 20min, D 90 = 12.3 μm.

[0048] 2) Determination of solid content: Take 10 g of the slurry in the step and put it in a ceramic dry pot, and place it in a muffle furnace at a temperature of 500° C. for 7 minutes, and finally calculate the solid content to be 37.6 wt%.

[0049] 3) Coating application: Coating is carried out according to the loading amount of 80g...

Embodiment 2

[0065] A process for preparing an oxidation-type catalytic system with good low-temperature light-off performance, comprising the following steps:

[0066] 1. Bottom layer slurry configuration and coating

[0067] 1) Slurry configuration: Add alumina and acetic acid to deionized water in proportion, the weight ratio is 1:1:2, ball mill the adhesive, and then load the precious metal with a weight ratio of Pt:Pd=1:0 Catalytic materials alumina-lanthanum oxide and β molecular sieve are added to the binder. The amount of water added is calculated based on the solid content of 38wt%, pH: 4.5, high-energy ball milling for 20min, D 90 = 11.4 μm.

[0068] 2) Measurement of solid content: Take 10 g of the slurry in a ceramic dry pot, and place it in a muffle furnace at 500° C. for 5 minutes, and finally calculate the solid content to be 37.2 wt%.

[0069] 3) Coating application: Coating is carried out according to the loading amount of 80g / L coating, and the loading amount of precio...

Embodiment 3

[0085] A process for preparing an oxidized catalyst system with good low-temperature light-off performance, comprising the following steps:

[0086] 1. Bottom layer slurry configuration and coating

[0087] 1) Slurry configuration: Add alumina and acetic acid to deionized water in proportion, the weight ratio is 1:1:2, ball mill the adhesive, and then load the precious metal with a weight ratio of Pt:Pd=1:0 The cerium-doped β molecular sieve composite oxide of the catalytic material is added to the binder. The amount of water added is calculated based on the solid content of 38wt%, pH: 4.5, high-energy ball milling for 20min, D 90 = 11.4 μm.

[0088] 2) Measurement of solid content: Take 10 g of the slurry in a ceramic dry pot, and place it in a muffle furnace at 500° C. for 5 minutes of roasting, and finally calculate the solid content to be 37.8 wt%.

[0089] 3) Coating application: Coating is carried out according to the loading amount of 80g / L coating, and the loading a...

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Abstract

The invention discloses an oxidized type catalyzing system for purifying light-duty diesel vehicle tail gas and with good low-temperature ignition performance and a preparation technology thereof. A coating layer of the catalyst is formed by two layers, an area coating technology is utilized by the top layer to achieve the main purpose of quickly igniting fuel oil, and the fuel oil can be fully combusted; meanwhile, HC, CO and NO oxidizing conversion rates can be improved, a lot of heat can be released out, sufficient heat can be provided for a catalyzing unit CDPF at the midstream and downstream of a postprocessing system to perform initiative regeneration, and soot can be burned and eliminated. A carrier material is prepared from composite oxide, an active ingredient contains precious metal of Pt and Pd, and a total content is within 20 to 40g / ft<3>. The whole preparation technology is easy to control, and the catalyst has stable performance, has good low-temperature ignition performance and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of catalyst research and preparation, in particular to the technical field of research and preparation of motor vehicle tail gas treatment catalysts, and particularly relates to an oxidation-type catalytic system with good low-temperature light-off performance and a preparation process thereof. Background technique [0002] The diesel engine has high thermal efficiency, good economy, long service life and CO 2 Low emissions and other significant advantages, therefore, the degree of dieselization of motor vehicles continues to increase, and the market share in Europe is as high as 80%. In my country, the trend of dieselization is also becoming more and more obvious, but the fuel (diesel) used by diesel vehicles The large amount of toxic tail gas emitted, especially nitrogen oxides (NOx), has caused serious harm to human health. [0003] In recent years, with the continuous development of the automobile indust...

Claims

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Application Information

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IPC IPC(8): B01J29/74B01J29/44B01J37/02B01J37/08B01D53/94
CPCB01D53/945B01J29/44B01J29/7415B01J37/0234B01J37/08
Inventor 魏宽王云王瑞芳程康李云陈启章冯锡吴干学张艳华
Owner SINOCAT ENVIRONMENTAL TECH
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