Oxidizing type catalyzing system with good low-temperature NO oxidizing ability and preparation method thereof

A technology of catalytic system and oxidizing ability, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems such as the decline of passive regeneration efficiency of CSF, and achieve the improvement of low-temperature NO oxidation performance, process safety and reliability. Control and coating uniform effect

Active Publication Date: 2018-09-28
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This catalyst is used in DOC+CSF+SCR after-treatment system of diesel vehicles, and NO is oxidized to NO 2 It is mainly controlled by CSF, and DOC plays a secondary role. The overall purpose is to provide an appropriate amount of NO for the downstream SCR reaction 2 , to participate in the Fast-SCR reaction, but for medium and heavy-duty diesel vehicles, passive regeneration occurs mainly. When passive regeneration occurs in CSF, a large amount of NO will be consumed 2 , to assist the catalytic oxidation of the soot trapped in the CSF, which still needs to be provided by the upstream catalytic unit DOC, so it relies on the NO produced by the CSF 2 The amount produced, there is a risk of reducing the efficiency of CSF passive regeneration

Method used

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  • Oxidizing type catalyzing system with good low-temperature NO oxidizing ability and preparation method thereof
  • Oxidizing type catalyzing system with good low-temperature NO oxidizing ability and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] To prepare an oxidation-type catalytic system with good low-temperature NO oxidation ability, comprising the following steps:

[0041] Pre-coating slurry configuration and coating

[0042] 1) Slurry configuration: Add pseudo-boehmite and acetic acid to deionized water in proportion, the weight ratio is 1:1:2, perform ball milling, and then add catalytic materials loaded with precious metals (Pt:Pd=1:1) Alumina-zirconia, beta molecular sieves are added to the binder. The amount of water added is calculated based on the solid content of 42wt%, pH: 4.2, high-energy ball milling for 20min, D 90 = 9.1 μm.

[0043] 2) Determination 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 detect and calculate the solid content to be 37.9 wt%.

[0044] 3) Coating application: the ratio of the front and back stage areas is 1:1, and the lower grouting coating is carried out according to the loading a...

Embodiment 2

[0054] To prepare an oxidation-type catalytic system with good low-temperature NO oxidation ability, comprising the following steps:

[0055] Pre-coating slurry configuration and coating

[0056] 1) Slurry configuration: Add pseudo-boehmite and acetic acid to deionized water in proportion, with a weight ratio of 1:1:2, perform ball milling, and then add catalytic materials loaded with precious metals (Pt:Pd=5:1) Alumina-silica, cerium-doped beta molecular sieves are added to the binder. The amount of water added is calculated based on the solid content of 39wt%, pH: 3.4, high-energy ball milling for 20min, D 90 =8.4 μm, viscosity: 176 Pa.s.

[0057] 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 detect and calculate the solid content to be 39.5 wt%.

[0058] 3) Coating application: the ratio of the front and back stage areas is 1:2, and the lower grouting coating is carrie...

Embodiment 3

[0068] To prepare an oxidation-type catalytic system with good low-temperature NO oxidation ability, comprising the following steps:

[0069] Pre-coating slurry configuration and coating

[0070] 1) Slurry configuration: Add pseudo-boehmite and acetic acid to deionized water in proportion, with a weight ratio of 1:1:2, perform ball milling, and then add catalytic materials loaded with precious metals (Pt:Pd=7:1) Alumina-lanthanum oxide, ZSM-5 molecular sieves are added to the binder. The amount of water added is calculated based on the solid content of 37wt%, pH: 5.2, high-energy ball milling for 20min, D 90 =10 μm, viscosity: 175 Pa.s.

[0071] 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. Finally, the calculated solid content is 36.8 wt%.

[0072] 3) Coating application: the ratio of the front and rear stage areas is 1:4, and the lower grouting coating is carried out ac...

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Abstract

The invention discloses an oxidizing type catalyst. The oxidizing type catalyst is used for purifying tail gas of heavy disease vehicles, and has high NO (nitric oxide) oxidizing ability in the cold start phase at low temperature, namely that NO is oxidized and converted into NO2 (nitrogen dioxide), so as to provide NO2 for the catalyzing reaction of downstream catalyzing units, such as DPF (diesel particulate filter) and SCR (selective catalytic reducer); finally, the NOx (oxynitride) is converted into N2 (nitrogen), so as to purify the NOx. A catalyst coating layer is coated by sections, andis mainly used for improving the ability of converting NO into NO2 at low temperature section, and accelerating the temperature for converting NO into NO2 to move towards the low temperature direction; a carrier material consists of cerium oxide and composite oxide thereof, and the coating is coated by sections, and is of a single-layer structure; the active components contain noble metals (Pt (platinum) and Pd (palladium)), and the total content is controlled within 5 to 15 g/ft3. The oxidizing type catalyst has the advantages that the preparation technology is simple, the cost is low, the property is stable, the good ability of converting NO into NO2 at low temperature is realized, and the oxidizing type catalyst is suitable for industrialized 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, in particular to an oxidation-type catalytic system with good low-temperature NO oxidation ability and a preparation method thereof. Background technique [0002] The diesel engine has the obvious advantages of high thermal efficiency and good economy. Under the condition of lean combustion, it will produce a large amount of NOx. NOx mainly includes NO and NO 2 , causing serious harm to human health; with the continuous development of the automobile industry, the number of various types of motor vehicles has increased sharply, which has also led to serious air pollution. Therefore, hydrocarbons (HC) and carbon monoxide (CO) in diesel engine exhaust ) and the catalytic purification of a large amount of nitrogen oxides (NOx) has attracted worldwide attention. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/74B01J29/44B01J37/02B01D53/94B01D53/56B01D53/62B01D53/72
CPCB01D53/945B01J29/44B01J29/7415B01J37/0228B01J2229/18
Inventor 魏宽王瑞芳王云龚国恒程康李云陈启章吴干学冯锡张艳华
Owner SINOCAT ENVIRONMENTAL TECH
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