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Preparation method of catalyst with high CO purification performance and catalyst thereof

A purification performance and catalyst technology, which is applied to the preparation method of high CO purification performance catalysts and the field of catalysts, which can solve the problems of unfavorable scale-up production and complicated process

Pending Publication Date: 2022-07-29
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of ultrasonic dispersion and plasma discharge treatment in this application is relatively complicated, which is not conducive to industrial scale-up production

Method used

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  • Preparation method of catalyst with high CO purification performance and catalyst thereof
  • Preparation method of catalyst with high CO purification performance and catalyst thereof
  • Preparation method of catalyst with high CO purification performance and catalyst thereof

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preparation example Construction

[0037] The preparation method of the high CO purification performance catalyst of the present invention comprises the following steps:

[0038] 1. Loading of precious metals: first weigh a certain amount of precious metal solution, such as Pt, Pd, Rh or / and Ru, at least one of Ru and Pt, Pd, Rh; CeO modified according to the carrier material rare earth 2 -ZrO 2 Or / and the water pore volume of the high temperature resistant material to adjust the water consumption of the precious metal solution, the precious metal is supported on the above-mentioned carrier material by the equal volume impregnation method, and the obtained powder is dried at 50-90 ° C after fully stirring and mixing.

[0039] 2. Roasting precious metal powder: The Pt, Pd, Rh precious metal powder prepared in step 1 is calcined at a constant temperature of 500°C for 1h, and the Ru powder roasting control condition is calcining at 600-900°C for 1-4h in air.

[0040] 3. Sizing: add the powder prepared in step 2 i...

Embodiment 1

[0044] 1. The metal carrier is used, and the specification of the metal carrier is: the number of holes is 300cell / in 2 , the wall thickness is 1.5mm, and the size is Φ45mm (diameter) * 120 (shell length) * 101.6 (inner core length). The carrier was calcined at 950°C for 4h to make Al covered 2 O 3 crystal carrier. The carrier is immersed in the silica adhesive, the excess slurry is blown out with air, and dried with air at 150°C to form a transition layer on the surface of the carrier.

[0045] 2. Precious metal loading: Weigh a certain amount of precious metal Pt solution and load it on CeO by equal volume dipping method. 2 -ZrO 2 -La 2 O 3 (where CeO 2 content of 40%); the precious metal Rh was supported on La-Al by the same method. 2 O 3 , CeO 2 -ZrO 2 -Y 2 O 3 (where CeO 2 content is 20%); the precious metal Ru is supported on CeO by the same method 2 -ZrO 2 -Y 2 O 3 (where CeO 2 The content is 20%); after fully stirring and mixing, the obtained powder ...

Embodiment 2

[0053] 1. The metal carrier is used, and the specification of the metal carrier is: the number of holes is 300cell / in 2 , the wall thickness is 1.5mm, and the size is Φ45mm (diameter) * 120 (shell length) * 101.6 (inner core length). The carrier was calcined at 950°C for 4h to make Al covered 2 O 3 crystal carrier. The carrier is immersed in the silica adhesive, the excess slurry is blown out with air, and dried with air at 150°C to form a transition layer on the surface of the carrier.

[0054] 2. Precious metal loading: Weigh a certain amount of precious metal Pt solution and load it on CeO by equal volume dipping method. 2 -ZrO 2 -La 2 O 3 (where CeO 2 content of 40%); the precious metal Rh was supported on La-Al by the same method. 2 O 3 , CeO 2 -ZrO 2 -Y 2 O 3 (where CeO 2 content is 20%); the precious metal Ru is supported on CeO by the same method 2 -ZrO 2 -Y 2 O 3 (where CeO 2 The content is 20%); after fully stirring and mixing, the obtained powder ...

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Abstract

The invention discloses a preparation method of a catalyst with high CO purification performance and the catalyst. The catalyst is used for being coated on the surface of a carrier to prepare an engine tail gas purification catalyst and is prepared by loading noble metal on a carrier material; the noble metal is Ru and one or more of Pt, Pd and Rh, the Ru content is 1g / ft < 3 >-30g / ft < 3 >, and the rest is 5g / ft < 3 >-40g / ft < 3 >; according to the catalyst, a loading material of Ru is adjusted, oxygen deficiency of a Ce-containing material is utilized, the synergistic effect of Ru and the material is increased, migration and sintering of Ru particles under the high-temperature condition are inhibited, and the anti-aging performance of Ru is improved; meanwhile, the roasting temperature of Ru powder is changed, a Ru precursor is firstly converted into Ru oxide, and strong interaction is generated between the Ru oxide and the carrier, so that Ru is in the optimal active valence state, the number of active centers of the whole catalyst coating is increased, and the CO performance and durability of the catalyst are improved; according to the invention, Ru with relatively low price is adopted to replace a part of Pt, Pd and Rh, so that the cost of the catalyst is reduced, and the cost performance of the catalyst is improved.

Description

technical field [0001] The invention belongs to the technical field of three-way catalyst preparation, and in particular relates to a preparation method of a catalyst with high CO purification performance and a catalyst thereof. Background technique [0002] Vehicle exhaust pollutants have become one of the main sources of urban pollution in China. The gas pollutants emitted by vehicles mainly include carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx). In order to effectively control the emission of gas pollutants from gasoline engines, the installation of catalytic purifiers is one of the most effective ways to prevent and control vehicle exhaust pollution. At present, the most commonly used catalytic purifier is the three-way catalyst. Under the condition of controlling the air-fuel ratio, it can simultaneously purify the toxic and harmful substances such as CO, NOx and HC in the exhaust gas. [0003] The three-way catalyst is mainly composed of a carrier, ...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01D53/94B01D53/62B01D53/72B01D53/56
CPCB01J23/63B01J23/002B01D53/945B01J2523/00B01D2257/502B01D2257/702B01D2257/404B01D2258/01B01J2523/31B01J2523/36B01J2523/3706B01J2523/3712B01J2523/41B01J2523/48
Inventor 杨怡王金凤张锋李大成孙创叶辉王星王云李云陈启章
Owner SINOCAT ENVIRONMENTAL TECH
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