Method for preparing rhodium-containing catalyst and catalyst prepared according to method

A rhodium catalyst and rhodium-catalyzed technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as insignificant improvement effects, achieve improved light-off performance, improved durability, and improved utilization Effect

Active Publication Date: 2017-08-18
SINOCAT ENVIRONMENTAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] In the examples in the US20090257933 article, it is mentioned that the rhodium nitrate and the catalytic material are planetary mixed to form a slurry, and then added in an alkaline solution of monoethanolamine (MEA) 3 times the mass of Rh, and mixed for 10 minutes, in the whole slurry embodiment , the amount of monoethanolamine is small, it cannot fully interact with the precious metal rhodium, and the improvement effect is not obvious

Method used

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  • Method for preparing rhodium-containing catalyst and catalyst prepared according to method
  • Method for preparing rhodium-containing catalyst and catalyst prepared according to method
  • Method for preparing rhodium-containing catalyst and catalyst prepared according to method

Examples

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Embodiment 1

[0043] 1. Add 2.5g of rhodium solution to a glass, place it in a water bath at 40°C, and concentrate it under continuous stirring. The concentration of rhodium after concentration is 45%, and add 0.42g of glycerin (50% concentration) under continuous stirring , the addition of glycerol is 1 times of rhodium molar weight, after constant temperature 0.5h, measure rhodium solution viscosity at 8.5Pa.s, add monoethanolamine solution in the solution and adjust the pH of rhodium solution, make pH be 5.0, continue to stir After 20min, take out the rhodium solution and divide it into two parts evenly, one of which is added to the oxygen storage material 49.88gCe 20 Zr 70 Y 5 La 5 Among them, another part is added to the modified alumina material 49.88g La 20 Al 80 In the process, after the precious metal and the catalytic material are mixed evenly, they are dried at 80°C for 2h, and the dried powder is roasted at 500°C for 2h, and the precious metal rhodium powder A1 and B1 are ob...

Embodiment 2

[0047] Step 1 in Example 1 is adjusted as follows:

[0048] 1. Add 2.5g of rhodium solution to a glass, place it in a water bath at 40°C, and concentrate it under continuous stirring. The concentration of rhodium after concentration is 45%, and add 0.42g of glycerin (50% concentration) under continuous stirring , the addition of glycerol is 1 times of rhodium molar weight, after constant temperature 0.5h, measure the rhodium solution viscosity at 8.5Pa.s, add monoethanolamine solution in the solution to adjust the pH of rhodium solution, make pH be 3.5, continue to stir After 20min, take out the rhodium solution and divide it into two evenly, one of which is added to the oxygen storage material containing 49.88gCe 20 Zr 70 Y 5 La 5 , 2.5g aluminum sol, 2.5g dilute nitric acid and 76g water ball milling in the jar obtains the 40% solid content catalytic slurry J2-1 containing rhodium;

[0049] Another part is added to the material containing modified alumina 49.88g La 20 A...

Embodiment 3

[0051] Step 1 in Example 1 is adjusted as follows:

[0052] 1. Add 2.5g of rhodium solution to a glass, place it in a water bath at 80°C, and concentrate it under continuous stirring. The concentration of rhodium after concentration is 80%. Add 3.15g of glycerin (100% concentration) under continuous stirring , the addition of glycerol is 15 times of the molar weight of rhodium, and the rhodium solution viscosity is measured at 31Pa.s after constant temperature 0.5h, and monoethanolamine solution is added in the solution to adjust the pH of the rhodium solution, making the pH 3.5, and continuing to stir for 20min Finally, take out the rhodium solution and divide it equally into two parts, one of which is added to the oxygen storage material 49.88gCe 20 Zr 70 Y 5 La 5 Among them, another part is added to the modified alumina material 49.88g La 20 Al 80 In the process, after the precious metal and the catalytic material are mixed evenly, they are dried at 80°C for 2h, and th...

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Abstract

The invention discloses a high-performance rhodium-containing catalyst and a preparation method thereof. The catalyst disclosed by the invention is composed of a matrix and a catalyst coating, wherein the surface of the matrix is coated with the catalyst coating; the catalyst coating is composed of a catalytic material and precious metals; and the catalyst coating at least comprises a rhodium catalyst layer and can further comprise palladium, platinum or a catalyst layer formed by mixing platinum and palladium at a certain ratio. A method for preparing the rhodium catalyst layer comprises the following steps: concentrating a rhodium solution with the mass percentage concentration of 10% until the mass percentage concentration is 40-100% while continuous stirring at the temperature of 40-90 DEG C; adding alcohol, and reacting for 0.5-5 hours, wherein the solution viscosity is 5-50 Pa.s; and adding an alkanolamine solution, regulating the pH value to be 3.5-10.5, continuously stirring for 5-60 minutes, taking out the rhodium solution and adding into the catalytic material so as to form powder/slurry; coating the matrix with the powder or slurry, thereby obtaining the rhodium catalyst layer. The catalyst prepared according to the preparation method is used for treating motorcycle exhaust or gasoline car exhaust, and has the advantages of readily available raw materials, simple preparation process, low initiation temperature and excellent durability.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and relates to a preparation method of a high-performance rhodium-containing catalyst and the catalyst. Background technique [0002] With the popularization of social environmental protection awareness and the improvement of environmental protection requirements, the country continues to upgrade the emission standards for motor vehicles, and the requirements for the national IV emission limits and endurance mileage of motorcycles and gasoline engines continue to upgrade, which directly leads to the starting of catalytic converters. The requirements for combustion performance and durability are getting higher and higher, making continuous improvement of catalyst performance technology a direction that people in the same industry must work hard for. [0003] In the existing catalyst preparation technology, the method of supporting noble metals is to impregnate and support noble metal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/89B01D53/94B01D53/56B01D53/62B01D53/72
CPCB01D53/945B01D2258/01B01D2258/014B01J23/63B01J23/894
Inventor 王金凤李大成陈山虎张锋叶辉程永香王云杨怡李云陈启章袁万里
Owner SINOCAT ENVIRONMENTAL TECH
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