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Preparation method and application of mesoporous alumina supported palladium-based catalyst

A technology of mesoporous alumina and catalyst, applied in mechanical equipment, engine components, machines/engines, etc., can solve the problem of inability to form stable alumina tetrahedral structural units, poor thermal stability of mesoporous alumina materials, and toxic aluminum alkoxides Cost and other issues, to achieve good processing capacity, reduce product raw material costs, and reduce production costs

Inactive Publication Date: 2017-05-31
昆明贵研催化剂有限责任公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the catalysts supported by mesoporous alumina mainly have the following problems: (1) The synthesis of mesoporous alumina uses aluminum alkoxide as the aluminum source, but aluminum alkoxide is easily hydrolyzed in the aqueous phase. An organic solvent is added to the system to control its hydrolysis rate, and organic solvents are generally toxic and the cost of aluminum alkoxide is relatively high, and the synthesis conditions are also very complicated; (2) due to the formation of trivalent metal ions by aluminum elements, stable aluminum oxide cannot be formed. Tetrahedral structure unit, the synthesized mesoporous alumina material has poor thermal stability, and the pore structure is easy to collapse after the template agent is removed.

Method used

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  • Preparation method and application of mesoporous alumina supported palladium-based catalyst
  • Preparation method and application of mesoporous alumina supported palladium-based catalyst
  • Preparation method and application of mesoporous alumina supported palladium-based catalyst

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Embodiment 1

[0020] (1) weigh 10g of pseudo-boehmite (industrial grade, water loss rate of 15%), and dissolve it in 150mL of deionized water to obtain solution A;

[0021] (2) After stirring the solution A for 30min, dilute nitric acid was added to it to adjust the pH of the solution to 3 to obtain solution B;

[0022] (3) Add 5 g of polyethylene glycol to solution B, stir for 180 min, dry at a constant temperature at 100°C for 10 hours, and dry at a constant temperature at 600°C for 2 hours to obtain mesoporous alumina C;

[0023] (4) Weigh 5g of mesoporous alumina C dissolved in 0.625ml of Pd(NO 3 ) 2 solution, stirred for 30 minutes, dried at a constant temperature of 100°C for 12 hours, and at a constant temperature of 400°C for 2 hours to obtain a solid powder D. The powder solid D is the catalyst, denoted as Pd / Al 2 o 3 -1. The specific surface area of ​​this catalyst still has 240m2 measured by BET adsorption instrument. 2 / g, the pore volume is 0.42cc / g, and the pore diameter ...

Embodiment 2

[0028] (1) weigh 10g of pseudo-boehmite (industrial grade, water loss rate of 15%), and dissolve it in 150mL of deionized water to obtain solution A;

[0029] (2) After stirring the solution A for 30min, dilute nitric acid was added to it to adjust the pH of the solution to 3 to obtain solution B;

[0030] (3) Add 5 g of polyethylene glycol to solution B, stir for 180 min, dry at a constant temperature at 100°C for 10 hours, and dry at a constant temperature at 600°C for 4 hours to obtain mesoporous alumina C;

[0031] (4) Weigh 5g of mesoporous alumina C dissolved in 0.625ml of Pd(NO 3 ) 2 solution, stirred for 30 minutes, dried at a constant temperature of 100°C for 24 hours, and at a constant temperature of 600°C for 4 hours to obtain a solid powder D, which is the catalyst, denoted as Pd / Al 2 o 3-2. The specific surface area of ​​this catalyst still has 201m2 measured by BET adsorption instrument. 2 / g, the pore volume is 0.39cc / g, and the pore diameter is 5.9nm.

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Abstract

The invention discloses a preparation method and an application of a mesoporous alumina supported palladium-based catalyst and belongs to the technical field of catalytic materials. The method comprises steps as follows: firstly, pseudo-boehmite is taken as an aluminum source, a surfactant PEG (polyethylene glycol) is taken as a template agent, the aluminum source and the template agent are dried and calcined at high temperature, and a mesoporous alumina supporter is obtained; secondly, palladium nitrate (Pd(NO3)2) is taken as an active component precursor and is supported on the mesoporous alumina supporter with an impregnation method; finally, the catalyst is obtained through drying and calcination. The mesoporous material prepared with a surfactant template method has the characteristics of large specific surface area, adjustable pore parameters and the like, the catalyst with large specific surface area, high catalytic active component dispersity, high catalytic activity and good anti-aging performance can be prepared from the cheap pseudo-boehmite with simple impregnating, drying and calcining processes, and the method has great significance in the fields of catalytic materials and environmental protection technologies.

Description

technical field [0001] The invention discloses a method for preparing a mesoporous alumina-loaded palladium-based catalyst and its application, belonging to the technical fields of catalytic materials and environmental protection. It is widely used in the control of engine emission pollutants, especially for the use of gas (such as methane CH 4 Etc.) Motor vehicle emission effect is better. Background technique [0002] Exhaust emissions from natural gas vehicles are mainly methane (CH 4 ) mainly. According to the second assessment report of the Intergovernmental Panel on Climate Change (IPCC), the unit volume of CH 4 The warming potential of carbon dioxide (CO 2 ) 21 times. Therefore, how to efficiently eliminate CH 4 Become the main problem of natural gas vehicle exhaust gas after-treatment catalyst. Due to CH 4 Stable performance is difficult to activate or oxidize, and the temperature required for its catalytic combustion is high. In addition, a large amount of w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44F01N3/28
CPCB01J23/44F01N3/2807
Inventor 王浩浩赵云昆吴乐刚杨佳张家华肖慧
Owner 昆明贵研催化剂有限责任公司
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