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Pd/Ce0.8Zr0.2O2/cordierite honeycomb ceramic monolithic catalyst, preparation method and application thereof

A monolithic catalyst and cordierite honeycomb technology, applied in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., to achieve the effects of improving oxygen storage performance, improving palladium utilization, and uniform thermal stability

Inactive Publication Date: 2011-04-06
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Method of the present invention prepares Pd / Ce 0.8 Zr 0.2 o 2 / cordierite honeycomb ceramic monolithic catalyst, and applied to the catalytic combustion treatment of toluene, has not been reported yet

Method used

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  • Pd/Ce0.8Zr0.2O2/cordierite honeycomb ceramic monolithic catalyst, preparation method and application thereof
  • Pd/Ce0.8Zr0.2O2/cordierite honeycomb ceramic monolithic catalyst, preparation method and application thereof
  • Pd/Ce0.8Zr0.2O2/cordierite honeycomb ceramic monolithic catalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Surface pretreatment of honeycomb ceramics: set the hole density to 400 holes / inch 2 Boil cordierite honeycomb ceramics with a wall thickness of 0.1mm in 10wt% dilute hydrochloric acid solution for 30 minutes, take it out, rinse it with distilled water, and dry it at 120°C for 1 hour;

[0027] (2) Preparation of cerium-zirconium composites by impregnation method: configure 0.16moL / LCe(NO 3 ) 3 ·6H 2 O, 0.04moL / LZr(NO 3 ) 4 ·5H 2 A mixed solution of O and 0.24moL / L citric acid, stirred in a water bath at 40°C for 60min, then soak the honeycomb ceramic carrier treated in step (1) into the mixed solution for 3h, take out and blow off the remaining solution in the holes , air-dried naturally, dried at 120°C for 2h, calcined in a muffle furnace at 400°C for 1h, and repeated the above process twice to obtain Ce 0.8 Zr 0.2 o 2 / cordierite honeycomb ceramic carrier;

[0028] (3) Ce 0.8 Zr 0.2 o 2 Sensitization and activation treatment of cordierite honeycomb ce...

Embodiment 2

[0034] (1) honeycomb ceramic surface pretreatment: operate by the method in embodiment 1;

[0035] (2) Preparation of cerium-zirconium composite by impregnation method: operate according to the method in Example 1;

[0036] (3) Ce 0.8 Zr 0.2 o 2 Sensitization and activation treatment of cordierite honeycomb ceramic carrier: operate according to the method in Example 1;

[0037] (4) Preparation of electroless palladium plating solution: prepared according to the method in Example 1, PdCl 2 The concentration is 0.10g / L;

[0038] (5) electroless palladium plating: operate according to the method in embodiment 1, can obtain 0.12wt%Pd / Ce 0.8 Zr 0.2 o 2 / cordierite honeycomb ceramic monolithic catalyst;

[0039] (6) Catalytic combustion performance evaluation of monolithic catalyst: operate by the method in embodiment 1, evaluation result sees attached figure 2 .

Embodiment 3

[0041] (1) honeycomb ceramic surface pretreatment: operate by the method in embodiment 1;

[0042] (2) Preparation of cerium-zirconium composite by impregnation method: operate according to the method in Example 1;

[0043] (3) Ce 0.8 Zr 0.2 o 2 Sensitization and activation treatment of cordierite honeycomb ceramic carrier: operate according to the method in Example 1;

[0044] (4) Preparation of electroless palladium plating solution: prepared according to the method in Example 1, PdCl 2 The concentration is 0.20g / L;

[0045] (5) electroless palladium plating: operate according to the method in embodiment 1, can obtain 0.24wt%Pd / Ce 0.8 Zr 0.2 o 2 / cordierite honeycomb ceramic monolithic catalyst;

[0046] (6) Catalytic combustion performance evaluation of monolithic catalyst: operate by the method in embodiment 1, evaluation result sees attached figure 2 .

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Abstract

The invention discloses a Pd / Ce0.8Zr0.2O2 / cordierite honeycomb ceramic monolithic catalyst, a preparation method and application thereof. The catalyst is prepared by taking cordierite honeycomb ceramic which is eroded by hydrochloric acid as a first carrier, a cerium-zirconium composite oxide as a second carrier, and a precious metal, namely palladium (Pd) as an active ingredient; preparing a cerium-zirconium composite coating on the cordierite carrier by an immersion method; immersing the carrier into plating solution; and directly reducing palladium onto the cordierite honeycomb ceramic coated with the cerium-zirconium composite coating by the redox reaction of palladium chloride and sodium hypophosphite and the self-catalysis of the palladium. The preparation method improves the oxygen storage performance of the catalyst, improves high-temperature resistance, and realizes uniform load of nano-palladium particles on the carriers without embedding active sites; moreover, the using amount of the palladium is small, the utilization rate of the palladium is improved, the process is simple, the preparation period is short, and the production cost is low. The monolithic catalyst prepared by the method has high activity and high stability; and the methylbenzene can be oxidized into harmless carbon dioxide (CO2) and water (H2O) in the presence of the catalyst at the temperature of 220 to 300 DEG C.

Description

technical field [0001] The invention relates to a noble metal Pd / Ce 0.8 Zr 0.2 o 2 A cordierite honeycomb ceramic monolithic catalyst and a preparation method thereof, the catalyst is used for catalytic combustion treatment of toluene. Background technique [0002] Nowadays, benzene, toluene, xylene, ethyl acetate, Acetone, methanol, formaldehyde and other waste gases containing volatile organic compounds (VOCs) (Volatile Organic Compounds). Most of these harmful gases are flammable and explosive, and their massive discharge not only has a serious impact on the local ecological environment but also on the earth's environment. It is one of the causes of atmospheric photochemical smog, greenhouse effect and ozone layer destruction. At the same time, volatile organic waste gas is a pollutant that is harmful to human health. It is often distributed in the air along with peculiar smell and stench. Harmful effects, even acute and chronic poisoning, carcinogenic and mutagenic....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J35/04B01D53/72B01D53/86
Inventor 余倩林探厅余林李永峰李俊刁贵强孙明
Owner GUANGDONG UNIV OF TECH
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