Composite catalyst used for catalytic combustion of organic waste gas as well as preparation method and application thereof

A composite catalyst and catalytic combustion technology are applied in the fields of cordierite honeycomb ceramic catalysts and composite organic waste gas catalytic combustion catalysts, which can solve the problems of decreased catalytic activity, high catalyst cost, difficult adsorption, etc., so as to increase the surface area of ​​the coating and reduce the production cost. , to ensure the effect of sufficient adsorption

Active Publication Date: 2011-11-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation process of the existing organic waste gas catalytic combustion catalyst generally uses alumina as the transition coating, which has the disadvantages of poor bonding between the coating and the cordierite carrier, low specific surface area, and difficult adsorption of active components.
The loading of active components generally adopts thermal adsorption method or impregnation method. Due to insufficient adsorption, the utilization rate of precious metals is low. The impregnation method tends to make the active components unevenly distributed on the surface of the catalyst, resulting in a decrease in catalytic activity.
Catalysts that only use noble metals as active components have high cost and poor anti-poisoning ability
Catalysts with only non-noble metals as active components have high light-off temperatures and short lifetimes

Method used

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  • Composite catalyst used for catalytic combustion of organic waste gas as well as preparation method and application thereof
  • Composite catalyst used for catalytic combustion of organic waste gas as well as preparation method and application thereof
  • Composite catalyst used for catalytic combustion of organic waste gas as well as preparation method and application thereof

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Embodiment 1

[0031] Cordierite honeycomb ceramics (200cell / in 2 ), put it into 1% dilute nitric acid solution, carry out acid etching pretreatment for 1h, wash it with water, and dry it in a blast drying oven at 120°C for 2h. Macropores and high-viscosity pseudo-boehmite were mixed in a mass ratio of 1:3 (total mass 30 grams), and a mixture of 3 g of cerium nitrate and zirconium nitrate (molar ratio of 3: 1) was added, dissolved in 90 ml of deionized water, After fully stirring, use 1mol·L -1 The pH value of the dilute nitric acid preparation solution is 2, and the transition coating solution after hydrolysis is continuously stirred for 2 hours. Immerse the pretreated cordierite carrier in the transition coating, take it out after impregnating saturation, blow off the excess solution in the channel with compressed air, then put it in an oven for 2 hours at 120°C, and bake it at 400°C for 4 hours to obtain a cordierite composite carrier. According to Cu, Mn, Zn, Fe mass ratio 3: 1: 1: 1,...

Embodiment 2

[0033] Cordierite honeycomb ceramics (200cell / in 2 ), put it into 1% dilute nitric acid solution, carry out acid etching pretreatment for 1h, wash it with water, and dry it in a blast drying oven at 120°C for 2h. Macropores and high-viscosity pseudo-boehmite are mixed in a mass ratio of 1: 1 (total mass 30 grams), and a mixture of 3 g of lanthanum nitrate and yttrium nitrate (molar ratio is 3: 1) is added, dissolved in 90 ml of deionized water, After fully stirring, use 1mol·L -1The pH value of the diluted nitric acid preparation solution was 2, and the hydrolyzed gel was stirred for 2 hours. Immerse the treated cordierite carrier in the transition coating, take it out after impregnation saturation, blow off the excess solution in the channel with compressed air, then put it in an oven at 120°C, dry it for 2 hours, and bake it at 400°C for 4 hours to obtain a cordierite composite carrier. Dissolve the nitrates of Cu, Mn, Zn, and Fe four non-precious metal elements in a mass...

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Abstract

The invention discloses a composite catalyst used for catalytic combustion of organic waste gas as well as a preparation method and an application thereof, belonging to the technical field of catalysts. The composite catalyst is a Pt-Pd / Cu-Mn-Zn-Fe / transition layer / cordierite catalyst, macroporous high-sticky composite pseudo boehmite is taken as a second carrier, namely transition rubber, any two of La, Y, Ce and Zr are selected as assistants, non-precious metals such as Cu, Mn, Zn and Fe and precious metals Pd and Pt are taken as active components, wherein the second carrier and the assistants form the transition layer. The preparation method comprises the following steps of: carrying out acid treatment on the cordierite honeycomb ceramic surface and loading the transition layer, then loading the non-precious metal elements Cu, Mn, Zn and Fe by adopting an immersion method, and then sequentially loading the precious metals Pd and Pt by adopting a precipitation-thermal adsorption coupling method. By adopting the invention, sulphur poisoning of the catalyst can be prevented, the life of the catalyst can be prolonged, and the production cost of the catalyst can be reduced.

Description

technical field [0001] The invention relates to a composite organic waste gas catalytic combustion catalyst, in particular to a cordierite honeycomb ceramic catalyst for catalytic combustion of organic waste gas with high activity, resistance to sulfur poisoning, low cost and long service life, belonging to the technical field of catalysts. Background technique [0002] Organic waste gases (VOCs) are produced in various industrial production processes. How to use as few resources as possible to effectively treat waste gases and reduce the generation of pollutants has become a hot spot of concern. Catalytic combustion technology reduces pollutant emissions and has the advantages of low ignition temperature, low energy consumption and stable combustion. Therefore, catalytic combustion catalysts have attracted widespread attention in organic waste gas treatment, energy recovery and power generation. [0003] The existing preparation process of organic waste gas catalytic combus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01D53/86B01D53/72
Inventor 朱吉钦宋春雨郭金刚王志杰刘新斌郭翔
Owner BEIJING UNIV OF CHEM TECH
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