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Supported VOCs catalytic combustion catalyst and preparation method thereof

A catalytic combustion and catalyst technology, applied in combustion methods, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of coating peeling, complex preparation process, low specific surface of coating, etc. The effect of cracking, easy to obtain raw materials, and simple preparation process

Active Publication Date: 2018-01-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, a four-component catalyst introduced in the invention book of patent CN1462648B has mild operating conditions and low cost. Compared with the non-noble metal catalysts in the prior art, the reaction temperature is greatly reduced and the activity is improved, but the preparation process is complicated and not suitable for expansion. Production
Patent CN101015806A discloses a wire mesh type catalytic combustion catalyst and its preparation and application. The catalyst has high mechanical energy and high activity, but the active components generally have uneven distribution and are easy to fall off
Patent CN101439290A discloses a honeycomb ceramic type perovskite catalytic combustion catalyst and its preparation and application. The catalyst coating slurry has complex components, and the coating has a low specific surface area. It needs multiple coatings, which is easy to cause the coating to fall off.

Method used

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  • Supported VOCs catalytic combustion catalyst and preparation method thereof
  • Supported VOCs catalytic combustion catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] A preparation method of supported VOCs catalytic combustion catalyst, the steps are as follows:

[0030] (1) Carrier pretreatment

[0031] Take a cordierite honeycomb ceramic carrier, immerse it in a 5wt% nitric acid solution, heat it to boiling, take it out after heat treatment for 4 hours, wash it with water under the assistance of ultrasonic waves until the solution becomes neutral, dry it at 100°C, and roast it at 550°C for 1 hour, and set aside.

[0032] (2) Preparation of catalyst coating

[0033] Preparation of ternary solid solution Ce with three-dimensional porous honeycomb framework structure by complex impregnation method 0.8 -Zr 0.1 -Ti 0.1 o 2 . Prepare a mixed solution of 0.56moL / L cerium nitrate, 0.07moL / L zirconium nitrate, 0.07moL / L titanium sulfate and 0.14moL / L citric acid, cook in a water bath to make it appear as a sol, and then place the cordierite carrier in the sol , took it out to dry, dried at 100°C, and roasted at 650°C for 2 hours to pr...

Embodiment 2

[0039] A preparation method of supported VOCs catalytic combustion catalyst, the steps are as follows:

[0040] (1) Carrier pretreatment

[0041] Take the cordierite honeycomb ceramic carrier, immerse it in 20wt% nitric acid solution, heat it to boiling, take it out after heat treatment for 1h, wash it with water under the assistance of ultrasonic waves until the solution becomes neutral, dry it at 80°C, and bake it at 550°C for 1h, and set aside.

[0042] (2) Preparation of catalyst coating

[0043] Preparation of ternary solid solution Ce with three-dimensional porous honeycomb framework structure by complex impregnation method 0.5 -Zr 0.4 -Ti 0.1 o 2 . Prepare a mixed solution of 0.35moL / L cerium acetate, 0.28moL / L zirconium nitrate, 0.07moL / L titanium sulfate and 0.07moL / L glycine, cook in a water bath to make it appear as a sol, and then place the cordierite carrier in the sol , take it out to dry in the air, dry at 80°C, and bake at 400°C for 6h to prepare Ce with ...

Embodiment 3

[0047] A preparation method of supported VOCs catalytic combustion catalyst, the steps are as follows:

[0048] (1) Carrier pretreatment

[0049] Take the cordierite honeycomb ceramic carrier, immerse it in 10wt% nitric acid solution, heat it to boiling, take it out after heat treatment for 2 hours, wash it with water under the assistance of ultrasonic waves until the solution becomes neutral, dry it at 100°C, bake it at 400°C for 1 hour, and set it aside.

[0050] (2) Preparation of catalyst coating

[0051] Preparation of ternary solid solution Ce with three-dimensional porous honeycomb framework structure by complex impregnation method 0.1 -Zr 0.8 -Ti 0.1 o 2 . Prepare a mixed solution of 0.14moL / L cerium nitrate, 1.12moL / L zirconium acetate, 0.14moL / L titanium sulfate and 0.28moL / L acrylamide, cook it in a water bath to make it appear as a sol, and then place the cordierite carrier in the sol , take it out to dry in the air, dry at 120°C, and bake at 500°C for 4 hour...

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Abstract

The invention relates to a supported VOCs catalytic combustion catalyst and a preparation method thereof. According to the catalyst, cordierite ceramic is taken as a carrier, a ternary solid solutionCex-Zry-Ti(1-x-y)-O2 with a three-dimensional porous cellular skeleton structure is taken as a coating layer, and a composite oxide formed by Co and Ce is taken as a catalytic active component. The preparation method comprises the following steps: firstly, coating a pretreated carrier with the ternary solid solution with the three-dimensional porous cellular skeleton structure by virtue of a complexing dipping method; and secondly, preparing a cobalt-cerium composite oxide by virtue of an in-situ spontaneous combustion synthesis method, dipping the carrier into a precursor solution, forming astable cage-shaped structure by virtue of combination of lone pair electrons of an organic template agent and vacant orbits of metal ions, and synthesizing a precursor of the active components on thesurface in situ. The active components of the catalyst are uniformly dispersed, high-strength combination is realized between the carrier and the coating layer as well as the active components and thecoating layer, so that the supported VOCs catalytic combustion catalyst has the characteristics of low initiation temperature, high conversion efficiency, good high temperature resistance, low cost and the like and can be widely applied to the VOCs purification treatment.

Description

technical field [0001] The invention belongs to the technical fields of air pollution control technology and environmental protection catalytic materials, and in particular relates to a supported VOCs catalytic combustion catalyst and a preparation method thereof. Background technique [0002] Volatile organic waste gases (VOCs) are one of the main causes of smog, atmospheric photochemical smog, greenhouse effect and ozone layer destruction. They mainly come from petrochemical, fine chemical, textile printing and dyeing, spraying, packaging printing, pharmaceutical and pesticide manufacturing, Waste gas emitted during the production process of electronics and other industries has brought great harm to the ecological environment and human health. According to incomplete statistics, the annual emissions of industrial VOCs in my country was about 12 million tons in 2010, and it is estimated that by 2020, the annual emissions of industrial VOCs in my country will reach 25 millio...

Claims

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Application Information

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IPC IPC(8): B01J23/83F23G7/07
CPCB01J23/83F23G7/07
Inventor 李俊华李兵彭悦陈建军刘帅
Owner TSINGHUA UNIV