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Preparation method of Cr-Ce composite oxide catalyst

A composite oxide and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of catalyst deactivation, secondary pollution, active components problems such as loss, to achieve the effects of high selectivity, low catalyst cost, and simple preparation process

Inactive Publication Date: 2012-04-18
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the catalytic oxidation of chlorinated hydrocarbons, the breaking of the C-Cl bond replaces the breaking of the C-H bond. Although it is more favorable to analyze the breaking of the C-Cl bond from a thermodynamic point of view, the generated Cl species will be strongly adsorbed on the surface of the catalyst or interact with the active group. Decomposition and synthesis to form volatile metal chlorides leading to loss of active components
On the one hand, it is more likely to lead to catalyst deactivation, on the other hand, the generated Cl 2 Can react with hydrocarbons to generate polychlorinated hydrocarbons, causing secondary pollution

Method used

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  • Preparation method of Cr-Ce composite oxide catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve 20.87g of cerium nitrate and 3.81g of chromium nitrate in 350ml of water, mix well, add ammonia water dropwise to pH 9.5, continue to stir for 0.5 hours, and then stand for 12 hours for aging; the filtered precipitate is filtered and washed with distilled water. After washing several times with absolute ethanol, supercritical drying treatment is adopted; after calcination in air atmosphere at 500℃ for 4 hours, a Cr-Ce composite oxide catalyst is prepared. The molar ratio of Ce / Cr in the catalyst is 4:1 .

Embodiment 2

[0020] Using the same operation as in Example 1, the difference is: the filtered precipitate was washed with distilled water for several times, then washed with absolute ethanol for several times, and then dried in an oven (110°C).

Embodiment 3

[0022] The same operation as in Example 1 was used, except that the filtered precipitate was washed with distilled water for several times, and then dried in an oven (110°C).

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Abstract

The invention provides a preparation method of a Cr-Ce composite oxide catalyst. The preparation method of the Cr-Ce composite oxide catalyst is characterized in that chromium nitrate and cerium nitrate as raw materials are prepared into the Cr-Ce composite oxide catalyst through a coprecipitation technology, wherein a mole ratio of Ce to Cr in the Cr-Ce composite oxide catalyst is in a range of (9: 1) to (1: 8). The preparation method of the Cr-Ce composite oxide catalyst is easy and has a low cost. The Cr-Ce composite oxide catalyst obtained by the preparation method has good chlorine-containing organic compound catalytic degradation activity and stability, high selectivity of CO2 and HCl, and no by-product such as polychlorocarbon and the like.

Description

technical field [0001] The invention relates to a preparation method of a chlorine-containing organic waste gas combustion catalyst, in particular to a preparation method of a Cr-Ce composite oxide catalyst. [0002] Background technique [0003] Halogen-containing VOCs are a class of pollutants that are particularly harmful to the atmospheric environment, especially chlorine-containing VOCs (CVOCs), which can not only destroy the ozone layer of the atmosphere, but also cause lasting and cumulative effects on human health and the ecological environment. For the removal of CVOCs, the method of thermal combustion is currently used for post-treatment. Compared with heat treatment, catalytic combustion is one of the most important and effective methods for purifying VOCs pollutants due to its technical and economic advantages. Similarly, the application in eliminating CVOCs has attracted more and more attention. During the catalytic oxidation of chlorinated hydrocarbons, the b...

Claims

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Application Information

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IPC IPC(8): B01J23/26B01D53/86B01D53/70
Inventor 周仁贤孟中华
Owner ZHEJIANG UNIV
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