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Catalyst applied to low temperature catalytic combustion of chlorination aromatic hydrocarbon as well as preparation method and application thereof

A technology of chlorinated aromatic hydrocarbons and low-temperature catalysis, applied in combustion methods, physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, etc., to achieve inhibition of polychlorination reactions, low price, and resistance to chlorine poisoning powerful effect

Inactive Publication Date: 2017-08-01
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the catalytic combustion of chlorinated hydrocarbons, Co 3 o 4 It is also a very good catalyst for chlorination reaction. During the catalytic combustion process, a large number of polychlorinated by-products will be produced

Method used

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  • Catalyst applied to low temperature catalytic combustion of chlorination aromatic hydrocarbon as well as preparation method and application thereof
  • Catalyst applied to low temperature catalytic combustion of chlorination aromatic hydrocarbon as well as preparation method and application thereof
  • Catalyst applied to low temperature catalytic combustion of chlorination aromatic hydrocarbon as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～12

[0028] Embodiment 1~12 sol-gel method prepares the tricobalt tetroxide catalyst modified by alkaline earth metal

[0029] Dissolve cobalt nitrate hexahydrate and alkaline earth metal precursor in the amount shown in Table 1 in 25 mL of deionized water, then add 6.3 g of citric acid monohydrate, and stir at room temperature for 30 min; then transfer the above solution to a water bath at 80°C for stirring 3 to 4 hours until the solution turns into a gel or viscous substance, then oven-dried at 110°C for 12 hours, and finally taken out and ground into powder, and then transferred to a muffle furnace for roasting. The calcination process is as follows: start heating at room temperature, program the temperature at a rate of 1°C / min to 500°C, and keep at 500°C for 4 hours to obtain an alkaline earth metal-modified tricobalt tetroxide catalyst.

Embodiment 1、5 and 9

[0030] Embodiment 1, 5 and 9 obtain the barium-modified tricobalt tetroxide catalyst;

Embodiment 2、6 and 10

[0031] Embodiment 2, 6 and 10 obtain the tricobalt tetroxide catalyst modified by strontium;

[0032] Embodiment 3, 7 and 11 obtain the calcium-modified tricobalt tetroxide catalyst;

[0033] Examples 4, 8 and 12 obtained the magnesium-modified tricobalt tetroxide catalyst.

[0034] Table 1 The alkaline earth metal precursors and their dosages of Examples 1 to 24

[0035]

[0036] Each alkaline earth metal precursor in Table 1, cobalt nitrate hexahydrate, and citric acid monohydrate are commercially available.

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Abstract

The invention discloses a catalyst applied to the low temperature catalytic combustion of chlorination aromatic hydrocarbon, and the catalyst refers to alkaline-earth metal modified cobalt oxide, wherein the alkaline-earth metal is magnesium, calcium, strontium or barium, and the molar ratio of cobalt to the alkaline-earth metal is (19 to 1) to (1 to 1). The invention further discloses a preparation method of the catalyst and application of the catalyst in the low temperature catalytic combustion of the chlorination aromatic hydrocarbon. The alkaline-earth metal modified cobalt oxide catalyst provided by the invention has the advantages of simple preparation technology, low price, high catalytic activity, high chlorine poisoning resistance, long service life and the like, and can be used for effectively suppressing chlorination. Under the condition of lower reaction temperature, the catalyst can be used for stably converting the chlorination aromatic hydrocarbon in waste gas into carbon dioxide, chlorine and hydrogen chloride through catalytic combustion for a long time.

Description

technical field [0001] The invention belongs to the technical field of catalytic combustion of organic compounds, and in particular relates to a catalyst for low-temperature catalytic combustion of chlorinated aromatic hydrocarbons, a preparation method thereof and an application in low-temperature catalytic combustion of chlorinated aromatic hydrocarbons. Background technique [0002] Chlorinated aromatic hydrocarbon pollutants mainly come from industrial production process leakage and discharge, municipal waste incineration or waste gas from thermal power plants, and their chemical properties are stable. Among them, polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated diphenylfurans (PCDF) are persistent organic pollutants that are highly toxic, carcinogenic, and cause persistent and cumulative effects on biological systems. In recent years, many countries have also proposed stricter environmental legislation and different control methods for the control and elimin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J23/75F23G7/07
CPCB01J23/78F23G7/07
Inventor 劳依杰戴启广王幸宜
Owner EAST CHINA UNIV OF SCI & TECH
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