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A method for catalytic combustion of chlorine-containing volatile organic compounds

An organic compound, catalytic combustion technology, applied in the direction of combustion method, combustion type, incinerator, etc., can solve the problems of poor adhesion, coating peeling, etc., and achieve high surface acidity, good low-temperature activity, and strong resistance to halogen poisoning.

Active Publication Date: 2020-10-16
贵州宇源新能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the smoother surface of the metal and the larger thermal expansion coefficient make the adhesion between the active coating prepared by the traditional coating method and the metal substrate poor, and the coating is easy to fall off from the substrate. This problem is recognized as the MMC Bottlenecks in Catalyst Development

Method used

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  • A method for catalytic combustion of chlorine-containing volatile organic compounds
  • A method for catalytic combustion of chlorine-containing volatile organic compounds
  • A method for catalytic combustion of chlorine-containing volatile organic compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] According to the present invention, adopt above-mentioned catalyst to carry out catalytic combustion of chlorine-containing volatile organic compound, method is as follows:

[0062] Cut the flat sample into 4mm 2 The fragments were evenly mixed with quartz sand (40-50 mesh), and filled into a quartz reaction tube with an inner diameter of 10 mm. Nitrogen is fed into the DCM (or o-DCB) saturated evaporator at constant temperature, and the concentration of DCM (or o-DCB) is adjusted by controlling the temperature of the saturator. After nitrogen carrying DCM (or o-DCB) is mixed with oxygen, it is passed into a quartz reaction tube equipped with a catalyst, and the reaction temperature is controlled by a thermocouple installed in the center of the catalyst bed. The composition of the inlet gas mixture of 120mL / min is controlled as 900ppm DCM / 20%O 2 (V%) / N 2 . The F / w of the reaction was set to 25000mL / (h·g) (the mass of the metal substrate was not included in the calcu...

Embodiment 2

[0065] Select commercial gamma-alumina (Aladdin's gamma-alumina (Aladdin Industrialcorporation, CAS: 1344-28-1) as comparative sample 7, compare the performance of sample 4 and sample 7 on DCM catalytic combustion. Test method is as implemented Example 1. The test results are shown in Table 2 and Figure 6.

[0066] Table 2

[0067]

[0068] The conversion rate of DCM on sample 4 is significantly better than that of commercial γ-Al 2 o 3 . Sample 4 obtained a DCM conversion rate of 91.7% at 350 °C, which is higher than that of commercial γ-Al 2 o 3 72% got on. At 400-450°C, sample 4 can almost completely convert DCM. Moreover, comparing the reaction products of DCM, it can also be found that there is a big difference between the two. Below 400°C, HCl is mainly generated on sample 4, while in commercial γ-Al 2 o 3 Mainly monochloromethane. That is, most of the chlorine contained in the DCM on sample 4 was converted to HCl. This is considered to be a more desirable r...

Embodiment 3

[0070] In this example comparative sample 4 and sample 7 (commercial γ-Al 2 o 3 ) Catalyst durability on DCM catalytic combustion at 400°C, the method is basically the same as in Example 1. As shown in Fig. 7(a), under the condition of oxygen and no water, no obvious catalyst deactivation was observed in Sample 4 at 400 °C for 120 h, showing good durability. In contrast, under the same conditions, sample 7 (commercial γ-Al 2 o 3 ) on the DCM conversion rate decreased gradually, and obvious inactivation occurred.

[0071] Further, under anaerobic conditions, the durability of sample 4 in the presence or absence of water vapor was investigated, as shown in Figure 7(b). In an oxygen-free atmosphere, DCM mainly undergoes decomposition reactions on sample 4 (methane chloride, HCl, Cl 2 Wait). In the absence of oxygen and water, the conversion rate of DCM dropped from 87% to 27% within 4 hours; and in the presence of 1.0vol% water vapor, the decomposition rate of DCM within 4 ...

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Abstract

The invention discloses a method for catalytic combustion of a chlorine-containing volatile organic compound. A non-coated metal matrix monolithic catalyst carrier or catalyst based on disclosed CN201710423251.4 is applied to the catalytic combustion reaction of CVOCs, and the method for the catalytic combustion of the chlorine-containing volatile organic compound is characterized by high ratio superficial area, activated aluminum oxide layer, relatively high surface acidity, hydrophilicity and the like; and the catalytic combustion reaction of the CVOCs has good low-temperature activity, selectivity and durability. According to the method, the CVOCs can be completely catalyzed and combusted at a relatively low temperature so as to achieve the purpose of deep purification, chlorine in thereaction product is mainly converted into HCl, and the catalyst in the method has relatively strong anti-halogen poisoning resistance, and the method can be applied to the catalytic combustion of chlorine-containing volatile organic compounds such as DCM, o-DCB and the like in waste gas in the atmospheric environment-friendly field.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a treatment method for chlorine-containing volatile organic compounds, in particular to a method for catalytic combustion of chlorine-containing volatile organic compounds. Background technique [0002] Chlorinated Volatile Organic Compounds (CVOCs) are highly toxic and bioaccumulative, which have caused many environmental and human health problems. Among CVOCs, dichloromethane (DCM) and o-dichlorobenzene (1,2-Dichlorobenzene, o-DCB) are widely used in modern industrial production as excellent solvents, and their treatment is particularly urgent. Catalytic combustion is considered to be one of the most promising technologies for treating CVOCs due to the advantages of low processing temperature, low energy consumption, high efficiency, and simple process. The catalyst with high efficiency and good stability becomes the key to the catalytic combustion of dichlorome...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G7/07
CPCF23G7/07F23G2209/14
Inventor 郭燏赵阳林益孙路刘怡张传奇王峰任合成周超孟浩
Owner 贵州宇源新能科技有限公司