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Catalyst for catalytic combustion of organic volatile waste gas and preparation method thereof

A catalytic combustion and catalyst technology, applied in the field of catalysis, can solve the problems of poor thermal stability, large grain size of high-entropy oxides, and low specific surface area, achieve high hydrothermal stability, improve catalytic combustion performance, and increase specific surface area. Effect

Active Publication Date: 2021-11-16
天津环科环境咨询有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of traditional catalytic combustion catalysts such as water, poor thermal stability, large grain size and low specific surface area of ​​high-entropy oxides, and provides a catalyst for catalytic combustion of organic volatile waste gas and a preparation method thereof. The catalyst is used in the catalytic combustion process of cyclohexane, and has good low-temperature combustion activity and high-temperature hydrothermal stability

Method used

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  • Catalyst for catalytic combustion of organic volatile waste gas and preparation method thereof
  • Catalyst for catalytic combustion of organic volatile waste gas and preparation method thereof
  • Catalyst for catalytic combustion of organic volatile waste gas and preparation method thereof

Examples

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Effect test

preparation example Construction

[0031] The preparation method of the above-mentioned catalyst for the catalytic combustion of organic volatile waste gas, the specific steps are:

[0032] S1. According to the type of active components in the prepared catalyst, Fe 3+ Soluble salts and Ni 2+ 、Co 2+ , Zn 2+ , Mn 2+ 、Cu 2+ For four of the five soluble salts, dissolve the weighed soluble salts in deionized water, then add citric acid in proportion, and stir at room temperature for 2-4 hours to obtain a clear sol of mixed metal ions;

[0033] S2. Add a certain amount of γ-Al to the clarified sol of the above-mentioned mixed metal ions 2 o 3 The precursor of the carrier is stirred for 1-3h to obtain a mixture;

[0034] S3. Transfer the above mixture to water at 70-90°C, and evaporate the water under rapid stirring conditions to obtain a viscous gel;

[0035] S4. Transfer the prepared viscous gel to a vacuum oven and dry at 80-120°C for 12-24h. The obtained dried sample is ground and calcined at 600-1200°C fo...

Embodiment 1

[0044] Weigh Fe(NO 3 ) 3 9H 2 O and Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Zn(NO 3 ) 2 ·6H 2 O, Mn(NO 3 ) 2 4H 2 O, Cu(NO 3 ) 2 ·6H 2 O Dissolve any four of the five nitrates in deionized water (the total concentration of metal ions is 5 mol / L), then add citric acid in proportion (the molar ratio of citric acid to total metal ions is 3:1), at room temperature Stirring under the same conditions for 4 hours to obtain a clear sol of mixed metal ions; then add pseudo-boehmite powder according to the ratio of the mass loading of the obtained high-entropy oxide to 20%, and stir for 2 hours; The water was evaporated to dryness under rapid stirring conditions to obtain viscous gels; the prepared gels were transferred to a vacuum oven and dried at 120°C for 12 hours, and the dried samples were ground and calcined at 850°C for 4 hours to obtain supported type (FeCoNiCuMn) 3 o 4 / Al 2 o 3 , (FeCoZnCuMn) 3 o 4 / Al 2 o 3 , (FeZnNiCuMn) 3 o 4 / Al 2 o 3 , (FeC...

Embodiment 2

[0046] Prepare (FeCoNiCuMn) by the same method of embodiment 1 3 o 4 / Al 2 o 3 Catalysts, by adjusting the amount of pseudo-boehmite powder to change the loading of high-entropy oxides, prepared (FeCoNiCuMn) 3 o 4 The mass content is respectively 10%, 20% and 30% of supported high entropy oxide catalysts.

[0047] implement pour 3

[0048] The same method as in Example 2 prepared a load of 20% (FeCoNiCuMn) 3 o 4 / Al 2 o 3 Catalysts, changing the calcination temperature of high-entropy oxides, prepared (FeCoNiCuMn) calcined at 700 °C, 750 °C, 800 °C, 850 °C and 900 °C 3 o 4 / Al 2 o 3 catalyst.

[0049] by N 2 Adsorption / desorption method The specific surface area, pore volume and average pore diameter of the catalysts in Comparative Example 1 and Example 1 were measured, and the results are shown in Table 1.

[0050]

[0051] The data in Table 1 shows that the specific surface area and pore volume of Comparative Example 1 are very small, which can be considere...

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Abstract

The invention relates to a catalyst for catalytic combustion of organic volatile waste gas and a preparation method of the catalyst. A carrier of the catalyst is gamma-Al2O3; and an active component of the catalyst is a five-membered spinel structure high-entropy oxide. The preparation method comprises the following steps: according to the type of the active component in the prepared catalyst, weighing soluble salt according to an equimolar ratio of metal ions, dissolving the soluble salt in deionized water, adding citric acid according in proportion, and performing stirring at room temperature to obtain clear sol; adding a certain amount of a gamma-Al2O3 carrier precursor, and conducting stirring to obtain a mixture; transferring the mixture into water, and conducting evaporating water under a rapid stirring condition to obtain viscous gel; and drying, grinding and calcining the prepared viscous gel to obtain a catalyst product. The catalyst has relatively good low-temperature activity and relatively high hydrothermal stability; and the method reduces the grain size of high-entropy oxide, increases the specific surface area of the catalyst, improves the combustion performance, reduces the content of the high-entropy oxide in the catalyst, and lowers cost.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a catalyst for catalytic combustion of organic volatile waste gas and a preparation method thereof. Background technique [0002] Volatile organic waste gas (VOCs) is one of the main pollution sources of the atmosphere, which will pose a serious threat to human health. The purification and elimination of VOCs in the atmosphere is a hot and difficult issue in scientific research. Now catalytic combustion technology is mostly used for processing. Catalytic combustion technology can catalytically oxidize organic waste gas to CO under the action of a catalyst 2 and H 2 O, which has the advantages of low energy consumption, low operating temperature, high purification efficiency, wide application range, safety and reliability, etc. The key to this technology lies in the development of high activity and high stability catalysts. [0003] Existing studies have shown that although th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/80B01J35/10B01J37/03B01J37/08F23G7/07
CPCB01J23/8892B01J23/80B01J23/002B01J37/036B01J37/082F23G7/07B01J2523/00F23G2209/14B01J35/612B01J35/613B01J35/633B01J35/647B01J2523/17B01J2523/72B01J2523/842B01J2523/845B01J2523/847B01J2523/31B01J2523/27
Inventor 桑换新王钰田顺陈伟杨功兵贺立争张硕崔浩然贺红梅孙文秀
Owner 天津环科环境咨询有限公司
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