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High-temperature anoxic catalytic combustion catalyst as well as preparation method and application thereof

A catalytic combustion and catalyst technology, which is applied in catalyst activation/preparation, combustion methods, physical/chemical process catalysts, etc. High temperature stability, increased activity, and the effect of multiple active sites

Active Publication Date: 2021-10-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the active component of existing liquid nitrogen scrubbing tail gas catalysts is mostly palladium, but palladium is a precious metal, and the market price is about 600 yuan per gram. The cost of preparing catalysts with palladium as the active component is too high. In addition, when liquid nitrogen When the CO concentration in the exhaust gas is slightly higher than 9%, the existing low-temperature anoxic catalyst for exhaust gas scrubbing with liquid nitrogen is only suitable for low temperatures below 500 ° C, and the calorific value is high under high temperature conditions, which is easy to sinter; the existing high-temperature peroxygen catalyst It can adapt to high temperature above 800°C, but it is not suitable for hypoxic environment, which is easily caused by CH 4 Cracking and CO disproportionation reactions lead to catalyst deactivation due to carbon deposition, and catalyst sintering deactivation due to high temperature

Method used

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  • High-temperature anoxic catalytic combustion catalyst as well as preparation method and application thereof
  • High-temperature anoxic catalytic combustion catalyst as well as preparation method and application thereof

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preparation example Construction

[0046] The present invention also provides a preparation method of the high-temperature anoxic catalytic combustion catalyst described in the above technical solution, comprising the following steps:

[0047] Mix soluble cerium salt, soluble zirconium salt, soluble yttrium salt, soluble lanthanum salt, urea and water, heat homogeneous precipitation reaction and the first hydrothermal reaction in sequence, and then carry out the first roasting of the obtained precipitated product to obtain the first carrier product;

[0048] Mix the first carrier product, water, ethyl acetate, citric acid, soluble noble metal salt and hydrazine hydrate, and undergo a reduction reaction to obtain the first dispersed product; the soluble noble metal salt includes soluble ruthenium salt and / or soluble platinum salt ;

[0049] Mix dodecylamine, the first dispersion product, solvent and tetraethyl orthosilicate, after self-assembly of polymerization reaction, add the soluble salt corresponding to t...

Embodiment 1

[0095] 45.39gCe(NO 3 ) 3 ·6H 2 O, 62.70g Zr(NO 3 ) 4 ·5H 2 O, 8.47g Y (NO 3 ) 3 ·6H 2 O, 6.7gLa(NO 3 ) 3 ·6H 2 Mix O and 454g of water to obtain a mixed metal salt solution, add 86.57g of urea (the total molar ratio of Ce, Zr, Y and La ions to urea is 1:5) and stir for 2h, and heat at 95°C to generate a homogeneous phase After 5 hours of precipitation reaction, hydrothermal reaction was carried out at 150°C for 24 hours, filtered, washed 6 times with deionized water, dried at 80°C for 6 hours, and calcined at 700°C for 2 hours to obtain 41.02 g of the first carrier product;

[0096] After mixing 41.02 g of the first carrier product and 12.3 g of water, add 0.38 g of RuCl 3 ·6H 2 O, 28.71g citric acid, 0.37g H 14 Cl 6 o 6 Pt and 16.4g of ethyl acetate were stirred for 3h, 0.19g of hydrazine hydrate was added, and a reduction reaction occurred. The conditions of the reduction reaction were stirring at room temperature, filtering, and mixing the resulting 41.3g sol...

Embodiment 2

[0100] 52.96g Ce(NO 3 ) 3 ·6H 2 O, 73.15g Zr(NO 3 ) 4 ·5H 2 O, 13.56gY (NO 3 ) 3 ·6H 2 O, 6.64gLa(NO 3 ) 3 ·6H 2Mix O and 529.6g of water to obtain a mixed metal salt solution, add 103.6g of urea (the total molar ratio of Ce, Zr, Y and La ions to urea is 1:5), stir for 2 hours, and heat at 90°C After homogeneous precipitation reaction for 6 hours, conduct hydrothermal reaction at 150°C for 24 hours, filter, wash with deionized water for 6 times, dry at 80°C for 6 hours, and roast at 800°C for 2 hours to obtain 48.5 g of the first carrier product;

[0101] After mixing 48.5 g of the first carrier product and 14.55 g of water, add 0.77 g of RuCl 3 ·6H 2 O, 33.95g citric acid, 0.21g H 14 Cl 6 o 6 Pt and 19.4g of ethyl acetate were stirred for 3 hours, 0.37g of hydrazine hydrate was added, and a reduction reaction occurred. The conditions of the reduction reaction were stirring at room temperature, filtering, and mixing the obtained 48.8g of solids with 32.33g of ab...

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Abstract

The invention relates to the technical field of tail gas catalytic oxidation, in particular to a high-temperature anoxic catalytic combustion catalyst as well as a preparation method and the application thereof. The high-temperature oxygen-deficient catalytic combustion catalyst comprises a carrier with a mesoporous structure and a noble metal active component loaded in the carrier with the mesoporous structure, the carrier with the mesoporous structure is CeO2-ZrO2 (at) HMS; ceO2-ZrO2 in the CeO2-ZrO2 (at) HMS is doped with yttrium oxide and lanthanum oxide, and the yttrium oxide and the lanthanum oxide are doped in the CeO2-ZrO2 (at) HMS; the noble metal active components are Ru and Pt. The high-temperature oxygen-deficient catalytic combustion catalyst has good catalytic efficiency and carbon deposition resistance under the high-temperature oxygen-deficient condition.

Description

technical field [0001] The invention relates to the technical field of tail gas catalytic oxidation, in particular to a high-temperature anoxic catalytic combustion catalyst and its preparation method and application. Background technique [0002] The liquid nitrogen scrubbing tail gas contains CO (5-10%), H 2 (1~4%), CH 4 (1~1.5%), Ar and N 2 Such as gas, calorific value is about 1200 ~ 2100kJ / m 3 . Liquid nitrogen scrubbing tail gas does not contain oxygen. Although the CO content is high, it is difficult to burn directly even if air is added. Liquid nitrogen washing tail gas is not allowed to be discharged directly. In order to meet environmental protection requirements, some enterprises use the method of adding synthesis gas to increase the combustible gas components in liquid nitrogen washing tail gas and then light "sky lanterns" to burn. This not only wastes resources, but also causes a large amount of greenhouse gases. Emissions are also caused by incomplete com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J37/10B01J37/03B01J37/18F23G7/07
CPCB01J29/0308B01J29/0333B01J29/0341B01J29/0325B01J37/18F23G7/07B01J2229/186
Inventor 崔思涵张秋林陈建军吕冬丽张鹏宇刘隽妤
Owner KUNMING UNIV OF SCI & TECH
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