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Catalyst for catalytically oxidizing low-concentration methane as well as preparation method and application of catalyst

A catalytic oxidation and catalyst technology, applied in the field of energy saving and environmental protection, can solve the problems of reducing exhaust gas, etc., and achieve the effect of high efficiency, high dispersion and good relative stability

Inactive Publication Date: 2018-07-27
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural gas engine exhaust contains some unburned CH 4 , and the exhaust gas temperature generally does not exceed 500°C. At present, the exhaust gas treatment catalyst is very effective in reducing CH in the exhaust gas 4 content of almost ineffective

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  • Catalyst for catalytically oxidizing low-concentration methane as well as preparation method and application of catalyst
  • Catalyst for catalytically oxidizing low-concentration methane as well as preparation method and application of catalyst
  • Catalyst for catalytically oxidizing low-concentration methane as well as preparation method and application of catalyst

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preparation example Construction

[0039] The present invention also provides a preparation method of the catalyst for catalytic oxidation of low-concentration methane, comprising the following steps:

[0040] A) Preparation of octahedral CeO by hydrothermal synthesis 2 particles;

[0041] B) the palladium source compound, citrate and the octahedral CeO 2 The particles are dispersed in water to obtain a suspension;

[0042] C) adding the reducing agent dropwise to the suspension, mixing and stirring to react to obtain the suspension;

[0043] D) drying and calcining the suspension to obtain a catalyst.

[0044] Firstly, octahedral CeO was prepared by hydrothermal synthesis 2 Particles, the specific preparation method is as described above, and will not be repeated here.

[0045] Get octahedral CeO 2 After the particles, the palladium source compound, citrate and the octahedral CeO 2 The particles are dispersed in water to obtain a suspension.

[0046] Specifically, the palladium source compound is dissolv...

Embodiment 1

[0077] Octahedral CeO 2 method of preparation.

[0078] 2.17g cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) Dissolve in 40ml of deionized water, then add 0.019g of trisodium phosphate, and fully stir at room temperature for 1h to form a uniform mixed solution. Then the mixed solution was transferred to a 250ml stainless steel hydrothermal reaction kettle with polytetrafluoroethylene lining and sealed, and heated in an oven at 170°C for 12h. After the solution was cooled, the obtained precipitate was centrifuged at 9000 rpm, washed repeatedly with deionized water and ethanol, and finally dried in an oven at 60°C for 12 hours to obtain a white solid (octahedral CeO 2 ).

[0079] 0.1mmolNa 2 PdCl 4 Dissolve in 100ml of deionized water, then add 0.8mmol of sodium citrate and fully dissolve. Then add 0.5247g octahedral CeO to the mixed solution 2 powder and sonicated for 1 h. 100ml of 0.1M NaBH 4 The solution was added dropwise to the suspension and stirred well at ro...

Embodiment 2

[0083] 2.17g cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) Dissolve in 40ml of deionized water, then add 0.019g of trisodium phosphate, and fully stir at room temperature for 1h to form a uniform mixed solution. Then the mixed solution was transferred to a 250ml stainless steel hydrothermal reaction kettle with polytetrafluoroethylene lining and sealed, and heated in an oven at 180°C for 24h. After the solution was cooled, the obtained precipitate was centrifuged at 9000 rpm, washed repeatedly with deionized water and ethanol, and finally dried in an oven at 60°C for 12 hours to obtain a white solid (cubic CeO 2 ).

[0084] 0.1mmolNa 2 PdCl 4 Dissolve in 100ml of deionized water, then add 0.8mmol of sodium citrate and fully dissolve. Then add 0.5247g cubic CeO to the mixed solution 2 powder and sonicated for 1 h. 100ml of 0.1M NaBH 4 The solution was added dropwise to the suspension and stirred well at room temperature. Then the mixed solution was fully stirred fo...

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Abstract

The invention provides a catalyst for catalytically oxidizing low-concentration methane. The catalyst is composed of octahedral CeO2 particles and Pd nano particles supported on the surfaces of the octahedral CeO2 particles. The catalyst for catalytically oxidizing the low-concentration methane provided by the invention is a Pd-based octahedral CeO2 catalyst, the Pd nano particles have a high dispersion degree and good relative stability on the surfaces of the carrier octahedral CeO2 particles, the catalyst has high catalytic oxidation efficiency of the low-concentration methane and good relative thermal stability, temperature required for complete conversion of the low-concentration methane is low, catalytic reaction products are H2O and CO2 which are environmentally-friendly products, and the catalyst has great application value in the field of catalytic oxidation of the low-concentration methane.

Description

technical field [0001] The invention belongs to the technical field of energy saving and environmental protection, and in particular relates to a catalyst for catalytic oxidation of low-concentration methane, a preparation method and application thereof. Background technique [0002] At present, people have realized the importance of protecting the environment. With the improvement of gasoline prices and exhaust emission standards, natural gas is considered an excellent alternative fuel due to its abundant reserves and simple storage and transportation methods. However, the main component of natural gas is methane, a typical greenhouse gas. The greenhouse effect has an important impact on climate change, one of the reasons is that a large amount of harmful greenhouse gases are emitted into the atmosphere, including CO 2 and CH 4 . Related literature reports that CH 4 The greenhouse effect of the equivalent CO 2 21-24 times that of CH in the past 20 years 4 The resulti...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01D53/86B01D53/72
CPCB01D53/8668B01J23/63B01D2257/7025B01J35/393B01J35/50Y02C20/20
Inventor 李文志雷言言林其钊黄启福关圣楠杨涛
Owner UNIV OF SCI & TECH OF CHINA
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