Perovskite type methane combustion catalyst as well as preparation method and application thereof

A methane combustion and perovskite-type technology, which is applied in the fields of environmental protection and chemical engineering, can solve problems such as inapplicability, and achieve the effects of prolonging service life, good mass and heat transfer performance, and increasing load capacity

Active Publication Date: 2017-05-31
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the perovskite-type catalyst in the prior art is only suitable for catalytic combustion of carbon monoxide but not for catalytic combustion of methane, and then provide a perovskite-type catalyst for catalytic methane combustion, And further provide the preparation method of this catalyst

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  • Perovskite type methane combustion catalyst as well as preparation method and application thereof
  • Perovskite type methane combustion catalyst as well as preparation method and application thereof
  • Perovskite type methane combustion catalyst as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0035] The preparation method of the perovskite type methane combustion catalyst provided by the present embodiment comprises the following steps:

[0036] (1) Weigh 1kg ball nuts and put them into a pan granulator, spray a small amount of 5wt% aluminum sol to wet the ball nut surface, then add pseudoboehmite powder and alumina sol alternately, until the particles grow up to After 4-6mm, take it out and sieve the balls with a particle size of 4-6mm. In this step, add 102.9kg of pseudoboehmite powder and 22kg of aluminum sol; dry the above-mentioned alumina pellets at 120°C for 2 hours, Roasted for 4 hours to obtain δ-Al 2 o 3 and θ-Al 2 o 3 Alumina spherical support of mixed crystal phase (such as figure 1 Shown), the water absorption rate of the carrier is 50%.

[0037] (2) Add 38.0gLa 2 o 3 Put it into a 500mL beaker, add 66.7mL of nitric acid with a mass concentration of 65-68%. At this time, it will emit heat and gas. After the dissolution is completed, a colorless ...

Embodiment 2

[0040] The preparation method of the perovskite type methane combustion catalyst provided by the present embodiment comprises the following steps:

[0041] (1) Weigh 2.1kg ball nuts and put them into a pan granulator, spray a small amount of 7wt% aluminum sol to wet the ball ball surface, then add pseudoboehmite powder and alumina sol alternately, and wait for the particles to grow After reaching 4-6mm, take it out and sieve the balls with a particle size of 4-6mm. In this step, 102.1kg of pseudoboehmite powder and 12kg of aluminum sol are added; the above-mentioned alumina pellets are dried at 80°C for 12 hours, ℃ for 3 hours to obtain an alumina spherical carrier with a water absorption rate of 40%.

[0042] (2) 54.3gLa 2 o 3 Put it into a 500mL beaker, add 95.2mL of nitric acid with a mass concentration of 65-68%. At this time, it will emit heat violently and emit gas. After the dissolution is completed, a colorless and transparent solution is obtained. Then add 133.3mL o...

Embodiment 3

[0045] The preparation method of the perovskite type methane combustion catalyst provided by the present embodiment comprises the following steps:

[0046] (1) Weigh 5.3kg ball nuts and put them into a pan granulator, spray a small amount of 9wt% aluminum sol to wet the ball nut surface, then add pseudo-boehmite powder and alumina sol alternately, and wait for the particles to grow After reaching 4-6mm, take it out and sieve the balls with a particle size of 4-6mm. In this step, add 99kg of pseudo-boehmite powder and 8.8kg of aluminum sol; dry the above-mentioned alumina pellets at 100°C for 8 hours, ℃ for 3 hours to obtain an alumina spherical carrier with a water absorption rate of 45%.

[0047] (2) Add 5.4gLa 2 o 3 Put it into a 500mL beaker, add 9.5mL of nitric acid with a mass concentration of 65% to 68%. At this time, it will exotherm violently and emit gas. After the dissolution is completed, a colorless and transparent solution is obtained. Weigh 130.2gCe(NO 3 ) 3...

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Abstract

The invention provides a perovskite type methane combustion catalyst as well as a preparation method and application thereof. The catalyst comprises an active component and a carrier, wherein the active component has a general formula: Al-xA'xB1-yB'yO3; in the formula, A is a rare earth metal element; A' is an alkaline earth metal element; B and B' represent transition metal elements; x is more than or equal to 0 but less than or equal to 0.9; y is more than or equal to 0 but less than or equal to 0.9; the carrier consists of spherical aluminum oxide of at least two crystal phases in delta-Al2O3, theta-Al2O3 or alpha-Al2O3, The aluminum oxide carrier has larger specific surface area, so that the loading capacity of the active component on the carrier can be improved; meanwhile, the uniform dispersion of the active component is facilitated, so that the sintered agglomeration of the active component is prevented, and the service life of the catalyst is prolonged; in addition, the catalyst provided by the invention is good in activity, and the selectivity of the reaction of methane and oxygen for CO2 is high; the perovskite type methane combustion catalyst has the advantages of being low in initiation temperature, high in combustion efficiency, good in mass transfer and heat transfer performance, and the like.

Description

technical field [0001] The invention belongs to the technical fields of environmental protection and chemistry and chemical engineering, and in particular relates to a perovskite-type methane combustion catalyst and its preparation method and application. Background technique [0002] Environmental pollution and energy shortage have become important issues affecting our lives. As one of the three major energy sources, natural gas has the advantages of abundant reserves, low price, convenient use, and high thermal efficiency. However, its main component, methane, has a high combustion temperature and adopts traditional combustion methods. produce more NO x , CO, HC and other pollutants, and the energy utilization rate is low. Therefore, in order to burn methane with high efficiency and low pollution, it is necessary to reduce its combustion temperature. Catalytic combustion is considered to be the most effective way to solve this problem. Catalytic combustion can reduce the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/83F23G7/07
CPCB01J23/002B01J23/83B01J23/8892B01J2523/00F23G7/07B01J2523/3706B01J2523/24B01J2523/842B01J2523/72B01J2523/3712B01J2523/23B01J2523/847
Inventor 刘营刘振义高群仰张君张志民刘玉军崔永君
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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