A low-temperature methane combustion catalyst for ebullating bed reactors and its preparation method and application

A fluidized bed reactor and low-temperature combustion technology, which is applied in the fields of environmental protection and chemical engineering, and achieves the effects of high load capacity, high combustion efficiency, and simple preparation process

Active Publication Date: 2019-12-10
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

[0007] The technical problem to be solved by the present invention is to overcome the defects that the existing methane low-temperature combustion catalysts are mostly suitable for fixed-bed reactors, and then provide a catalyst suitable for ebullating-bed reactors with good high-temperature stability, uniform dispersion of active components on the carrier and Methane low-temperature combustion catalyst with high loading capacity, simple preparation method, and suitable for industrial large-scale production

Method used

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  • A low-temperature methane combustion catalyst for ebullating bed reactors and its preparation method and application
  • A low-temperature methane combustion catalyst for ebullating bed reactors and its preparation method and application
  • A low-temperature methane combustion catalyst for ebullating bed reactors and its preparation method and application

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Embodiment 1

[0033] The preparation method of the methane low-temperature combustion catalyst provided in this embodiment comprises the following steps:

[0034] Aluminum hydroxide with a particle size of 20-200 μm is roasted at 750°C for 6 hours and then used as a microspherical carrier; lanthanum nitrate, calcium nitrate, cobalt nitrate, manganese nitrate and citric acid are prepared as the precursor of the perovskite active component Body solution; wherein the metal ion lanthanum: calcium: cobalt: the molar ratio of manganese is 9:1:5:5, and the ratio of citric acid to the total molar weight of metal ions (lanthanum, calcium, cobalt, manganese) is 1:1 , the perovskite active component precursor solution was loaded on the microspherical carrier with a loading rate of 5%, dried at 60°C for 5h, and then calcined at 700°C for 4.5h to obtain catalyst A.

Embodiment 2

[0036] The preparation method of the methane low-temperature combustion catalyst provided in this embodiment comprises the following steps:

[0037] Aluminum hydroxide with a particle size of 20-200 μm is roasted at 1100°C for 1.5 hours and then used as a microspherical carrier; lanthanum nitrate, strontium nitrate, cobalt nitrate, manganese nitrate and citric acid are used to make perovskite active components Precursor solution; wherein the molar ratio of metal ions lanthanum: strontium: cobalt: manganese is 7:3:5:5, and the ratio of citric acid to the total molar weight of metal ions (lanthanum, strontium, cobalt, manganese) is 0.5 : 1, loading the perovskite active component precursor solution on the microspherical carrier with a loading rate of 30%, drying at 60°C for 12h, and roasting at 900°C for 2h to obtain catalyst B.

Embodiment 3

[0039] The preparation method of the methane low-temperature combustion catalyst provided in this embodiment comprises the following steps:

[0040] κ-Al obtained by calcining aluminum hydroxide with a particle size of 20-200 μm at 1200 ° C for 0.5 h 2 o 3 and α-Al 2 o 3 Alumina of mixed crystal phase is used as microsphere support (such as figure 1 shown); Lanthanum nitrate, barium nitrate, copper nitrate, manganese nitrate and lactic acid are made into the precursor solution of perovskite type active component; Wherein metal ion lanthanum: barium: copper: the molar ratio of manganese is 5: 5:1:9, the total molar ratio of lactic acid to metal ions (lanthanum, strontium, cobalt, manganese) is 2:1, the perovskite active component precursor solution is loaded on the microspherical carrier, and the loading rate is 2%, dried at 120°C for 1.0h, and then calcined at 1000°C for 1.0h to obtain catalyst C.

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Abstract

The invention provides a methane low-temperature combustion catalyst for a boiling-bed reactor as well as a preparation method and application of the methane low-temperature combustion catalyst. The methane low-temperature combustion catalyst consists of alumina supporters and active components, wherein the alumina supporters are alumina microspheres generated from aluminum hydroxide through high-temperature roasting, the alumina microspheres comprise spherical supporters of kappa-Al2O3, delta-Al2O3, theta-Al2O3 or alpha-Al2O3; the active component is a perovskite type composite metal oxide. The alumina supporters provided by the invention have relatively large specific surface areas and are relatively high in water absorption rate, so that the loading capacity of the active component on the support can be increased, the active component is not liable to drop off, secondly, the roasted alumina supporters can directly load the active component by using an impregnation method, the preparation process is simple, the active components are uniformly distributed, the stability is high, in addition, the catalyst provided by the invention is high in catalytic activity, good in mobility and high in bulk density and can be used in the boiling-bed reactor.

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 methane low-temperature combustion catalyst used in an ebullating bed reactor, a preparation method and application thereof. Background technique [0002] In the process of oil extraction, a large amount of oilfield associated gas will be produced. Due to the constraints of technical means and the fact that associated gas is relatively difficult to control during oilfield exploitation, a large part of oilfield associated gas containing low-concentration methane is emptied. In addition, there will always be a large amount of methane-containing gas emitted from industrial vent gas. The methane in oilfield associated gas and industrial vent gas has no recycling value because the concentration is too low. If it is directly discharged into the air, it will cause serious greenhouse effects (the greenhouse effect of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J23/83F23G7/07
CPCB01J23/002B01J23/83B01J23/8892B01J2523/00F23G7/07B01J2523/3706B01J2523/23B01J2523/845B01J2523/72B01J2523/31B01J2523/24B01J2523/25B01J2523/17
Inventor 张君刘振义高群仰刘营张志民刘玉军崔永君
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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