A perovskite-type honeycomb monolithic methane catalytic combustion catalyst and preparation method thereof

A methane catalytic combustion, perovskite-type technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of cumbersome catalyst preparation methods and low loading. and other problems, to achieve the effect of preventing agglomeration and sintering, increasing the load and stable performance.

Active Publication Date: 2019-11-05
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art that the active component of the perovskite catalyst has a low load on the carrier and the preparation method of the catalyst is cumbersome, thereby providing a high active component load, and Perovskite-type honeycomb integral methane catalytic combustion catalyst with simple preparation method and preparation method thereof

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  • A perovskite-type honeycomb monolithic methane catalytic combustion catalyst and preparation method thereof
  • A perovskite-type honeycomb monolithic methane catalytic combustion catalyst and preparation method thereof
  • A perovskite-type honeycomb monolithic methane catalytic combustion catalyst and preparation method thereof

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Embodiment 1

[0028] The preparation method of the perovskite honeycomb monolithic methane catalytic combustion catalyst provided in this embodiment comprises the following steps:

[0029] A 300-mesh cordierite with a diameter of 2.5 cm and a height of 7.5 cm was used as a honeycomb carrier; lanthanum nitrate, calcium nitrate, iron nitrate, and manganese nitrate were formulated into an aqueous solution of the precursor of the perovskite-type active component; the metal The molar ratio of ion lanthanum: calcium: iron: manganese is 9:1:1:9, and the total molar concentration of metal ions is 1.5mol / L;

[0030] The above-mentioned cordierite honeycomb carrier was impregnated into the aqueous solution of the precursor of the above-mentioned active component, fully impregnated, dried naturally, dried at 120°C for 5.5h, and then calcined at 800°C for 2.5h to obtain catalyst A, in which the active component was The loading on the carrier was 20%.

Embodiment 2

[0032] The preparation method of the perovskite honeycomb monolithic methane catalytic combustion catalyst provided in this embodiment comprises the following steps:

[0033] A 300-mesh mullite with a diameter of 2.5 cm and a height of 7.5 cm is used as a honeycomb carrier; lanthanum nitrate, calcium nitrate, iron nitrate, and manganese nitrate are formulated into an aqueous precursor solution of a perovskite-type active component; The molar ratio of metal ion lanthanum: calcium: iron: manganese is 9:1:1:9, and the total molar concentration of metal ions is 1.5mol / L;

[0034] Immerse the above-mentioned mullite honeycomb carrier into the aqueous solution of the precursor of the above-mentioned active component, fully impregnate it, dry it naturally, dry it at 120°C for 5.5h, and then calcinate it at 800°C for 2.5h to obtain Catalyst B, in which the active component The loading on the carrier was 21%.

Embodiment 3

[0036] The preparation method of the perovskite honeycomb monolithic methane catalytic combustion catalyst provided in this embodiment comprises the following steps:

[0037] A 300-mesh aluminum oxide with a diameter of 2.5 cm and a height of 7.5 cm was roasted at 950 ° C for 2.5 hours and then used as a honeycomb carrier; lanthanum oxide, calcium oxide, iron oxide, and manganese oxide were dissolved in nitric acid to form perovskite The precursor aqueous solution of type active component; Wherein metal ion lanthanum: Calcium: Iron: The molar ratio of manganese is 9:1:1:9, and the total molar concentration of metal ion is 1.5mol / L;

[0038] Immerse the calcined alumina carrier into the aqueous solution of the precursor of the active component, fully impregnate it, and dry it naturally. After drying at 120°C for 5.5h, it is calcined at 800°C for 2.5h to obtain catalyst C, wherein the active component The loading on the carrier was 23%.

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Abstract

The invention provides a perovskite type honeycomb integral methane catalytic combustion catalyst and a preparation method thereof. The catalyst comprises an active component and an inert honeycomb carrier, wherein the general formula of the active component is A(1-x)A'xB(1-y)B'yO(3-delta), A is a rare-earth metal element, A' is an alkaline-earth metal element, and B and B' are transition metal elements; x is more than or equal to 0 and less than or equal to 0.9, and y is more than or equal to 0 and less than or equal to 0.9; and delta is an arithmetic number, and has a carrier of a cordierite-based honeycomb carrier, a mullite-based honeycomb carrier or an alumina-based honeycomb carrier. On the one hand, the catalyst does not need a metal oxide coating, has good thermal stability, and has relatively high active component loading capacity on the carrier; and on the other hand, the preparation method can be used for reducing metal oxide coating preparation process and other steps, and organic acid is not needed to be added in preparation of an active component solution, so that the preparation process is greatly simplified, and industrial application of the catalyst is favored.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a perovskite honeycomb monolithic methane catalytic combustion catalyst and a preparation method thereof. Background technique [0002] Methane is a stable hydrocarbon with a regular tetrahedral molecular structure (C-H bond energy 413kJ / mol). There is a large amount of low-concentration methane in mine ventilation (VAM), which cannot be carried out by traditional combustion and is difficult to recover. In the process of oil and coal mining, there will be a large amount of oilfield associated gas and coalbed methane. Due to the constraints of technical means, and the associated gas is relatively difficult to control in the process of oilfield and coal mining, a large part of oilfields containing low concentration methane ( or coal bed methane) associated gas is evacuated, in addition, there will always be a large amount of methane-containing gas emitted from industr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J35/10
CPCB01J23/002B01J23/8892B01J35/10B01J2523/00B01J2523/23B01J2523/3706B01J2523/72B01J2523/842B01J2523/17B01J2523/31
Inventor 张志民刘振义高群仰
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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