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Double-perovskite metal oxide catalyst and preparation method thereof

A double perovskite, oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the rare rare earth double-layer perovskite type, etc. question

Inactive Publication Date: 2015-06-17
CHUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, the application of other double-layer perovskite composite oxides to catalyze methane combustion has not been reported, and the rare earth double-layer perovskite as a methane combustion catalyst is even rarer.

Method used

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preparation example Construction

[0076] Method one, the preparation method of a kind of double perovskite metal oxide catalyst that the present invention proposes, comprises the steps:

[0077] S1, the La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 , Fe(NO 3 ) 3 9H 2 O and Co(NO 3 ) 2 ·6H 2 O was dissolved in deionized water to obtain the first solution; the MoO 3 Dissolved in aqueous ammonia to obtain the second solution;

[0078] S2, the first solution obtained by S1, the second solution and (NH 4 ) 2 CO 3 The solution is added to the reactor and heated and stirred to obtain a reaction solution;

[0079] S3, after standing the reaction solution obtained in S2, suction filtration, washing, and drying to obtain material A;

[0080] S4. Grinding the material A obtained in S3, roasting in a muffler furnace, pressing into tablets, and sieving to obtain a double perovskite metal oxide catalyst.

[0081] Method two, the preparation method of a kind of double perovskite metal oxide catalyst that the present inven...

Embodiment 1

[0099] A double perovskite metal oxide catalyst, the general formula of the double perovskite metal oxide catalyst is LaSrFeMo 0.9 co 0.1 o 6 .

[0100] The preparation method of the described double perovskite metal oxide catalyst comprises the steps of:

[0101] S1, 5.4mmol La(NO3 ) 3 ·6H 2 O, 5.4mmol Sr(NO 3 ) 2 , 5.4mmol Fe(NO 3 ) 3 9H 2 O and 0.54mmol Co(NO 3 ) 2 ·6H 2 O was dissolved in deionized water to obtain the first solution with a concentration of 0.5mol / L, and 4.86mmol MoO 3 Add ammonia water, obtain the second solution after completely dissolving;

[0102] S2, the first solution obtained by S1, the second solution and the (NH 4 ) 2 CO 3 Add the solution into the reactor, stir for 1.5 hours in a constant temperature water bath at 60°C to obtain a reaction solution, and keep the pH value of the reaction solution between 6.5-9 during the stirring process;

[0103] S3. After standing the reaction solution obtained in S2 for 3 hours, vacuum suction f...

Embodiment 2

[0108] A double perovskite metal oxide catalyst, the general formula of the double perovskite metal oxide catalyst is LaSrFeMo 0.9 co 0.1 o 6 .

[0109] The preparation method of described double perovskite metal oxide catalyst comprises the steps:

[0110] S1, 5.4mmol La(NO 3 ) 3 ·6H 2 O, 5.4mmol Sr(NO 3 ) 2 , 5.4mmol Fe(NO 3 ) 3 9H 2 O and 0.54mmol Co(NO 3 ) 2 ·6H 2 O was dissolved in deionized water to obtain the first solution with a concentration of 0.45mol / L, and 4.86mmol MoO 3 Dissolve in ammonia water to obtain the second solution after completely dissolving; dissolve 29.16 mmol of citric acid or cellulose in deionized water to obtain the third solution with a concentration of 0.8 mol / L;

[0111] S2. Add the first solution, the second solution, and the third solution obtained in S1 into the reactor, stir the gel precursor obtained by the reaction at 60°C for 1.5h, and control the pH value of the reaction solution during the heating and stirring process to...

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Abstract

The invention discloses a double-perovskite metal oxide catalyst. The formula of the double-perovskite metal oxide catalyst is LaSrFeMo1-xCoxO6, wherein x is greater than or equal to 0.1 and less than or equal to 1. The invention discloses four methods, that is, a coprecipitation method, a gel-sol method, a reversed-phase microemulsion method and a hard template method in all to prepare a series of double-perovskite metal oxide catalysts. As nitrate, ammonium carbonate, citric acid, glucose and the like are taken as raw materials, the double-perovskite metal oxide catalyst is wide in raw material source, easy to prepare and low in cost; under conditions of specific reaction steps and process parameters, a complete double-perovskite crystal form is formed through specific high-temperature roasting, the whole preparation method is simple, and the yield is relatively high.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a double perovskite metal oxide catalyst and a preparation method thereof. Background technique [0002] Natural gas is called a new generation of "clean energy" due to its abundant reserves, low price, and low pollution. my country has abundant natural gas reserves, and the volume content of the main component methane often reaches 80-90% or higher. The structure of methane is stable, and its combustion requires a higher flame temperature than other hydrocarbons, and high-temperature combustion is likely to cause the formation of nitrogen oxides. Catalytic combustion of natural gas is a controllable reaction with low ignition temperature and complete combustion in excess air. It not only has high thermal efficiency, but also can effectively eliminate NOx and CO emissions. It has the advantages of energy saving and environmental protection, and can be applied to energy utilizat...

Claims

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Application Information

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IPC IPC(8): B01J23/83C10L3/00
Inventor 郑建东侯金松冯建华
Owner CHUZHOU UNIV
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