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Ventilation air methane combustion catalyst and preparation method thereof

A methane combustion and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as complex processes, limited catalytic activity of catalysts, complex preparation methods, etc., to achieve cost reduction and meet thermal stability Requirements for sex and low temperature activity, and the effect of simple preparation methods

Inactive Publication Date: 2011-01-19
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are two key issues with the catalysts used in the catalytic methane combustion process: thermal stability and low-temperature activity
The metal-supported catalyst applied by Ji Shengfu and others has the advantages of low pressure drop and easy modularization, but the preparation method is relatively complicated
The catalyst process evaluation conditions disclosed by Ugling Jun and others are single, and the effect in the actual exhaust gas treatment process cannot be determined
However, the perovskite catalyst studied by Hu Ruisheng et al. has a small specific surface area, and the catalytic activity of the catalyst is limited to a certain extent. The low-temperature catalytic activity is not good, and it does not deviate from the traditional preparation process through the wet-dry gel process, and the process is still relatively complicated.

Method used

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  • Ventilation air methane combustion catalyst and preparation method thereof
  • Ventilation air methane combustion catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The composition of present embodiment catalyst is:

[0041] 1% active component, 30% coagent and 69% carrier, the active component is cobalt nitrate equivalent to 1% cobalt oxide, the coagent is cerium nitrate equivalent to 30% ceria, and the carrier It is 69% alumina, named VAM1.

[0042] The catalyst is prepared by the following method:

[0043] (1), 3.9g of cobalt nitrate hexahydrate (equivalent to 1g of cobalt oxide), 76g of cerium nitrate hexahydrate (equivalent to 30g of cerium dioxide) were dissolved in 100g of 5wt% citric acid aqueous solution to form a solution;

[0044] (2), immerse 69g of alumina in the aqueous solution prepared in step (1), and immerse at room temperature for 4 hours;

[0045] (3) Extrude the mixture in step (2), dry at 120°C for 1 hour, and calcinate at 600°C for 4 hours to obtain a strip catalyst.

Embodiment 2

[0047] The composition of present embodiment catalyst is:

[0048] 50% active component, 1% coagent and 49% carrier, the active component is cobalt acetate which is equivalent to 50% cobalt oxide content, and the coagent is nitric acid which is equivalent to 1% lanthanum trioxide content Lanthanum, the carrier is composed of 20% titanium oxide and 29% zirconium oxide, named VAM2.

[0049] The catalyst is prepared by the following method:

[0050] (1), 2.7 g of lanthanum nitrate hexahydrate (equivalent to 1 g of lanthanum trioxide) was dissolved in 50 g of citric acid aqueous solution with a concentration of 1 wt%, to form a solution;

[0051] (2) Dissolve 20g of titanium oxide and 29g of zirconium oxide in the aqueous solution prepared in step (1), immerse at room temperature for 3 hours, dry naturally, press into tablets, dry at 120°C for 2 hours, and bake at 500°C for 5 hours , that is, the catalyst precursor is obtained.

[0052] (3) Dissolve 166g of cobalt acetate tetra...

Embodiment 3

[0054] The composition of present embodiment catalyst is:

[0055] 40% active ingredient, 20% coagent and 40% carrier, the active component is manganese nitrate equivalent to 20% manganese dioxide, and the coagent is lanthanum nitrate equivalent to 20% lanthanum trioxide , the carrier is 20% magnesium oxide and 40% calcium oxide, named VAM3.

[0056] The catalyst is prepared by the following method:

[0057] (1) Fully mix 116g of manganese nitrate tetrahydrate (equivalent to 40g of manganese dioxide), 20g of magnesium oxide and 40g of calcium oxide.

[0058] (2) The mixture is rolled into a ball, dried at 120°C for 2 hours, and calcined at 500°C for 2 hours to make a catalyst precursor;

[0059] (3) Dissolve 54g of lanthanum nitrate hexahydrate (equivalent to 20g of dilanthanum trioxide) in 150g of citric acid aqueous solution with a concentration of 10wt% to form a solution. The catalyst precursor in step (2) was immersed in the solution, soaked at room temperature for 6 h...

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Abstract

The invention discloses a ventilation air methane combustion catalyst and a preparation method thereof. The catalyst consists of the following components in percentage by weight: 1 to 50 percent of active ingredient, 1 to 30 percent of active aid and the balance of porous carrier, wherein the active ingredient is one or two of oxides of manganese and cobalt or soluble salts of manganese and cobalt; the active aid is any one of cerium compounds or lanthanum compounds; and the porous carrier is one or more of aluminium oxide, titanium oxide, zirconium oxide, magnesium oxide, calcium oxide, silicon dioxide, aluminium silicate and magnesium silicate. The catalyst is applied to ventilation air methane combustion and has the advantages of simple preparation method, low cost, relatively low methane ignition point and complete combustion temperature, and the like.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a mine exhaust gas methane combustion catalyst and a preparation method thereof. Background technique [0002] Ventilation Air Methane (also known as mine ventilation, Ventilation Air Methane, referred to as VAM), refers to the gas carried by the wind after a large amount of ventilation in the coal mining process, and the air flow passes through the mining face and other places where the wind is used, and its methane concentration is lower than 0.75%. The amount of methane discharged into the atmosphere through exhaust air in my country is about 10-15 billion cubic meters per year, which is equivalent to 13-20 million tons of standard coal, and it is basically not used. Although the concentration of methane in exhaust gas is very low, the total amount is huge, accounting for about 81% of the total amount of methane emitted from coal mine gas in my country. Because ...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/34B01J23/889B01D53/86B01D53/72
Inventor 陈耀壮曾健廖炯郑珩马磊雷菊梅
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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