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Monolithic catalyst applied to ultralow-concentration methane combustion and preparation method thereof

A monolithic catalyst, methane combustion technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Easy to fall off and other problems, to achieve the effect of complete crystal form, simple preparation process and less precious metal consumption

Inactive Publication Date: 2018-04-13
秦皇岛天大环保研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the sol concentration is too thick, it is easy to block the pores of the honeycomb ceramic carrier; if the sol concentration is too low, the adhesion is not good, causing the coating to fall off easily; the loading method of precious metals also affects the formation and arrangement of crystal forms, thus affecting the activity of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A monolithic catalyst for ultra-low concentration methane combustion, including carrier, coating and noble metal, the carrier is cordierite honeycomb ceramics, and its specific surface area is 0.81m 2 / g, pore size 3mm; the coating is γ-Al 2 o 3 transitional coating, Al in the transitional coating 2 o 3 The mass percentage of Pd is 5%-10%, the noble metal is palladium Pd, and the mass percentage of Pd is 2%.

[0019] A method for preparing a monolithic catalyst for ultra-low concentration methane combustion is as follows:

[0020] Step 1: Wash the cordierite honeycomb ceramics with deionized water to remove the dust on its surface and pores, dry it naturally, put it in an oven at 110°C for 2 hours, and place the dried cordierite honeycomb ceramics in a container Soak in a beaker with 10% nitric acid solution until it is completely immersed, then seal the beaker with tin foil, let it stand at room temperature for 2 hours, take out the cordierite honeycomb ceramics, c...

Embodiment 2

[0026] A monolithic catalyst for ultra-low concentration methane combustion, including carrier, coating and noble metal, the carrier is cordierite honeycomb ceramics, and its specific surface area is 0.81m 2 / g, pore size 3mm; the coating is γ-Al 2 o 3 transitional coating, Al in the transitional coating 2 o 3 The mass percentage of Pd is 5%-10%, and the precious metal is palladium Pd, and the mass percentage of Pd is 0.5%; its preparation method is as follows:

[0027] Step 1: the same as the method in Embodiment 1;

[0028] Step 2: Put 8g of pseudoboehmite dry rubber powder in a beaker, add 100ml of deionized water, then adjust it with 3.5ml of nitric acid, adjust the pH value to 3.5, and stir with a glass rod for 15 minutes to obtain aluminum sol, then add 1ml of polyethylene glycol to the aluminum sol, then place the beaker on a magnetic stirrer, set the temperature at 20°C, stir at high speed for 2 hours, and after standing still, get γ-Al 2 o 3 Sol, its colloidal s...

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PUM

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Abstract

The invention relates to a catalyst, and specifically relates to a monolithic catalyst applied to ultralow-concentration methane combustion and a preparation method thereof. The monolithic catalyst comprises a carrier, a coating and heavy metal, wherein the carrier is monolith cordierite ceramic and is 0.81m<2> / g in specific surface area and 3mm in diameter; the coating is a gamma-Al2O3 transitioncoating which contains 5-10% by mass of Al2O3; the heavy metal is Pd on the mass percent of 0.1-2%. The preparation method of the catalyst is simple; the methane combustion temperature can be decreased to be 450-550 DEG C, and the conversion rate is more than 90%; in addition, the gamma-Al2O3 coating prepared by the method is high in adhering performance, hard to peel off, smooth on the monolithcordierite ceramic and good in effect of loading Pd.

Description

technical field [0001] The invention relates to a catalyst, in particular to a monolithic catalyst for ultra-low concentration methane combustion and a preparation method thereof. Background technique [0002] Coal mine exhaust gas is coal mine gas with a methane concentration lower than 0.75%. In the process of coal production, a large amount of coal mine exhaust gas will be removed. However, due to the low concentration of methane in coal mine exhaust gas, it is very difficult to collect and utilize it. For a long time, most Without taking any measures, the lack of wind in coal mines is directly discharged into the atmosphere, which not only causes the greenhouse effect, but also causes a lot of waste of energy. [0003] In recent years, with the requirements of the national energy conservation and emission reduction policy, coal mine ventilation has been better dealt with. Its main treatment technology is thermal countercurrent catalytic combustion technology. However, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44
CPCB01J23/44B01J35/56
Inventor 和娴娴栗勇田王雪娇郭清张兆祥
Owner 秦皇岛天大环保研究院有限公司