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Ultrasonic-assisted prepared ultralow-concentration methane combustion catalyst and preparation method thereof

A methane combustion, ultra-low concentration technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. problems such as less load, to achieve the effects of short preparation cycle, simple preparation process, and improved catalytic activity and stability

Inactive Publication Date: 2015-01-28
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent CN103191733A has developed a 2 o 3 As the carrier, the noble metal Pd is used as the main catalytic active component, and the noble metal Pt, Ru, Ir, etc. Relatively complex and relatively expensive
[0007] Transition metal catalysts Cu, Mn, and Co are cheap and have good catalytic activity. However, due to the small mass transfer driving force during the impregnation and loading process, the active components are less loaded and the dispersion is low. The catalytic performance of the prepared catalyst decreases

Method used

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  • Ultrasonic-assisted prepared ultralow-concentration methane combustion catalyst and preparation method thereof
  • Ultrasonic-assisted prepared ultralow-concentration methane combustion catalyst and preparation method thereof
  • Ultrasonic-assisted prepared ultralow-concentration methane combustion catalyst and preparation method thereof

Examples

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Embodiment example 1

[0023] A preparation method for ultrasonically assisted preparation of an ultra-low concentration methane combustion catalyst, the method comprising the steps of:

[0024] (1) Add appropriate amount of Mg(NO 3 ) 2 Dissolved in deionized water, configured as 0.3mol / L Mg(NO 3 ) 2 solution. Then the granular γ-Al with a diameter of 120-150 mesh 2 o 3 impregnated into Mg(NO 3 ) 2 In the solution, stirred and impregnated with a magnetic stirrer for 5h, evaporated to dryness in a drying oven at 120°C, and roasted in a muffle furnace at 700°C for 8h to obtain a carrier γ-Al loaded with additive MgO 2 o 3 -MgO.

[0025] (2) Adding an appropriate amount of Cu(NO 3 ) 2 Dissolved in deionized water, prepared to a concentration of 0.3mol / L Cu(NO 3 ) 2 solution, the prepared carrier γ-Al 2 o 3 -MgO impregnated into Cu(NO 3 ) 2 In the solution, use a constant temperature water bath to keep the solution temperature at 20°C, and use an ultrasonic sonochemical treatment device...

Embodiment example 2

[0030] A preparation method for ultrasonically assisted preparation of an ultra-low concentration methane combustion catalyst, the method comprising the steps of:

[0031] (1) Add appropriate amount of Mg(NO 3 ) 2 Dissolved in deionized water, configured as 0.3mol / L Mg(NO 3 ) 2 solution. Then the granular γ-Al with a diameter of 120-150 mesh 2 o 3 impregnated into Mg(NO 3 ) 2 In the solution, stirred and impregnated with a magnetic stirrer for 5h, evaporated to dryness in a drying oven at 120°C, and roasted in a muffle furnace at 700°C for 8h to obtain a carrier γ-Al loaded with additive MgO 2 o 3 -MgO.

[0032] (2) Adding an appropriate amount of Cu(NO 3 ) 2 Dissolved in deionized water, prepared to a concentration of 0.3mol / L Cu(NO 3 ) 2 solution, the prepared carrier γ-Al 2 o 3 -MgO impregnated into Cu(NO 3 ) 2 In the solution, use a constant temperature water bath to keep the solution temperature at 30°C, and use an ultrasonic sonochemical treatment device...

Embodiment example 3

[0035] A preparation method for ultrasonically assisted preparation of an ultra-low concentration methane combustion catalyst, the method comprising the steps of:

[0036] (1) Add appropriate amount of Mg(NO 3 ) 2 Dissolved in deionized water, configured as 0.3mol / L Mg(NO 3 ) 2 solution. Then the particle size is 120 mesh γ-Al 2 o 3 impregnated into Mg(NO 3 ) 2 In the solution, stirred and impregnated with a magnetic stirrer for 5h, evaporated to dryness in a drying oven at 120°C, and roasted in a muffle furnace at 700°C for 8h to obtain a carrier γ-Al loaded with additive MgO 2 o 3 -MgO.

[0037] (2) Adding an appropriate amount of Cu(NO 3 ) 2 Dissolved in deionized water, prepared to a concentration of 0.4mol / L Cu(NO 3 ) 2 solution, the prepared carrier γ-Al 2 o 3 -MgO impregnated into Cu(NO 3 ) 2 In the solution, use a constant temperature water bath to keep the solution temperature at about 25°C, and use an ultrasonic sonochemical treatment device to assis...

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Abstract

The invention discloses an ultrasonic-assisted prepared ultralow-concentration methane combustion catalyst which adopts gamma-Al2O3-MgO as a carrier, wherein the surface of the carrier is loaded with an active ingredient CuO; in the active ingredient CuO, Cu accounts for 5%-10% of the catalyst in mass; compared with the catalyst prepared through adopting a common dipping method, the ultralow-concentration methane combustion catalyst has the following differences: an ultrasonic technology is led in in the loading process of the active ingredient with the ultrasonic wave frequency being 90-300 W, frequency being 20-25 KHZ, and time being 10-30 min, which can achieve an optimum effect; meanwhile, the invention further discloses a preparation method for the ultrasonic-assisted prepared ultralow-concentration methane combustion catalyst. By utilizing energy of ultrasonic waves, the active ingredient CuO is modified and optimized in the structure and functions. The ultrasonic-assisted prepared ultralow-concentration methane combustion catalyst and the preparation method thereof have the following advantages: the preparation technology for the catalyst is simple, the preparation period is short, and when the catalyst subjected to ultrasonic modification is used for catalytic combustion of ultralow-concentration methane, catalytic activity and stability of the catalyst can be effectively improved.

Description

technical field [0001] The invention relates to a method for preparing a high-efficiency catalyst for catalytic combustion of ultra-low concentration methane, and belongs to the technical field of catalytic combustion and high-efficiency catalyst preparation. Background technique [0002] A large amount of low-concentration methane (such as coal mine exhaust air) will be produced in the process of coal production, and its concentration is even lower than 1%. It cannot be directly ignited, and it will cause waste of resources and greenhouse effect when discharged into the atmosphere. At present, it is mainly used in the way of catalytic combustion. Catalysts suitable for the catalytic combustion of ultra-low concentration methane should have the characteristics of high catalytic activity, high temperature resistance, anti-sintering and strong stability. [0003] Noble metal catalysts (Pt, Au and Rh, etc.) have been widely used due to their high catalytic activity and good se...

Claims

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Application Information

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IPC IPC(8): B01J23/72
Inventor 陈艳容杨仲卿樊湖李浩杰杨政
Owner CHONGQING UNIV
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