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Co3O4-based heat storage type catalyst, and preparation method and application thereof in catalyzing methane combustion

A catalyst and heat storage technology, used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of flying temperature and hot spots, and reduce energy utilization efficiency. , affecting the system economy and other issues, to achieve the effect of improving the thermal environment of the bed, improving the combustion and heating efficiency, and excellent catalytic effect

Inactive Publication Date: 2020-05-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of heat storage method that uses the heat capacity characteristics of materials to store heat by increasing the temperature has no control over the temperature and hot spots of the catalyst bed.
On the other hand, the heat storage medium and the catalyst in the catalytic countercurrent reactor system exist in isolation, and the heat is released and taken away by the gas. There is heat exchange to the heat storage medium, and the heat storage effect has a significant lag compared to the temperature rise of the reactor. , the depth of the reactor must be extended to achieve effective heat storage, which not only affects the economy of the system, but also causes a certain amount of heat loss, reducing energy utilization efficiency

Method used

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  • Co3O4-based heat storage type catalyst, and preparation method and application thereof in catalyzing methane combustion
  • Co3O4-based heat storage type catalyst, and preparation method and application thereof in catalyzing methane combustion
  • Co3O4-based heat storage type catalyst, and preparation method and application thereof in catalyzing methane combustion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: Co 3 o 4 based regenerative catalysts (see figure 1 ), the active component is Co 3 o 4 , the carrier is a core-shell structure SiAl@Al 2 o 3 Phase change heat storage material, based on the mass percentage of the catalyst, the active component accounts for 10%, and the core-shell structure carrier SiAl@Al 2 o 3 90%;

[0045] co 3 o 4 The preparation method of base regenerative catalyst, concrete steps are as follows:

[0046] (1) SiAl@Al 2 o 3 The composite heat storage material is ultrasonically dispersed into the cobalt nitrate solution to obtain a mixed solution A; the concentration of the cobalt nitrate solution is 0.05mol / L, the ultrasonic power is 100W, and the ultrasonic treatment time is 120min;

[0047] (2) Under the condition of a stirring rate of 200 r / min, add the sodium carbonate solution dropwise to the mixed solution A in step (1) to react until the pH value of the system is 9.0, and continue stirring for 120 minutes to obtain the ...

Embodiment 2

[0049] Example 2: Co 3 o 4 based regenerative catalysts (see figure 1 ), the active component is Co 3 o 4 , the carrier is a core-shell structure SiAl@Al 2 o 3 Phase change heat storage material, based on the mass percentage of the catalyst, the active component accounts for 30%, and the core-shell structure carrier SiAl@Al 2 o 3 70%;

[0050] co 3 o 4 The preparation method of base regenerative catalyst, concrete steps are as follows:

[0051] (1) SiAl@Al 2 o 3 The composite heat storage material was ultrasonically dispersed into the cobalt nitrate solution to obtain a mixed solution A; the concentration of the cobalt nitrate solution was 0.1 mol / L, the ultrasonic power was 100W, and the ultrasonic treatment time was 120min;

[0052] (2) At a stirring rate of 300 r / min, add the sodium carbonate solution dropwise to the mixed solution A in step (1) to react until the pH value of the system is 10.5, and continue stirring for 130 min to obtain the mixed solution B; ...

Embodiment 3

[0054] Example 3: Co 3 o 4 based regenerative catalysts (see figure 1 ), the active component is Co 3 o 4 , the carrier is a core-shell structure SiAl@Al 2 o 3 Phase change heat storage material, based on the mass percentage of the catalyst, the active component accounts for 50%, and the core-shell structure carrier SiAl@Al 2 o 3 50%;

[0055] co 3 o 4 The preparation method of base regenerative catalyst, concrete steps are as follows:

[0056] (1) SiAl@Al 2 o 3 The composite heat storage material is ultrasonically dispersed into the cobalt nitrate solution to obtain a mixed solution A; the concentration of the cobalt nitrate solution is 0.2mol / L, the ultrasonic power is 100W, and the ultrasonic treatment time is 120min;

[0057] (2) Under the condition of stirring rate of 400r / min, add the sodium carbonate solution dropwise to the mixed solution A in step (1) to react until the pH value of the system is 10.0, and continue stirring for 150 minutes to obtain the mix...

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Abstract

The invention relates to a Co3O4-based heat storage type catalyst, and a preparation method and application thereof in catalyzing methane combustion, and belongs to the technical field of methane combustion catalysts. According to the Co3O4-based heat storage type catalyst, an active component is Co3O4, a carrier is a core-shell structure SiAl@Al2O3 or SiCu@Al2O3 phase change heat storage material, and the active component accounts for 10-90% by mass of the catalyst. Heat storage is completed according to the principle that latent heat of phase change is absorbed or released in the phase change process of the latent heat storage material; the characteristics of high heat storage density and stable temperature during phase change are realized, and the heat storage type catalyst for catalyzing methane combustion is prepared; phase change heat storage is applied to low-concentration methane catalytic combustion, so that the whole catalyst bed layer heat exchanger is endowed with the function, the bed layer heat environment is improved, the operation space of the self-heating operation and heat supply link of the system is expanded, and the combustion and heat supply efficiency is improved.

Description

technical field [0001] The present invention relates to a Co 3 o 4 The invention relates to a heat-storage-based catalyst, a preparation method thereof, and an application in catalytic methane combustion, belonging to the technical field of methane combustion catalysts. Background technique [0002] Coal mine exhaust air (commonly known as gas, a kind of unconventional natural gas with methane as the main component and adsorbed in coal seams) is used as fuel to realize high-efficiency thermal energy conversion of low-grade methane through catalytic combustion, which is a method that can realize large-scale utilization . In conventional combustion technology, the flammable range of methane is 5-15%. When the concentration of methane in the air is lower than 5%, it cannot be ignited or maintained for combustion unless the ambient temperature exceeds 1000°C. However, due to the low concentration of methane, its reaction heat It is difficult to maintain such high temperatures...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75F23G7/07
CPCB01J23/002B01J23/75F23G7/07F23G2209/142B01J35/396
Inventor 李孔斋李丹阳徐瑞东王华田梦爽
Owner KUNMING UNIV OF SCI & TECH
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