Heat-storing catalytic composite functional material and preparation method thereof

A composite function, heat storage technology, applied in heat exchange materials, chemical instruments and methods, catalyst carriers, etc., to solve the effect of uneven heating

Inactive Publication Date: 2011-08-31
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although improving the physical properties of the catalyst support (such as specific surface area, pore structure, and bulk density, etc.) can alleviate this hazard to a certain extent, it cannot fundamentally solve the problem.

Method used

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  • Heat-storing catalytic composite functional material and preparation method thereof
  • Heat-storing catalytic composite functional material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The preparation process of the heat storage-catalysis composite functional material of the present invention is as follows: the metal salt microspheres prepared in advance are dispersed in silicone oil (C 2 Cl 4 , insoluble in water and denser than water), and form a suspension under the action of a magnetic stirrer. Configure a certain concentration of nitrate solution (aluminum nitrate, titanium nitrate, magnesium nitrate or zirconium nitrate, etc.), and join it in the above-mentioned tetrachlorethylene suspension (the volume ratio of aqueous solution and tetrachlorethylene suspension is 1: 1), let it stand for 10-30 minutes to make the layered liquid level clearly visible. The upper aqueous solution is stirred counterclockwise at a constant speed with an electric stirrer, and the lower layer of tetrachlorethylene suspension is stirred clockwise with a magnetic stirrer. After being stable for 2-10 minutes, drop ammonia solution to precipitate the upper layer of nitra...

Embodiment 1

[0025] 1) Implementation conditions

[0026] 0.1 μm Li 2 CO 3 Microspheres and tetrachlorethylene are configured to form a 10g / L suspension, and 0.2mol / L aluminum nitrate solution is added to form a layered solution. Al 2 o 3 / Li 2 CO 3 Composite functional materials. This material is used as a catalyst carrier in the partial oxidation of methane process, loaded with 10% Ni catalyst, with high-purity methane containing helium (used as diluent gas) and oxygen [V(CH 4 ): V(O 2 ):V(He)=40:20:40) as the raw material gas, the reaction temperature is 800°C, and the reaction space velocity is 6000mL·g -1 h -1 .

[0027] 2) Implementation results

[0028] The sintered strength of the finished product is higher. The particle size range of the obtained composite material is 2-10μm, the thermal expansion coefficient is 0.35, and the sintered density is 2.23g / cm 3 , the porosity is 14-23%, the thermal conductivity is 35.8w / m·k, and the heat storage density at 700-750℃ is 960....

Embodiment 2

[0030] 1) Implementation conditions

[0031] 10μm NaCl microspheres and tetrachlorethylene are configured to form a 50g / L suspension, and 1mol / L titanium nitrate solution is added to form a layered solution. Precipitate with ammonia water, stand still, filter, and roast in air atmosphere at 800°C for 8 hours to obtain TiO 2 / NaCl composite functional material. The material was used as a catalyst carrier for methane catalytic combustion, loaded with 15% Fe 2 o 3 Catalyst, with N 2 (used as diluent) of high-purity methane and oxygen [V(CH 4 ): V(O 2 ): V(N 2 )=10:40:50) mixed gas as raw material gas, the reaction temperature is 300-800°C, and the reaction space velocity is 1200mL·g -1 h -1 .

[0032] 2) Implementation results

[0033] The sintered strength of the finished product is higher. The particle size range of the obtained composite material is 21-78μm, the thermal expansion coefficient is 0.31, and the sintered density is 2.56g / cm 3, the porosity is 12-17%, t...

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Abstract

The invention relates to a catalyst carrier with a heat-storing function and a preparation method thereof, belonging to the field of application catalysis. The heat-storing catalytic composite functional material is of a nuclear shell structure, wherein an inorganic material such as aluminum oxide, titanium oxide, magnesium oxide or zirconium oxide is used as a shell layer for tightly coating a metal salt used as a phase-change material, such as Na2CO3, K2CO3, Li2CO3, NaCl, KCl or LiCl or mixture thereof as a nuclear layer. The heat-storing catalytic composite material has the textural characteristics of a traditional catalyst carrier on pattern, specific area, crystallographic form and the like, and the phase-change material metal salt of the nuclear layer and the catalyst inorganic material of the shell layer are combined to form an enhanced body.

Description

technical field [0001] The invention relates to a catalyst carrier with heat storage function and a preparation method thereof, belonging to the field of applied catalysis. Background technique [0002] In many chemical reactions involving catalysts, severe sintering of catalysts caused by local overheating (hot spots) caused by exothermic reaction or uneven heating is an important reason for catalyst deactivation. Although improving the physical properties of the catalyst support (such as specific surface area, pore structure, and bulk density, etc.) can alleviate this hazard to a certain extent, it cannot fundamentally solve the problem. Thermal storage technology is a common means to reconcile the mismatch between thermal energy supply and demand in time and space. In particular, phase change heat storage technology has been widely used in many fields such as solar energy storage and thermal management of electronic devices due to its advantages of high heat storage dens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J27/236B01J27/135B01J27/125C09K5/06
Inventor 李孔斋王华魏永刚祝星宴冬霞
Owner KUNMING UNIV OF SCI & TECH
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