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Composite catalyst with hollow core-shell structure and preparation method thereof

A composite catalyst and core-shell structure technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of composite catalyst structure collapse and low utilization rate of CaO problem, to achieve the effect of easy control of synthesis conditions, increase of methane conversion rate and increase of H2 concentration

Pending Publication Date: 2022-04-01
TAIYUAN UNIV OF TECH
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Problems solved by technology

However, although the inert components in the core-shell structure catalysts reported so far have played a good supporting role, the utilization rate of CaO is not high because of its large proportion (about 60-80%) in the composite catalyst; although the adsorption The composite catalyst with the core component has better performance, but the adsorbed component will experience a change from CaO to CaCO during the reaction-regeneration cycle. 3 Then the cyclical changes of CaO can easily cause the collapse of the composite catalyst structure, and the so-called core-shell structure catalyst has also become a mixture of catalytic components, adsorption components and inert components.

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  • Composite catalyst with hollow core-shell structure and preparation method thereof
  • Composite catalyst with hollow core-shell structure and preparation method thereof
  • Composite catalyst with hollow core-shell structure and preparation method thereof

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preparation example Construction

[0033] The present invention also provides a method for preparing the hollow core-shell composite catalyst, comprising the following steps:

[0034] 1) mixing calcium salt, aluminum salt, citric acid and water to obtain a gel;

[0035]2) Drying, roasting, and carbonating the gel in sequence to obtain the carbonation adsorption component;

[0036] 3) mixing the carbonation adsorption component, ethanol, surfactant and silicon salt to obtain an emulsion, and sequentially hydrolyzing and suction filtering the emulsion to obtain the first filter residue;

[0037] 4) After mixing the first filter residue, surfactant, etchant and water, performing etching and suction filtration in sequence to obtain the second filter residue;

[0038] 5) The second filter residue, surfactant, nickel salt and water are mixed and reacted, and the filter residue obtained by the reaction is dried and calcined in sequence to obtain a composite catalyst with a hollow core-shell structure.

[0039] The p...

Embodiment 1

[0055] Dissolve calcium nitrate, aluminum nitrate and citric acid with a molar ratio of 1:0.03:5 in deionized water. The concentration of calcium ions in the resulting solution is 0.3mol / L. Stir the solution at 80°C for 7h until a gel is formed. , the resulting gel was dried at 125°C for 18h, and then calcined at 850°C for 1.5h to obtain the adsorption component, which was placed in CO 2 Atmosphere, carbonation treatment at 750°C for 5 hours to obtain the carbonation adsorption component.

[0056] The carbonation adsorption component was dispersed in ethanol (the mass concentration of ethanol was 94%), and ammonia water was added to adjust the pH value to 10 to obtain a mixed solution. Add cetyltrimethylammonium bromide and ethyl orthosilicate to the mixed solution and mix evenly to obtain an emulsion. In the emulsion, the concentration of cetyltrimethylammonium bromide is 2.5mmol / L , the concentration of calcium ions is 0.3mol / L, and the molar ratio of calcium ions and silic...

Embodiment 2

[0060] Dissolve calcium chloride, aluminum chloride and citric acid with a molar ratio of 1:0.1:1.5 in deionized water, and the concentration of calcium ions in the obtained solution is 1mol / L, and the solution is stirred at 60°C for 8h until a gel Gel, the resulting gel was dried at 100°C for 24h, and then calcined at 750°C for 3h to obtain the adsorption component, which was placed in CO 2 Atmosphere, carbonation treatment at 720°C for 4 hours to obtain carbonation adsorption components.

[0061] Disperse the carbonation adsorption component in ethanol (the mass concentration of ethanol is 96%), add ammonia water to adjust the pH value to 10, and obtain a mixed solution. Add cetyltrimethylammonium bromide and ethyl orthosilicate to the mixed solution and mix uniformly to obtain an emulsion. In the emulsion, the concentration of cetyltrimethylammonium bromide is 4mmol / L. The concentration of calcium ions is 0.5mol / L, and the molar ratio of calcium ions to silicon ions is 1:0...

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Abstract

The invention belongs to the technical field of catalysts. The invention provides a composite catalyst with a hollow core-shell structure. The composite catalyst is prepared from CaO, Ca3Al2O6, Ni and SiO2, in the composite catalyst, the molar ratio of Ca to Al to Ni to Si is 1: (0.01-0.5): (0.01-0.15): (0.01-0.15). The invention also provides a preparation method of the composite catalyst with the hollow core-shell structure. The composite catalyst with the hollow core-shell structure has catalysis and adsorption properties, the repeated volume expansion and shrinkage process of adsorption components in the reaction-regeneration cycle process is carried out in a SiO2 cavity, collapse of the structure of the composite catalyst cannot be caused, and the stability of the composite catalyst is improved; the methane conversion rate and the H2 concentration can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a composite catalyst with a hollow core-shell structure and a preparation method thereof. Background technique [0002] CO 2 Adsorption-enhanced steam reforming of methane for hydrogen production is a low-cost, high-purity H 2 and achieve CO 2 Effective technologies for reducing emissions. One of the core difficulties of this technology lies in the development of efficient catalyst and adsorbent materials. in CO 2 In the hydrogen production process of adsorption-enhanced methane steam reforming, compared with the pure mechanical mixing of catalyst and adsorbent, the composite catalyst with both catalytic and adsorption functions is closer to in-situ catalytic adsorption, and the mass transfer resistance is small, so it has the potential of high catalytic efficiency. Activity and CO 2 Adsorption performance, but the chemical stability of composites is more challenging than...

Claims

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Application Information

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IPC IPC(8): B01J23/78B01J23/755C01B3/40
CPCY02P20/52
Inventor 荆洁颖许凯刘璐冯杰李文英
Owner TAIYUAN UNIV OF TECH
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