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

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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

Examples

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Example Embodiment

[0033] The present invention also provides a method of preparing a hollow core shell structure composite catalyst comprising the steps of:

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

[0035]2) The gel is sequentially dried, calcined, carbonated to obtain a carbonated adsorption component;

[0036] 3) Mix the carbonated adsorption component, ethanol, surfactant, and silicon salt to obtain emulsion, hydrolyzate the emulsion, to extract, to obtain a first filter residue;

[0037] 4) After mixing the first filter, the surfactant, the etchant, and water, and the filtration is filtered, and the second filter residue is obtained.

[0038] 5) After mixing the second filter, the surfactant, the nickel salt, and water, and the reflected filter residue was dried, calcined, and obtained the hollow nuclear shell structure composite catalyst.

[0039] Step 1) The calcium salt preferably comprises one or more of nitrate, calcium acetate, calcium sulfa...

Example Embodiment

[0054] Example 1

[0055] The molar ratio of 1: 0.03: 5 is dissolved in deionized water, and the concentration of calcium ions in the obtained solution is 0.3 mol / L, and the solution is stirred at 80 ° C for 7 h to form a gel. The resulting gel was dried at 125 ° C for 18 h, then the adsorption component was obtained at 850 ° C for 1.5 h, and the adsorption component was in CO. 2 The atmosphere was tested for 5 h at 750 ° C for 5 h to obtain a carbonated adsorption component.

[0056] The carbonated adsorption group was dispersed in ethanol (the mass concentration of ethanol) was added, and the ammonia water was added to 10 to obtain a mixture. Add hexadalkyltrimel bromide and orthodoxy ester mix well to the mixture, and the concentration of n-hexamethyltrimethylammonium bromide is 2.5 mmol / L in the emulsion, emulsion. The concentration of calcium ions is 0.3 mol / L, the molar ratio of calcium ions and silicon ions is 1: 0.02. The emulsion was hydrolyzed at 30 ° C for 5 h, an...

Example Embodiment

[0059] Example 2

[0060] The molar ratio of 1: 0.1: 1.5 was dissolved in deionized water, and the concentration of calcium ions in the obtained solution was 1 mol / L, and the solution was stirred at 60 ° C for 8 h to form condensation. Glue, the resulting gel was dried at 100 ° C for 24 h, then baked for 3 h at 750 ° C to obtain an adsorption component, and the adsorption component was in CO. 2 The atmosphere was tested for 4 h at 720 ° C for 4 h to obtain a carbonated adsorption component.

[0061] The carbonated adsorption group was dispersed in ethanol (the mass concentration of ethanol was 96%), and the ammonia water was added to 10 to obtain a mixture. The addition of hexadalkyltrimel bromine and orthodoxy ester is mixed into the mixture, and the concentration of n-hexamethyltrimethylammonium bromide is 4 mmol / L in emulsion, emulsion. The concentration of calcium ions was 0.5 mol / L, the molar ratio of calcium ions and silicon ions was 1: 0.07. The emulsion was hydrolyze...

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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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