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Composite catalyst, preparation and application thereof

A composite catalyst and reaction technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of easy deactivation of catalysts, decreased catalyst activity, and failure to adapt to cycles Economic requirements and other issues, to achieve the effect of avoiding difficult operation, narrow particle size distribution, and meeting the requirements of catalyst activity and service life

Inactive Publication Date: 2010-09-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst in the adsorption-enhanced methane steam reforming hydrogen production process is easily deactivated, and the catalyst activity begins to decline after several cycles, which cannot meet the circular economy requirements of industrial scale production

Method used

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  • Composite catalyst, preparation and application thereof
  • Composite catalyst, preparation and application thereof
  • Composite catalyst, preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Nano Zr(OH) 4 Preparation of hydrosols

[0078] First prepare the molar concentration of about 0.20mol / L ZrOCl 2 Aqueous solution, under the condition of continuous stirring, 25% ammonia water is used as precipitating agent, the ZrOCl that will prepare 2 The aqueous solution is added dropwise into the precipitating agent while controlling the pH value of the solution to be about 8-11. After the dropwise addition, continue to stir for 0.5 hours, then leave it to age for 3 hours to obtain Zr(OH) 4 Hydrosol. Zr(OH) 4 The hydrosol is washed repeatedly with deionized water until there is basically no chloride ion, and Zr(OH) 4 Hydrogel, filtered by suction, set aside.

[0079] The resulting Zr(OH) 4 Nano-ZrO obtained after hydrogel drying 2 Characterized by transmission electron microscopy, as figure 1 Shown, ZrO 2 The particle size is 2-20nm.

[0080] Composite catalyst preparation

[0081] Add 60g nano-calcium carbonate in the beaker, stir after adding deionize...

Embodiment 2

[0099] Composite catalyst preparation

[0100] Take 10.47g ZrOCl 2 ·8H 2 The molar concentration of O is about 0.20mol / L ZrOCl 2 Aqueous solution, the method described in embodiment 1 makes Zr(OH) 4 Hydrogel, then add 60.00g nano calcium carbonate in the beaker, stir after adding deionized water, the Zr(OH) that will make 4 The hydrogel is added to the nano-calcium carbonate, and at the same time, 260.00 g of aluminum sol with a solid content of 10% is added, mixed evenly, dried, extruded, and calcined into granules. Finally, 49.57g of nickel nitrate hexahydrate solution was added dropwise to the above shaped particles by equal volume impregnation method, impregnated at room temperature for 36 hours, filtered, dried, calcined at 500°C for 3 hours, cooled to room temperature for later use. The prepared composite catalyst ZrO 2 The mass content is 4%. The catalyst is designated as C-2.

[0101] Application of Composite Catalysts in Carbon Dioxide Reactive Adsorption Enhan...

Embodiment 3

[0104] Composite catalyst preparation

[0105] Take 20.94g ZrOCl 2 ·8H 2 The molar concentration of O is about 0.20mol / L ZrOCl 2 Aqueous solution, the method described in embodiment 1 makes Zr(OH) 4 Hydrogel, then add 60.00g nano calcium carbonate in the beaker, stir after adding deionized water, the Zr(OH) that will make 4 The hydrogel is added to the nano-calcium carbonate, and at the same time, 220.00 g of aluminum sol with a solid content of 1% is added, mixed evenly, dried, extruded, and calcined into granules. Finally, 49.57g of nickel nitrate hexahydrate solution was added dropwise to the above shaped particles by equal volume impregnation method, impregnated at room temperature for 72 hours, filtered, dried, calcined at 500°C for 3 hours, cooled to room temperature for later use. The prepared composite catalyst ZrO 2 The mass content is 8%. The catalyst is designated as C-3.

[0106] Application of Composite Catalysts in Carbon Dioxide Reactive Adsorption Enhanc...

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Abstract

The invention discloses a composite catalyst, a preparation method and application thereof. The composite catalyst is used for absorbing and strengthening methane steam in a reaction for reforming and manufacturing hydrogen. The composite catalyst is prepared by compounding CaO using nanometer calcium carbonate as a precursor, active nickel component using nickel nitrate as a precursor, nano ZrO2 using zirconium oxychloride as a precursor, and an alumina carrier; the mol ratio of CaO: Al2O3: NiO: ZrO2 is 1: (0.05 to 2.0): (0.05 to 3.0): (0.005 to 1.0). The composite catalyst has a catalytic function and an absorbing function of carbon dioxide, enhances stability, prolongs service life, and can be recycled 20 times or above.

Description

technical field [0001] The invention relates to the technical fields of chemical industry and energy, in particular to a composite catalyst for hydrogen production by reaction-adsorption enhanced steam reforming of methane and its preparation method and application. Background technique [0002] Hydrogen is mainly used for catalytic cracking in oil refining industry, ammonia synthesis in chemical industry, metallurgy and future hydrogen energy industry. Steam methane reforming (SMR for short) is a relatively mature and widely used hydrogen production method in industry, and 70% of the hydrogen in the world is produced by this method. The chemical reaction formula for steam reforming of methane to produce hydrogen is: [0003] ΔH 298 =206.2k J / mol (1) [0004] ΔH 298 =-41.1k J / mol (2) [0005] Both the steam reforming reaction (1) and the carbon monoxide shift reaction (2) are reversible reactions, and the steam reforming reaction is a strong endothermic reaction, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78C01B3/40
CPCY02P20/52
Inventor 吴素芳王璐璐
Owner ZHEJIANG UNIV
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