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Preparation method of hydrotalcite-like nanosheets

A technology of hydrotalcite and nanosheets, applied in chemical instruments and methods, copper compounds, zinc compounds, etc., can solve problems such as high cost, low cost, and environmental pollution, and achieve low cost, short reaction time, and small environmental hazards Effect

Active Publication Date: 2017-10-17
SHANXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a hydrothermal preparation method of hydrotalcite-like nano-sheets for the preparation of hydrotalcite-like nano-sheets in the prior art that is peeled off in an organic solvent, which is easy to cause environmental pollution and high cost. No organic solvent is used, the cost is low, and the prepared hydrotalcite-like nanosheets can realize the full utilization of both sides of the catalyst layer in the catalytic reaction

Method used

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  • Preparation method of hydrotalcite-like nanosheets
  • Preparation method of hydrotalcite-like nanosheets
  • Preparation method of hydrotalcite-like nanosheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 (taking Cu / Al class hydrotalcite nanosheet as example)

[0026] 1) Preparation of intercalated hydrotalcites

[0027] Weigh 0.28g of lauryl imidazoline into 40mL deCO 2 Water is made into solution, under normal temperature, with 50mL concentration be the metal nitrate mixed solution of 0.5mol / L (the molar ratio of each substance is Cu:Al=1:0.25) and the sodium hydroxide solution that concentration is 0.5mol / L, and Flow Join Through N 2 In the octyl betaine aqueous solution, stir vigorously, control pH=8 or so. After the dropwise addition of the mixed salt solution is completed, stop the dropwise addition of the lye. After continuing to stir vigorously for 0.5h, put it into a hydrothermal kettle, and conduct hydrothermal treatment at 75°C for 24h. After the reaction was complete, the product was centrifuged to remove CO 2 Washing with water several times to neutrality, suction filtration, and vacuum drying to obtain the intercalation hydrotalcite-like m...

Embodiment 2

[0030] Embodiment 2 (taking Mg / Al class hydrotalcite nanosheet as example)

[0031] 1) Preparation of intercalated hydrotalcites

[0032] Weigh 0.30g of octyl betaine into 80mL of CO 2 Water is made into solution, under normal temperature, with 100mL concentration be the metal nitrate mixed solution of 0.1mol / L (the molar ratio of each substance is Mg:Al=3:2) and the sodium hydroxide solution that concentration is 0.1mol / L, and Flow Join Through N 2 In the aqueous solution of octyl betaine, stir vigorously, and control the pH=10 or so. After the dropwise addition of the mixed salt solution is completed, stop the dropwise addition of the lye. After continuing to stir vigorously for 1 hour, put it into a hydrothermal kettle at 85°C for 20 hours for hydrothermal treatment. After the reaction was complete, the product was centrifuged to remove CO 2 Washing with water several times to neutrality, suction filtration, and vacuum drying to obtain the intercalation hydrotalcite-li...

Embodiment 3

[0035] Embodiment 3 (taking Zn / Al class hydrotalcite nanosheet as example)

[0036] 1) Preparation of intercalated hydrotalcites

[0037] Weigh 6.91g of dodecylalanine into 120mL deCO 2 Water is made into a solution, and at normal temperature, 150mL of a metal nitrate mixed solution with a concentration of 1mol / L (the ratio of each substance is Zn:Al=7:3) and a sodium hydroxide solution with a concentration of 0.5mol / L are added in parallel. Pass N 2 Dodecylalanine aqueous solution, stirring vigorously, control pH=11 or so. After the dropwise addition of the mixed salt solution is completed, stop the dropwise addition of the lye. After continuing to stir vigorously for 1.5h, put it into a hydrothermal kettle, and conduct hydrothermal treatment at 95°C for 18h. After the reaction was complete, the product was centrifuged to remove CO 2 Washing with water several times to neutrality, suction filtration, and vacuum drying to obtain the intercalation hydrotalcite-like materia...

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Abstract

The invention provides a preparation method of a hydrotalcite-like compound nanosheet. The preparation method of the hydrotalcite-like compound nanosheet comprises the following steps: firstly adding mixed metal salt and sodium hydroxide into an ampholytic surfactant solution in parallel flow, and after reaction is finished, putting into a hydrothermal kettle for carrying out hydrothermal treatment, so that an intercalation hydrotalcite-like compound is prepared; and then putting the intercalation hydrotalcite-like compound into an acid solution, so that the hydrotalcite-like compound nanosheet is obtained. The preparation method of the hydrotalcite-like compound nanosheet is simple in operation and applicable to large-scale production. The preparation method of the hydrotalcite-like compound nanosheet adopts no other organic matters except the ampholytic surfactant and organic acid, and the adopted solvents are in an aqueous phase and do less harm to the environment; meanwhile, the operation is simple, and the cost is low.

Description

technical field [0001] The invention relates to a hydrotalcite-like material, in particular to a hydrothermal preparation method of a hydrotalcite-like nanosheet. Background technique [0002] Hydrotalcite-like (HTlc), also known as layered double hydroxides (LDHs), is a class of highly ordered two-dimensional anionic clay materials, which have a regular octahedral structure, and adjacent octahedrons form layers by sharing edges. The layers are stacked on top of each other, and the layers are associated through hydrogen bonds; due to the exchangeability of its anions and the compatibility of the cations of the laminates, various hydrotalcite-like compounds with different compositions can be synthesized. Composite oxides prepared by roasting hydrotalcite-like compounds generally have large specific surface area, high thermal stability, uniform distribution of active components, can inhibit sintering, and have good stability. All of them exhibit excellent catalytic performanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G3/00C01G9/00C01F7/00
CPCC01F7/00C01G3/00C01G9/00C01P2002/72C01P2004/36C01P2004/64
Inventor 张越白雪丽赵永祥刘茜张乘风
Owner SHANXI UNIV