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ZIF-8 material-based hydrogenation catalyst and synthetic method thereof

A technology of ZIF-8 and hydrogenation catalyst, which is applied in the direction of chemical instruments and methods, organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, etc., to achieve regular shape, simple and efficient synthesis method, metal The effect of high content

Inactive Publication Date: 2015-07-15
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydrogenation catalyst and its synthesis method based on ZIF-8 materials have not been reported yet.

Method used

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  • ZIF-8 material-based hydrogenation catalyst and synthetic method thereof
  • ZIF-8 material-based hydrogenation catalyst and synthetic method thereof
  • ZIF-8 material-based hydrogenation catalyst and synthetic method thereof

Examples

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Effect test

Embodiment 1

[0025] A kind of hydrogenation catalyst based on ZIF-8 material of the present invention and synthetic method thereof, specifically comprise the following steps:

[0026] Step 1: Zinc nitrate and 2-methylimidazole are dissolved in methanol, wherein the mass concentration of zinc nitrate is 5%, and the mass concentration of 2-methylimidazole is 5%, the surfactant is dissolved in the above solution, and the configuration A solution with a mass concentration of 2.5% was formed; after stirring and reacting at 20°C for 2 hours, it was allowed to stand for 12 hours to form a white turbid solution.

[0027] Step 2: Centrifuge the turbid solution obtained in Step 1 at a speed of 6000 rpm for 5 minutes; wash the precipitate obtained by centrifugation with methanol for 5 times, then dry the precipitate in an oven for 3 hours at a temperature of 150°C, the ZIF-8 carrier was obtained.

[0028] Step 3: Dissolve the transition metal salt in water and impregnate it on the ZIF-8 carrier desc...

Embodiment 2

[0034] A kind of hydrogenation catalyst based on ZIF-8 material of the present invention and synthetic method thereof, specifically comprise the following steps:

[0035] Step 1: Zinc nitrate and 2-methylimidazole are dissolved in methanol, wherein the mass concentration of zinc nitrate is 8%, and the mass concentration of 2-methylimidazole is 4%, the surfactant is dissolved in the above solution, and the configuration A solution with a mass concentration of 4% was formed; the reaction was stirred at 60°C for 4 hours and then allowed to stand for 18 hours to form a white turbid solution.

[0036] Step 2: Centrifuge the turbid solution obtained in Step 1 at a speed of 5000 rpm for 10 minutes; wash the precipitate obtained by centrifugation with methanol for 3 times, then dry the precipitate in an oven for 1 hour at a temperature of 200°C, the ZIF-8 carrier was obtained.

[0037] Step 3: Dissolve the transition metal salt in water and impregnate it on the ZIF-8 carrier described ...

Embodiment 3

[0043] A kind of hydrogenation catalyst based on ZIF-8 material of the present invention and synthetic method thereof, specifically comprise the following steps:

[0044] Step 1: Zinc nitrate and 2-methylimidazole are dissolved in methanol, wherein the mass concentration of zinc nitrate is 3%, and the mass concentration of 2-methylimidazole is 7%, the surfactant is dissolved in the above solution, and the configuration A solution with a mass concentration of 1% was formed; the reaction was stirred at 30°C for 3 hours and then left to stand for 15 hours to form a white turbid solution.

[0045] Step 2: Centrifuge the turbid solution obtained in Step 1 at a speed of 4000 rpm for 15 minutes; wash the precipitate obtained by centrifugation with methanol 4 times, then dry the precipitate in an oven for 5 hours at a temperature of 100°C, the ZIF-8 carrier was obtained.

[0046] Step 3: Dissolve the transition metal salt in water and impregnate it on the ZIF-8 carrier described in s...

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Abstract

The invention relates to a ZIF-8 material-based hydrogenation catalyst and a synthetic method thereof. The synthetic method particularly comprises the following steps: (1) dissolving zinc nitrate, 2-methylimidazole and a surface active agent with methanol, carrying out stirring reaction for 1-6h at 20-60 DEG C, and standing for 10-18h to obtain a turbid solution; (2) carrying out centrifugal treatment on the turbid solution, placing sediments in a drying oven to be dried to obtain a ZIF-8 carrier after washing with methanol; and (3) dissolving transition metal salt with water, dipping the ZIF-8 carrier into the dissolved transition metal salt, and roasting in a muffle furnace to obtain the ZIF-8 material based hydrogenation catalyst. The hydrogenation catalyst can be used for preparing biodiesel; the biodiesel preparation method comprises the steps of placing the ZIF-8 material based hydrogenation catalyst into a fixed bed reactor to be reduced, and introducing vegetable oil into the reactor for hydrocracking reaction at 300-400 DEG C under the conditions that the hydrogen partial pressure is 2-4MPa, the air speed is 0.9-3.6h<-1> so as to obtain the biodiesel finally. The catalytic efficiency of the synthesized ZIF-8 material based hydrogenation catalyst is improved by dozens of times compared with the catalytic efficiency of a traditional aluminum oxide catalyst.

Description

technical field [0001] The invention relates to a hydrogenation catalyst based on a ZIF-8 material and a synthesis method thereof, belonging to the technical field of catalyst synthesis. Background technique [0002] Zeolitic imidazolate frameworks (Zeolitic Imidazolate Frameworks, ZIFs) materials are a class of metal-organic framework materials that have been studied more in recent years. imidazole, benzimidazole) are connected to form a tetrahedral coordination polymer with a zeolite-like structure. ZIF-8 is the most representative one among ZIFs materials, with high specific surface area, good chemical stability and thermal stability. [0003] As for the synthesis method of ZIF-8, hydrothermal synthesis method and solvent evaporation method are mostly used. For example, in the patent CN103230777A, the inventor injected DMF into the polytetrafluoroethylene lining, added zinc nitrate and 2-methylimidazole to fully dissolve, and then put it into the reactor to carry out th...

Claims

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Application Information

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IPC IPC(8): B01J31/34C10G3/00
CPCY02P30/20
Inventor 刘静雷建都何静王璐莹邓立红陈盼饶昕李蓉初锦霞陈向丽
Owner BEIJING FORESTRY UNIVERSITY
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