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Phosphorus-doped boron nitride acid-base catalyst and preparation method and application thereof

A boron nitride acid-base and phosphorus doping technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, cyanide reaction preparation, etc. Complicated process and other issues, to achieve the effect of excellent acid-base catalytic performance, cheap raw materials, stable physical and chemical properties

Active Publication Date: 2018-07-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the acid-base catalysts prepared by the above method generally have the problems of complex preparation process and partial neutralization of acid-base sites, resulting in low acid-base strength.
[0010] In addition, although the prior art also has reports on the preparation of phosphorus-doped boron nitride nanomaterials using red phosphorus as a phosphorus source, the prepared phosphorus-doped boron nitride nanomaterials have a large specific surface area and can be used as a substrate for loading metal nanoparticles. But it does not have acid-base active sites, so it cannot be used as an acid-base catalyst

Method used

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  • Phosphorus-doped boron nitride acid-base catalyst and preparation method and application thereof
  • Phosphorus-doped boron nitride acid-base catalyst and preparation method and application thereof
  • Phosphorus-doped boron nitride acid-base catalyst and preparation method and application thereof

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Effect test

Embodiment 1

[0059] (a) Add 9.31g of urea, 0.4g of boric acid and 1.5g of phosphorous acid (the molar ratio of boron to phosphorus is 1:1.4) into 20ml of distilled water, stir until the materials are dissolved to obtain a solution, and then stir the solution at 65°C Recrystallize until there is no obvious moisture, and place the stirred recrystallized product in a vacuum drying oven at 50° C. for 8 hours.

[0060] (b) Place the dried recrystallized product in a corundum ark and then place it in a tube furnace, and feed N at a flow rate of 60ml / min 2 , heated up to 800°C at a rate of 5°C / min, kept roasting for 3h, and then in N 2 The BNP acid-base catalyst is obtained by lowering the temperature to room temperature.

Embodiment 2

[0062] (a) Add 9.31g of urea, 0.4g of boric acid and 2.21g of phosphorous acid (the molar ratio of boron to phosphorus is 1:2.1) into 20ml of distilled water, stir until the materials are dissolved to obtain a solution, and then stir the solution at 65°C Recrystallize until there is no obvious moisture, and place the stirred recrystallized product in a vacuum drying oven at 50° C. for 8 hours.

[0063] (b) Place the dried recrystallized product in a corundum ark and then place it in a tube furnace, and feed N at a flow rate of 60ml / min 2 , heated up to 800°C at a rate of 5°C / min, kept roasting for 3h, and then in N 2 The BNP acid-base catalyst is obtained by lowering the temperature to room temperature.

Embodiment 3

[0065] (a) Add 9.31g of urea, 0.4g of boric acid and 1.66g of hydroxyethylidene diphosphonic acid (the molar ratio of boron element to phosphorus element is 1:2.1), add 20ml of distilled water, stir until the material dissolves to obtain a solution, and then dissolve the solution Stir and recrystallize at 65°C until there is no obvious moisture, and place the stirred recrystallized product in a vacuum drying oven at 50°C for 8 hours.

[0066] (b) Place the dried recrystallized product in a corundum ark and then place it in a tube furnace, and feed N at a flow rate of 60ml / min 2 , heated up to 800°C at a rate of 5°C / min, kept roasting for 3h, and then in N 2 The BNP acid-base catalyst is obtained by lowering the temperature to room temperature.

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Abstract

The invention discloses a phosphorus-doped boron nitride acid-base catalyst and a preparation method and application thereof. The preparation method includes the steps that a solution containing a phosphorus source, a boron source and a nitrogen source is recrystallized to obtain a recrystallization product, the recrystallization product is dried and then roasted at 700-850 DEG C in an inert atmosphere, and after roasting is completed, the phosphorus-doped boron nitride acid-base catalyst is obtained. The prepared phosphorus-doped boron nitride acid-base catalyst is a bifunctional catalyst which has a nanosheet structure with the thickness of 0.8-2 nm and also has acid-base active sites. The catalyst is a non-metal solid acid-base catalyst, has the advantages of being high in acid-base property, good in stability and easy to prepare, and shows excellent activity in one-pot cascade reaction under acid-base catalysis.

Description

technical field [0001] The invention relates to a phosphorus-doped boron nitride acid-base catalyst, a preparation method and application thereof. It belongs to the field of heterogeneous catalysis application and nanomaterial synthesis. Background technique [0002] Solid acid-base catalysts are the most widely used catalysts in the petroleum and chemical industries. Most reactions in the petroleum and chemical industry, such as cracking, alkylation, oligomerization, isomerization, disproportionation, etc., use acid-base catalysts. Acid-base catalyzed reactions have always attracted people's attention, and more than 300 kinds of acid-base catalysts have been put into use in the past 40 years. [0003] The series reaction catalyzed by acid and base separately is an important class of reaction in fine chemical industry and organic synthesis. For example: acid-catalyzed decomposition of benzaldehyde dimethyl acetal to obtain benzaldehyde, and then base-catalyzed reaction be...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08C07C255/33C07C253/16
CPCC07C253/16B01J27/24B01J37/082B01J35/23C07C255/33
Inventor 周永华赵君林百宁朱一帆
Owner CENT SOUTH UNIV
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