Preparation method and propane oxydehydrogenation application of rodlike hexagonal boron nitride foam

A technology of hexagonal boron nitride and foam, which is applied in the fields of material science and technology and petrochemical industry, and can solve problems such as affecting efficiency, difficult to control catalytic reaction, and large pressure drop

Active Publication Date: 2020-01-10
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when it is used as an oxidative dehydrogenation catalyst, it is often in a powder state, and it is easy to cause a large pressure drop in a plug flow reactor, which affects the external diffusion of the reaction substrate...

Method used

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  • Preparation method and propane oxydehydrogenation application of rodlike hexagonal boron nitride foam
  • Preparation method and propane oxydehydrogenation application of rodlike hexagonal boron nitride foam
  • Preparation method and propane oxydehydrogenation application of rodlike hexagonal boron nitride foam

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Embodiment 1

[0029] 2.47 g of boric acid was dissolved in 100 mL of ultrapure water, boiled, and 2.50 g of melamine was added several times to completely dissolve until transparent, then naturally cooled to room temperature, and a white hydrogel was precipitated. The white hydrogel was vacuumed at -20°C until lyophilized, transferred to a crucible, and placed in a tube furnace. Under an ammonia atmosphere, the flow rate was 80 mL / min, the temperature was raised at 5 °C / min, and the temperature was kept at 800 °C for 5 h, and then cooled naturally to obtain a white foam sample, that is, a rod-shaped hexagonal boron nitride foam material.

[0030] Take 30 mg of foam material and place it in a U-shaped tube, and fix it with quartz wool at both ends. Feed reaction gas (6 mL / min of propane, 3 mL / min of oxygen, 11 mL / min of nitrogen), raise the temperature to 550°C for reaction, and conduct online chromatographic analysis. (Its photo, schematic diagram of the preparation process are as follows ...

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Abstract

The invention discloses a preparation method and propane oxydehydrogenation application of rodlike hexagonal boron nitride foam, and relates to the fields of material science and technology and petrochemical engineering. The preparation method of the rodlike hexagonal boron nitride foam utilizes a hydrolysis polymerization reaction of melamine and boric acid. A dried precursor is reduced in ammonia gas to generate hexagonal boron nitride which is a white foam solid. The foam is prepared from rodlike hexagonal boron nitride having connected pores (with the size of about 100 nm). The pore structure is beneficial to gas circulation and diffusion, so the foam has good potential as a heterogeneous catalyst. The rodlike hexagonal boron nitride foam shows excellent propane dehydrogenation performance. The method has the advantages of simplicity, high yield, facilitation of large-scale industrial production, and remarkable economic and social benefits.

Description

technical field [0001] The invention discloses a preparation method of rod-shaped hexagonal boron nitride foam and its application in propane oxidative dehydrogenation, and relates to the fields of material science and technology and petrochemical industry. Background technique [0002] The morphology and structure of a material have a significant impact on its properties and applications. Foam materials have properties such as low density, large specific surface area, porosity, and high load capacity, and have a wide range of applications in the fields of thermal insulation, gas sensing, energy, and catalysis. Recently, hexagonal boron nitride was found to have excellent performance in the oxidative dehydrogenation of short-chain alkanes. However, when it is used as an oxidative dehydrogenation catalyst, it is often in a powder state, and it is easy to cause a large pressure drop in a plug flow reactor, affecting the diffusion of reaction substrates and products, and it is...

Claims

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Application Information

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IPC IPC(8): C01B21/064C07C5/48C07C11/06B01J27/24B01J35/10
CPCC01B21/064C07C5/48B01J27/24B01J35/10C07C2527/24C01P2002/72C01P2002/85C01P2004/03C01P2004/04C01P2006/16C07C11/06Y02P20/52
Inventor 黄彩进刘秋文
Owner FUZHOU UNIV
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