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Iron oxide/boron nitride nano-catalyst as well as preparation method and application thereof

A catalyst, boron nitride technology, applied in the field of catalysis, can solve the problems of poor size adjustable variability

Pending Publication Date: 2021-03-23
SYNFUELS CHINA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalysts prepared by impregnation and co-precipitation methods have broad metal grain size distribution and poor size tunability.

Method used

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  • Iron oxide/boron nitride nano-catalyst as well as preparation method and application thereof
  • Iron oxide/boron nitride nano-catalyst as well as preparation method and application thereof
  • Iron oxide/boron nitride nano-catalyst as well as preparation method and application thereof

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preparation example Construction

[0038] The present invention additionally provides the preparation method of above-mentioned catalyst, described method comprises:

[0039] (1) preparing inorganic iron salt solution and boron nitride dispersion respectively; (2) adding the inorganic iron salt solution into the boron nitride dispersion to obtain a suspension; subjecting the suspension to a solvothermal reaction at high temperature to obtain a nanocomposite material comprising boron nitride and iron oxide, and washing, centrifuging, and drying the nanocomposite material; and optionally (4) performing step (3) The resulting dried nanocomposite is calcined to obtain the catalyst.

[0040] The above preparation method of the present invention is based on the following principle: the formation of iron oxide nanoparticles on the surface of hexagonal boron nitride follows a nucleation and growth mechanism. Oxygen-containing functional groups (hydroxyl groups, etc.) on the surface of boron nitride make the surface of...

Embodiment 1

[0127] Embodiment 1: preparation of catalyst of the present invention and Fischer-Tropsch synthesis performance test

[0128] (1) Dissolve ferric nitrate in ethylene glycol and stir until it is completely dissolved to obtain 0.25mol / L and 0.5mol / L ferric nitrate solutions. The ethylene glycol dispersion liquid of the hexagonal phase boron nitride of preparation 5.0g / L; Wherein, the specific surface area of ​​described hexagonal phase boron nitride is 105m 2 / g, the particle size is 400nm.

[0129] (2) 53.6 mL of ferric nitrate solution in step (1) is added dropwise in the ethylene glycol dispersion of 300 mL of boron nitride, while mechanically stirring to obtain a stable and uniform suspension; The mass ratio of element) to hexagonal boron nitride is 50:100, 100:100.

[0130] (3) Transfer the suspension in step (2) to the reaction kettle, react at 180°C for 12h, after the reaction is finished, cool to room temperature naturally, wash with deionized water, centrifuge 3-5 tim...

Embodiment 2

[0134] Embodiment 2: preparation of catalyst of the present invention and Fischer-Tropsch synthesis performance test

[0135] (1) Dissolve ferrous sulfate in dimethylformamide, stir until it dissolves completely, obtain 0.05mol / L ferrous sulfate solution; and prepare the toluene dispersion of 3.0g / L hexagonal phase boron nitride; wherein, The specific surface area of ​​the hexagonal phase boron nitride is 140m 2 / g, the particle size is 100nm.

[0136] (2) Add 41mL of the iron salt solution in step (1) dropwise to the toluene dispersion of 383mL of boron nitride, and magnetically stir at the same time to obtain a stable and uniform dispersion; wherein the active metal iron (calculated as iron element ) to the mass ratio of hexagonal boron nitride is 10:100.

[0137] (3) Transfer the suspension in step (2) to the reactor, and react at 140°C for 24h. After the reaction, cool down to room temperature naturally, wash with deionized water, and centrifuge 5 to 8 times. In a tube f...

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Abstract

The invention discloses an iron oxide / boron nitride nano-catalyst, a preparation method and application of the iron oxide / boron nitride nano-catalyst in catalytic Fischer-Tropsch synthesis. The iron oxide / boron nitride nano-catalyst comprises iron serving as an active metal and boron nitride serving as a carrier, wherein a mass ratio of the active metal iron to the carrier boron nitride is (1-400): 100 in terms of the mass of elemental iron, and the grain size of the iron oxide / boron nitride nano-catalyst is 10 nm-20 nm. The iron oxide / boron nitride nano-catalyst prepared by the method can beapplied to catalyzing a Fischer-Tropsch synthesis reaction. The catalyst has the characteristics of controllable metal grain size (10 nm-20 nm) and uniform size, and shows good wear resistance, high hydrothermal stability, high Fischer-Tropsch synthesis reaction activity, high CO conversion rate, high heavy hydrocarbon (C5+) selectivity and excellent operation stability.

Description

technical field [0001] The invention relates to the field of catalysis, in particular to an iron-based catalyst and its preparation method and its application in catalytic Fischer-Tropsch synthesis, in particular to an iron oxide / boron nitride nanometer catalyst and its preparation method and application. Background technique [0002] Coal is gasified to produce synthesis gas, which is purified and adjusted for H 2 / CO ratio and then synthesize clean fuel through catalytic reaction. Fischer-Tropsch synthesis refers to synthesis gas (containing CO and H 2 , a small amount of CO 2 , methane and N 2 The mixed gas) is catalytically converted into hydrocarbon compounds of different chain lengths and a small amount of organic oxygen-containing compounds. Under different catalysts and reaction conditions, organic compounds such as alkanes, alkenes, aromatics, alcohols, aldehydes, and acids can be produced. The active components of Fischer-Tropsch synthesis catalysts are mainly...

Claims

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Application Information

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IPC IPC(8): B01J27/24C10G2/00
CPCB01J27/24C10G2/332B01J35/40
Inventor 张成华王宪周马彩萍颜琳琳王虎林相宏伟杨勇李永旺
Owner SYNFUELS CHINA TECH CO LTD
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