A kind of basic oxide modified boron nitride catalyst and its preparation method and application

A technology of basic oxide and boron nitride, which is applied in the field of basic oxide modified boron nitride catalyst and its preparation, can solve the problem of low reactivity and achieve simple preparation method, good application prospect and easy availability of raw materials Effect

Active Publication Date: 2021-12-03
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Prior to this, the Chinese invention patent with the publication number CN107739297A reported that a non-metallic boron nitride catalyst can be used to directly convert methane to produce products such as carbon monoxide, methanol, and formaldehyde. Although the method provided can effectively inhibit the deep oxidation of the product to generate carbon dioxide , but with low reactivity

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  • A kind of basic oxide modified boron nitride catalyst and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Catalyst Preparation:

[0029] (1) To a solution of methanol and water at a weight ratio of 1: 40ml 5 mixed solution consisting of boric acid and was added 0.618g 18.018g urea and stirred 12h, the resulting mixed solution in a constant temperature water bath at 8h crystal 80 ℃, and the resulting crystal placed in a vacuum oven dried 100 ℃ for 12h, 2h and finally calcined raw boron nitride material prepared at 1000 ℃ in nitrogen, referred to as BN;

[0030] (2) 0.0065g of magnesium nitrate hexahydrate was added to 10mL of ethanol and stirred to dissolve, then added 0.1g step (1) prepared in the original boron nitride material, the resulting mixture was mixed uniformly in a constant temperature water bath after 80 ℃ and stirred until all the solvent was evaporated, the resulting solid was dried 12h 80 deg.] C in a vacuum oven, then calcined at 2h modification made to the basic oxide catalyst is boron in air at 800 deg.] C, referred to as MgO- the content of BN, wherein, BN wa...

Embodiment 2

[0035] Preparation of catalyst:

[0036] (1) 0.618 g of boric acid and 18.018 urea were added to 40 ml of a mixed solution composed of methanol and water and stirred for 6 h, and the resulting mixed solution was placed in a constant temperature water bath, then the resulting crystal was placed in 40 ° C was dried in a vacuum drying tank for 24 h, and finally the original boron nitride material was obtained at 700 ° C for 6 h in nitrogen.

[0037] (2) 0.065 g of hexahydrate is added to 10 mL of ethanol and stirred and dissolved, then the original boron nitride material prepared in 0.1 g of step (1), mixing the resulting mixture at a constant temperature water bath, 40 ° C Stirring was stirred to all solvent evaporation, and the obtained solid was dried in a vacuum drying tank at 40 ° C for 24 h, and then calcined in 400 ° C for 2 h in the air. BN-1, where the content of BN is 90%.

[0038] The catalyst assessment conditions are in Example 1. The results of the assessment are shown ...

Embodiment 3

[0040] The methanol and water in step (1) were converted to 1: 50 by weight, and the amount of urea was adjusted to 30.9 g; the amount of six hydrolysis nitrate in step (2) was adjusted to 0.0337 g, and other conditions did not change. This example catalyst can be obtained, which is mgO-BN-2, wherein the content of BN is 95%.

[0041] The catalyst assessment conditions are in Example 1. The results of the assessment are shown in Table 1.

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Abstract

The invention discloses a basic oxide modified boron nitride catalyst and its preparation method and application. The catalyst is composed of basic oxide and boron nitride. The preparation method of the catalyst is as follows: adding boric acid and urea to a mixed solution composed of methanol and water to crystallize the original boron nitride material; then, adding an alkaline oxide precursor salt by impregnation, and then roasting in air A basic oxide-modified boron nitride catalyst is prepared. The obtained catalyst is heated and activated by feeding inert gas and oxygen-containing gas; finally feeding methane and oxygen to catalyze the selective oxidation of methane to produce formaldehyde and methanol. The method provided by the present invention belongs to the first time that basic oxide is added to boron nitride material as an auxiliary agent as a catalyst for the direct oxidation of methane to produce carbon-platform molecules such as formaldehyde and methanol, and has high catalytic efficiency and selectivity , has great potential for industrial application.

Description

Technical field [0001] The present invention pertains to the art of catalyst preparation and application of technology, particularly relates to an alkaline catalyst and boron oxide modified preparation method and application. Background technique [0002] Our country is now detected methane resources abundant, but are located in remote areas, methane resources as a gaseous product, characteristics that make it difficult to transport the lower directly utilization. Therefore, the conversion of methane to other high value-added products to be used. Pathway can be divided into the direct conversion of methane conversion and indirect conversion, methane indirectly to methane is first converted to carbon monoxide, and then further converted to methanol by hydrogenation of carbon monoxide high value-added product, but the process is complex, and the high energy consumption . Direct transformation into a non-oxidative coupling of methane to take aromatic compound, the preparation of oxi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C07C29/50C07C45/33C07C47/048C07C31/04C07C27/14
CPCB01J27/24C07C29/50C07C45/33C07C47/04C07C31/04Y02P20/52
Inventor 张朝霞殷敏韩沛杰王帅王勇
Owner XIAMEN UNIV
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