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Application of boron carbonitride material in catalyzing oxidative dehydrogenation of light alkane to prepare olefin

A low-carbon alkane and oxidative dehydrogenation technology, which is applied in the direction of hydrocarbons, hydrocarbons, physical/chemical process catalysts, etc., can solve the problems of high cost and complicated preparation process of boron nitride materials, and achieve low cost and excellent The effect of versatility and good olefin yield

Inactive Publication Date: 2020-02-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The excellent catalyst performance of boron nitride materials has greatly promoted the industrialization of the oxidative dehydrogenation of low-carbon alkanes, but the preparation process of boron nitride materials is complicated and the cost is high

Method used

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  • Application of boron carbonitride material in catalyzing oxidative dehydrogenation of light alkane to prepare olefin
  • Application of boron carbonitride material in catalyzing oxidative dehydrogenation of light alkane to prepare olefin
  • Application of boron carbonitride material in catalyzing oxidative dehydrogenation of light alkane to prepare olefin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The application of the boron, carbon and nitrogen materials described in this example in the preparation of alkenes by catalyzing the oxidative dehydrogenation of light alkanes includes the following steps:

[0022] 1) Place 0.1g of boron carbon nitrogen material in a quartz tube in a fixed-bed reactor, and raise the temperature to 450°C at 5°C / min under a mixed atmosphere of propane, oxygen, and helium; the volume of propane, oxygen, and helium The ratio is 1:1:4, and helium plays a diluting role;

[0023] 2) After the temperature in step 1) is stabilized for half an hour, use the online chromatographic test system to start the test. The total flow rate of the mixed gas is 36ml / min, the reaction temperature is 450-520°C, and the pressure is 0.1MPa. After stabilizing for half an hour, Start to collect data, and the test results are: when the reaction temperature is 450°C, the conversion rate of propane is 4.3%, and the selectivity of propylene is 89%; when the reaction ...

Embodiment 2

[0025] The application of the boron, carbon and nitrogen materials described in this example in the preparation of alkenes by catalyzing the oxidative dehydrogenation of light alkanes includes the following steps:

[0026] 1) Place 0.3g of boron carbon nitrogen material in a quartz tube in a fixed bed reactor, and raise the temperature to 500°C at 10°C / min under the protection of oxygen, ethane and helium, in which ethane, oxygen and helium The volume ratio is 2:1:4, and the helium plays a diluting role;

[0027] 2) After the temperature in step 1) is stable, use the online chromatographic test system to start the test. The total flow rate of the mixed gas is 49ml / min, the reaction temperature is 500-600°C, and the pressure is 0.1MPa. After half an hour of stabilization, start to collect data, the test results are: the reaction temperature is 500°C, the conversion rate of ethane is 11%, and the selectivity of ethylene is 94%; and when the reaction temperature is 550°C, the con...

Embodiment 3

[0029] The application of the boron, carbon and nitrogen materials described in this example in the preparation of alkenes by catalyzing the oxidative dehydrogenation of light alkanes includes the following steps:

[0030] 1) Place 0.2g of boron carbon nitrogen material in a quartz tube in a fixed bed reactor, and raise the temperature to 430°C at 10°C / min under the protection of oxygen, butane and nitrogen, wherein the volume of butane, oxygen and nitrogen The ratio is 2:1:4, nitrogen plays a diluting role;

[0031] 2) After the temperature in step 1) is stable, use the online chromatographic test system to start the test. The total flow rate of the mixed gas is 42ml / min, the reaction temperature is 430-500°C, and the pressure is 0.1MPa. After half an hour of stabilization, every 10 The data is collected once at ℃, and then the changes of butane conversion and product selectivity are observed.

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Abstract

The invention belongs to the technical field of catalyst application, and particularly relates to an application of a boron carbonitride material in catalyzing the oxidative dehydrogenation of a lightalkane to prepare an olefin. Under the reaction atmosphere, B-O sites at the serrated site of the boron carbonitride material react with the alkane to form hydroxyl groups to induce a reaction to start, the carbon in the boron carbonitride material reacts with an oxidant to form carbonyl groups to become another active site in the reaction, the carbonyl groups react with hydrogen in the light alkane to become hydroxyl groups at a certain temperature, and thereby the hydrogen in the light alkane is removed to obtain the corresponding olefin. The boron carbonitride material has a stable two-dimensional structure, and the selectivity of the olefin in the product is improved while the thermal stability of the material is ensured. At the same time, a single material has two active sites, the density of the active sites is increased, and thereby the yield of the olefin is improved under the same reaction condition.

Description

Technical field: [0001] The invention belongs to the technical field of catalyst application, and specifically relates to the application of boron, carbon and nitrogen materials to catalyze the oxidative dehydrogenation of low-carbon alkanes to prepare olefins. Background technique: [0002] As a brand-new olefin preparation technology, low-carbon alkane dehydrogenation technology has always attracted the attention of universities, research institutions and enterprises. Among them, the direct dehydrogenation of propane to propylene has been industrialized, and its market share is increasing year by year. Although the direct dehydrogenation technology is atom-economy and single-step, the reaction process is limited by thermodynamic equilibrium, and the reaction is strongly endothermic. Although the conversion rate of alkanes can be improved at high temperature, catalyst deactivation, carbon deposition and product cracking will occur at high temperature. And other problems are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C07C11/06C07C5/333C07C11/04C07C11/08
CPCB01J27/24C07C5/333C07C11/06C07C11/04C07C11/08Y02P20/52
Inventor 赵学波代鹏程曹磊刘丹丹
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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