Method for performing oxydehydrogenation of ethylbenzene by using carbon nanofibers loaded on surface of carbon foams as catalyst

A nano-carbon fiber and surface-loaded technology, which is applied in the direction of chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of new carbon/carbon composite materials that are not unfolded, and achieve easy operation, easy amplification, and low equipment requirements. high effect

Inactive Publication Date: 2011-11-16
DALIAN UNIV OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

Although there has been some research on the preparation of nano-carbon fiber composites supported on the surface of foamed carbon, the research on the application of this new carbon / carbon composite material, especially in the field of heterogeneous catalysis, has not yet been carried out.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put 0.09g carbon nanofiber composite material loaded on the surface of carbon foam with integral structure as a catalyst bed into the reactor. The pore size of the carbon foam is 500 microns, the length of carbon nanofibers is about 50 microns, and the space velocity of the gas reactant is 34300mL / g. h, the molar ratio of ethylbenzene and oxygen is 0.5: 1, and the concentration of ethylbenzene is 2%; the reaction temperature is 450° C., and the gas chromatographic analyzer with a methane conversion furnace is used to analyze the product composition, and the conversion rate of ethylbenzene is 26%, and styrene The selectivity was 74%.

Embodiment 2

[0018] Put 0.15g carbon nanofiber composite material loaded on the surface of carbon foam with integral structure as a catalyst bed into the reactor. The carbon foam pore size is 500 microns, the carbon nanofiber length is about 30 microns, and the gas reactant space velocity is 34300mL / g. h, the molar ratio of ethylbenzene and oxygen is 0.5: 1, and the concentration of ethylbenzene is 2%; the reaction temperature is 400° C., and the gas chromatographic analyzer is equipped with a methane conversion furnace to analyze the product composition, and the conversion rate of ethylbenzene is 15%, and styrene The selectivity was 85%.

Embodiment 3

[0020] Put 0.2g carbon nanofiber composite material loaded on the surface of carbon foam with integral structure as a catalyst bed into the reactor. The pore size of carbon foam is 300 microns, the length of carbon nanofibers is about 80 microns, and the space velocity of gas reactants is 14000mL / g. h, the molar ratio of ethylbenzene and oxygen is 0.5: 1, and the concentration of ethylbenzene is 2%; the reaction temperature is 480° C., and the gas chromatographic analyzer with a methane conversion furnace is used to analyze the product composition, and the conversion rate of ethylbenzene is 45%, and styrene The selectivity was 52%.

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Abstract

A method for performing the oxydehydrogenation of ethylbenzene by using carbon nanofibers loaded on the surface of carbon foams as a catalyst, and belongs to the technical field of the inorganic nonmetallic carbon material science. The method is to use the carbon nanofibers loaded on the surface of carbon foams as a catalyst in the oxydehydrogenation reaction of ethylbenzene, wherein the conversion rate of ethylbenzene is up to 26%, the selectivity is up to 74% and the method shows excellent stability. The method is characterized in that the technology is simple, the production cost is low, the method is environmentally-friendly, the pressure of the catalyst bed is reduced, and the catalyst is easy to separate and recycle, etc.

Description

technical field [0001] The invention relates to a method for catalyzing the oxidative dehydrogenation of ethylbenzene by loading nano-carbon fibers on the surface of foamed carbon, and belongs to the scientific and technical field of carbon materials, a branch of inorganic non-metallic material science and technology. Background technique [0002] Styrene is one of the most important chemical monomers. At present, it is mainly obtained in industry by direct dehydrogenation of ethylbenzene with potassium-promoted iron oxide as a catalyst under superheated steam conditions. However, there are many disadvantages in this process, such as thermodynamic limitations, High energy consumption, irreversible catalyst deactivation and coking. In order to overcome these problems, scientists from various countries have devoted themselves to improving the oxidative dehydrogenation process of ethylbenzene, and have successfully developed technologies such as oxidative dehydrogenation, carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/46C07C5/48B01J21/18B01J35/10
Inventor 邱介山肖南周颖凌铮赵宗彬
Owner DALIAN UNIV OF TECH
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