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Application of two-dimensional metal carbide material as catalyst for use in direct dehydrogenation reaction of ethylbenzene

A technology of metal carbide and catalyst, which is applied in the application field of two-dimensional metal carbide material as a catalyst for the direct dehydrogenation reaction of ethylbenzene, which can solve the problems of poor long-term stability of nano-carbon catalysts, high energy consumption and high water consumption, and achieve thermal stability Good performance, strong anti-carbon deposition ability, and stable performance

Active Publication Date: 2018-08-17
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of high energy consumption, high water consumption, and poor long-term stability of nano-carbon catalysts when the iron potassium oxide catalyst is used for the direct dehydrogenation of ethylbenzene, the present invention provides a two-dimensional metal carbide material as the direct dehydrogenation of ethylbenzene The application of hydrogen reaction catalyst, the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 50mg two-dimensional titanium carbide material (molecular formula is Ti 3 C 2 o 2 ) into a Φ10 fixed bed quartz tube, with 10mlmin -1 The mixed raw material gas of 2.8% ethylbenzene and helium gas was fed at a flow rate, and reacted at 550° C. for 20 hours. After the reaction, the gas was continuously detected by gas chromatography, and no catalyst deactivation was found during the reaction. Ethylbenzene conversion rate is 92 μmol m -2 g -1 , The selectivity of styrene is 98%, and the total selectivity of other by-products is 2%.

[0020] Use the molecular formula as Ti 3 C 2 (OH) 2 When titanium carbide materials are used, similar reaction results can be obtained under the same reaction conditions as above.

Embodiment 2

[0022] Weigh 50mg two-dimensional titanium carbonitride material (molecular formula is Ti 3 CNO 2 ) into a Φ10 fixed bed quartz tube, with 10mlmin -1 The mixed raw material gas of 2.8% ethylbenzene and helium gas was fed at a flow rate, and reacted at 550° C. for 20 hours. After the reaction, the gas was continuously detected by gas chromatography, and no catalyst deactivation was found during the reaction. Ethylbenzene conversion rate is 91 μmol m -2 g -1 , The selectivity of styrene is 98.5%, and the total selectivity of other by-products is 1.5%.

[0023] Use the molecular formula as Ti 3 CN(OH) 2 When titanium carbonitride material is used, similar reaction results can be obtained under the same reaction conditions as above.

Embodiment 3

[0025] Weigh 50mg two-dimensional titanium carbide material (molecular formula is Ti 3 C 2 o 2 ) into a Φ10 fixed bed quartz tube, with 10mlmin -1 The mixed raw material gas of 2.8% ethylbenzene and helium gas was fed at a flow rate, and reacted at 570° C. for 20 hours. After the reaction, the gas was continuously detected by gas chromatography, and no catalyst deactivation was found during the reaction. The conversion rate of ethylbenzene is 14%, the selectivity of styrene is 98%, and the total selectivity of other by-products is 2%.

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PUM

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Abstract

The invention discloses application of a two-dimensional metal carbide material as a catalyst for use in a direct dehydrogenation reaction of ethylbenzene, and belongs to the technical field of catalysts for use in the direct dehydrogenation reaction of the ethylbenzene. The novel two-dimensional metal carbide material is taken as the catalyst for use in the direct dehydrogenation reaction of theethylbenzene to catalyze direct dehydrogenation of the ethylbenzene without water vapor protection in order to generate styrene, wherein the catalyst is used at the temperature of 300 to 700 DEG C; the catalytic reaction is performed at the air speed of 1,000 to 18,000ml g<-1>h<-1>; the ethylbenzene is 0.5 to 5 percent in volume concentration. The catalyst has the advantages of stable performance,high catalytic activity, high selectivity, prevention of carbon deposition in a reaction process, and no need of water vapor protection.

Description

technical field [0001] The invention relates to the technical field of catalysts for the direct dehydrogenation reaction of ethylbenzene, in particular to the application of a two-dimensional metal carbide material as a catalyst for the direct dehydrogenation reaction of ethylbenzene. Background technique [0002] Styrene, as a derivative of aromatic hydrocarbons, is an important polymerized monomer for the preparation of polystyrene, ABS plastics, resins, styrene-butadiene rubber, etc. in the chemical industry. In the past 20 years, with the continuous development of the global styrene downstream product market, the demand for styrene has increased year by year. It is estimated that by 2020, the domestic styrene production capacity will exceed 10 million tons per year, and according to the currently known plans for the new, expanded and proposed construction of downstream devices, the apparent demand for styrene in downstream devices will reach 12 million tons per year, Th...

Claims

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Application Information

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IPC IPC(8): C07C5/333C07C15/46B01J27/22B01J27/24
CPCB01J27/22B01J27/24B01J35/1009B01J35/1014B01J35/1019C07C5/333C07C2527/22C07C2527/24C07C15/46
Inventor 刘洪阳刁江勇苏党生
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI