Nano carbon-loaded cobalt-nitrogen-carbon catalytic material as well as preparation method and application thereof

A cobalt-nitrogen-carbon catalytic material and technology for catalytic materials, which are used in catalyst activation/preparation, carbon compound catalysts, chemical instruments and methods, etc., can solve the problems of low activity of nano-carbon catalysts, environmental pollution by toxic catalysts, and poor long-term stability. Achieve good thermal stability and anti-carbon deposition, good structural stability and chemical activity, and specific surface area to resist carbon deposition.

Active Publication Date: 2020-09-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of noble metal-based and chromium metal-based catalysts in the prior art when used for direct dehydrogenation of propane to propylene, they are expensive, prone to carbon deposition and deactivation, and toxic catalysts Environmental pollution and the problems of low activity and poor long-term stability of nano-carbon catalysts, the present invention...

Method used

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  • Nano carbon-loaded cobalt-nitrogen-carbon catalytic material as well as preparation method and application thereof
  • Nano carbon-loaded cobalt-nitrogen-carbon catalytic material as well as preparation method and application thereof
  • Nano carbon-loaded cobalt-nitrogen-carbon catalytic material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Weigh 1g of oxidized carbon nanotube powder into a 200ml round bottom flask, add 100ml of absolute ethanol as a solvent, and place it in a 100W ultrasonic oscillator for 30 minutes to disperse the oxidized carbon nanotubes evenly. After dissolving 135 mg of phenanthroline in 40 ml of absolute ethanol, it was added to the carbon dioxide nanotube dispersion and stirred at room temperature for 30 min. Then the cobalt nitrate of 100mg is dissolved in the dehydrated alcohol of 60ml, and it is added in the constant pressure funnel of 60ml and is installed on the round bottom flask, open the funnel switch and make the cobalt salt solution drop by drop in the mixed dispersion liquid, Continue stirring at room temperature for 12 hours after the cobalt salt solution is completely dripped. After the stirring time expired, the solvent was distilled off under reduced pressure using a rotary evaporator at 40° C. to obtain a solid powder. Afterwards, put the obtained solid powder int...

Embodiment 2

[0060] Take by weighing 250mg the nano-carbon supported cobalt-nitrogen-carbon powder catalyst synthesized in Example 1 and pack it into a Φ10 fixed-bed quartz tube, with 15ml min -1 A mixed feed gas with a volume percentage of 2% propane and helium in equilibrium was introduced at a flow rate, and reacted at 550° C. for 8 hours. After the reaction, the gas was continuously detected by gas chromatography. The conversion of propane was 14%, the selectivity of propylene was 96%, and the total selectivity of other C1 and C2 was 4%.

[0061] Figure 6 It is a comparison chart of the activity of oxidized carbon nanotubes loaded with different contents of cobalt, nitrogen and carbon catalysts and reference materials in the propane dehydrogenation reaction. From the data in the figure, it can be seen that the catalytic activity of nano-carbon-supported cobalt-nitrogen-carbon catalytic materials comes from the cobalt-nitrogen-carbon layer, and the catalytic performance of the composi...

Embodiment 3

[0063] Take by weighing 200mg the nanometer carbon supported cobalt nitrogen carbon powder catalyst synthesized in embodiment 1 and pack in Φ10 fixed-bed quartz tube, with 15ml min -1 The mixed raw material gas of propane and helium with a flow rate of 2% by volume was introduced, and reacted at 570° C. for 20 hours. After the reaction, the gas was continuously detected by gas chromatography. The conversion of propane was 20%, the selectivity to styrene was 95%, and the total selectivity of other C1 and C2 was 5%.

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Abstract

The invention discloses a nano carbon-loaded cobalt-nitrogen-carbon catalytic material as well as a preparation method and application thereof, and belongs to the technical field of propane dehydrogenation reaction catalysts. The compounding of nano carbon and cobalt-nitrogen-carbon is completed by the processes of complexing a cobalt salt precursor and a phenanthroline ligand, in-situ dipping thecobalt salt precursor and the phenanthroline ligand on the nano carbon surface, calcining, and pickling. The composite material can solve the problems of low catalytic performance of nano carbon andlow utilization efficiency and poor stability of an active cobalt-nitrogen-carbon component. The catalytic material is used as a catalyst for propane dehydrogenation reaction, propane is catalyzed tobe directly dehydrogenated to generate propylene under the conditions of no water, no oxygen and normal pressure, and the use temperature of the catalyst is 400-600 DEG C. The catalyst is stable in performance, and is high in catalytic activity and high in propylene selectivity in direct dehydrogenation reaction, carbon deposition is not prone to happening in the reaction process, the preparationmethod is simple and convenient, and raw materials are easy to obtain.

Description

technical field [0001] The invention relates to the technical field of catalysts for propane dehydrogenation reaction, in particular to a nano-carbon-supported cobalt-nitrogen-carbon catalytic material and a preparation method and application thereof. Background technique [0002] Propylene is a very important chemical raw material, which can be used to produce different kinds of petrochemical products, such as polypropylene, propylene oxide, propionaldehyde and acrylonitrile. In the past 20 years, the global propylene demand market has continued to expand, and it is expected that there will be considerable growth in the next few years, and the production volume will reach 165 million tons in 2030. The main source of propylene raw material is petroleum, but its reserves are decreasing year by year after a large amount of exploitation, and the price keeps rising. These reasons lead to the urgent need for the development of new energy sources. With the advancement of modern h...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10B01J37/02C07C5/333C07C11/06
CPCB01J27/24B01J35/1019B01J35/023B01J37/0203C07C5/333C07C2527/24C07C11/06Y02P20/52
Inventor 齐伟曹天龙
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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