Fe-based catalyst modified by nitrogen-carbon doping and its preparation method and application

A catalyst, nitrogen-carbon technology, applied in the direction of catalyst activation/preparation, carbon compound catalyst, catalyst, etc., can solve the problems of easy sintering of active components, environmental pollution of Cr-based catalysts, expensive precious metal catalysts, etc., and achieve good catalyst stability , good propane anaerobic dehydrogenation activity, and good industrial application prospects

Active Publication Date: 2021-06-11
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, most of the anaerobic dehydrogenation reactions of propane use the noble metal Pt or Cr which has certain environmental hazards as the dehydrogenation active component. Sintering and environmental pollution problems of Cr-based catalysts limit their large-scale utilization

Method used

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  • Fe-based catalyst modified by nitrogen-carbon doping and its preparation method and application
  • Fe-based catalyst modified by nitrogen-carbon doping and its preparation method and application
  • Fe-based catalyst modified by nitrogen-carbon doping and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] This embodiment provides a nitrogen-carbon doped modified iron-based catalyst, which is prepared by the following steps:

[0059] (1) At room temperature, weigh 3.0g SiO 2 The carrier was dispersed in 100mL of ethylenediamine, stirred and ultrasonicated to obtain a homogeneous mixture I;

[0060] (2) Weigh 4.0 g of dicyandiamide and 0.386 g of iron acetylacetonate into the mixture I, continue ultrasonication and stirring for 10 h at 25°C to fully dissolve and disperse it, and obtain the mixture II;

[0061] (3) The mixture II was rotary evaporated at 80°C, and the obtained product was vacuum-dried at 100°C overnight;

[0062] (4) Place the vacuum-dried product in a tube furnace, and in an Ar atmosphere, raise the temperature to 350°C at a rate of 5°C / min and keep it for 3h, and then rise to 650°C at a rate of 5°C / min And keep it for 2h, continue to raise the temperature to 750℃ at a rate of 5℃ / min and keep it for 2h, and get the nitrogen-carbon doped modified iron-bas...

Embodiment 2

[0085] This embodiment provides a nitrogen-carbon doped modified iron-based catalyst, which is prepared by the following steps:

[0086] (1) At room temperature, weigh 3.0 g of the molecular sieve Silicalite-1 carrier and disperse it in 100 mL of ethylenediamine, stir and sonicate to obtain a homogeneous mixture I;

[0087] (2) Weigh 4.0 g of dicyandiamide and 0.386 g of iron acetylacetonate into the mixture I, continue ultrasonication and stirring for 10 h at 25°C to fully dissolve and disperse it, and obtain the mixture II;

[0088] (3) The mixture II was rotary evaporated at 80°C, and the obtained product was vacuum-dried at 100°C overnight;

[0089] (4) Place the vacuum-dried product in a tube furnace, and in an Ar atmosphere, raise the temperature to 350°C at a rate of 5°C / min and keep it for 3h, and then rise to 650°C at a rate of 5°C / min And keep it for 2h, continue to raise the temperature to 750°C at a rate of 5°C / min and keep it for 2h, to obtain a nitrogen-carbon d...

Embodiment 3

[0108] This embodiment provides a nitrogen-carbon doped modified iron-based catalyst, which is prepared by the following steps:

[0109] (1) At room temperature, weigh 1.5 g of the molecular sieve Silicalite-1 carrier and disperse it in 50 mL of ethylenediamine, stir and sonicate to obtain a homogeneous mixture I;

[0110] (2) Weigh 2.0 g of dicyandiamide and 0.483 g of iron acetylacetonate into the mixture I, continue ultrasonication and stirring for 10 h at 25° C. to fully dissolve and disperse it, and obtain the mixture II;

[0111] (3) The mixture II was rotary evaporated at 80°C, and the obtained product was vacuum-dried at 100°C overnight;

[0112] (4) Place the vacuum-dried product in a tube furnace, and in an Ar atmosphere, raise the temperature to 350°C at a rate of 5°C / min and keep it for 3h, and then rise to 650°C at a rate of 5°C / min And keep it for 2h, continue to raise the temperature to 750°C at a rate of 5°C / min and keep it for 2h, to obtain a nitrogen-carbon ...

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Abstract

The invention provides a nitrogen-carbon doped modified Fe-based catalyst, a preparation method and application thereof. The preparation method of the catalyst comprises: 1) adding a carrier, an iron source, and a carbon and nitrogen source into a solvent to make a suspension I; 2) performing pyrolysis on the dried product of the suspension in an inert atmosphere to obtain the Nitrogen-carbon doped modified Fe-based catalysts. The method for using the nitrogen-carbon-doped modified Fe-based catalyst to catalyze propane for anaerobic dehydrogenation comprises: contacting propane with the nitrogen-carbon-doped modified Fe-based catalyst in a carrier gas atmosphere to undergo an oxygen-free dehydrogenation reaction. The nitrogen-carbon-doped modified Fe-based catalyst prepared by the above preparation method is well suitable for propane anaerobic dehydrogenation, has good propane anaerobic dehydrogenation activity, and has high initial propane conversion rate and propylene selectivity , realizing the efficient conversion of propane.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and relates to a Fe-based catalyst modified by nitrogen and carbon doping, a preparation method thereof and a method for applying the catalyst to propane oxygen-free dehydrogenation. Background technique [0002] Propylene is a basic chemical raw material, which can be used to produce industrial products such as polypropylene, acrylonitrile, and propylene oxide. At present, the main sources of propylene are naphtha steam cracking and fluid catalytic cracking by-products. With the increasing scarcity of petroleum resources, the demand for downstream products of propylene continues to increase, and the production of propylene solely relying on petroleum resources as raw materials cannot meet the current demand for propylene. Propane is one of the components of shale gas. Due to the continuous development of shale gas mining technology in recent years, the use of propane in shale gas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J29/035B01J37/08C07C5/333C07C11/06
CPCB01J27/24B01J29/0356B01J37/086B01J37/088B01J2229/40C07C5/333C07C5/3335C07C2527/24C07C2529/035C07C11/06Y02P20/52
Inventor 李宇明张启扬姜桂元王雅君徐春明赵震
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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