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Carbide/carbon nitride catalyst for selective oxidation desulfurization of hydrogen sulfide and preparation method thereof

A technology of carbon nitride and carbide, applied in physical/chemical process catalysts, chemical instruments and methods, preparation/purification of sulfur, etc., can solve the problems of low sulfur conversion rate and stability

Inactive Publication Date: 2020-10-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conversion rate and stability of selective oxidative desulfurization of carbon nitride are still low, and it is urgent to improve

Method used

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  • Carbide/carbon nitride catalyst for selective oxidation desulfurization of hydrogen sulfide and preparation method thereof
  • Carbide/carbon nitride catalyst for selective oxidation desulfurization of hydrogen sulfide and preparation method thereof
  • Carbide/carbon nitride catalyst for selective oxidation desulfurization of hydrogen sulfide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The invention provides a carbide / carbon nitride hydrogen sulfide selective oxidation desulfurization catalyst and a preparation method thereof, specifically comprising the following steps:

[0029] 1) Weigh a certain amount of melamine and place it in an alumina crucible, place the crucible in a muffle furnace, and set a heating program to raise the temperature to 550°C for 120min at a heating rate of 5°C / min. Down to room temperature, take out carbon nitride (yellow solid);

[0030] 2) Weigh a certain mass of 100mg ammonium molybdate, 100mg glucose, and 1000mg carbon nitride obtained in 1), mix and grind for 30min to obtain a powdery mixture;

[0031] 3) Put the powdery mixture in 2) in a tube furnace, draw a vacuum, and then pass in an inert gas, repeat this operation three times, set the heating program, and raise the heating rate to 800°C for 60 minutes at a heating rate of 5°C / min. , take out the carbide of molybdenum;

[0032] 4) Mix and grind the carbon nitride...

Embodiment 2

[0036] 1) Weigh a certain amount of melamine and place it in an alumina crucible, place the crucible in a muffle furnace, and set a heating program to raise the temperature to 550°C for 120min at a heating rate of 5°C / min. Down to room temperature, take out carbon nitride (yellow solid);

[0037] 2) Weigh a certain mass of 100mg ammonium molybdate, 100mg glucose, and 1000mg carbon nitride obtained in 1), mix and grind for 30min to obtain a powdery mixture;

[0038] 3) Put the powdery mixture in 2) in a tube furnace, draw a vacuum, and then pass in an inert gas, repeat this operation three times, set the heating program, and raise the heating rate to 800°C for 60 minutes at a heating rate of 5°C / min. , taking out molybdenum carbides (Mo 2 C);

[0039] The results show that the hydrogen sulfide conversion rate of the catalyst is greater than 99% at 160°C.

Embodiment 3

[0041] 1) Weigh a certain amount of melamine and place it in an alumina crucible, place the crucible in a muffle furnace, and set a heating program to raise the temperature to 550°C for 120min at a heating rate of 5°C / min. Down to room temperature, take out carbon nitride (yellow solid);

[0042] 2) Weigh a certain mass of 100mg ammonium molybdate, 100mg glucose, and 1000mg carbon nitride obtained in 1), mix and grind for 30min to obtain a powdery mixture;

[0043]3) Put the powdery mixture in 2) in a tube furnace, draw a vacuum, and then pass in an inert gas, repeat this operation three times, set the heating program, and raise the heating rate to 800°C for 60 minutes at a heating rate of 5°C / min. , take out the carbide of molybdenum;

[0044] 4) Mix and grind the carbon nitride obtained in 1) and the carbide of molybdenum obtained in 3) for 30 minutes to obtain a powder mixture;

[0045] 5) Put the powdery mixture in 4) in a tube furnace, draw a vacuum, and then pass in an...

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Abstract

The invention relates to a carbide / carbon nitride catalyst for selective oxidation desulfurization of hydrogen sulfide and a preparation method thereof, belonging to the technical field of catalyst synthesis. The catalyst is characterized in that a mass ratio of carbon nitride to carbide in the catalyst is (0-20): (1-10). When the airspeed of the catalyst is 6000 mL / (g*h), the conversion rate of hydrogen sulfide at 190 DEG C is greater than 99%, and high stability is achieved at the same time; the conversion rate of the hydrogen sulfide is still greater than 85% after 28 hours of a reaction, and the selective oxidative desulfurization performance of the carbon nitride catalyst is effectively improved.

Description

technical field [0001] The invention relates to a carbide / carbon nitride hydrogen sulfide selective oxidation desulfurization catalyst and a preparation method thereof, belonging to the technical field of catalyst synthesis. Background technique [0002] Hydrogen sulfide is a highly toxic gas emitted by chemical industry processes. For example, processes such as natural gas processing and utilization, crude oil hydrodesulfurization, and coal chemistry will release hydrogen sulfide, which will cause great harm to humans and the environment. When hydrogen sulfide When the concentration is greater than 700ppm, it may even cause death. In addition, hydrogen sulfide, whether in gaseous or solution form, is extremely corrosive. [0003] At present, there are three main technologies for hydrogen sulfide removal, including low-temperature Claus reaction process, reduction absorption, and selective oxidation of hydrogen sulfide. Among them, the selective oxidation of hydrogen sulfid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B17/04
CPCB01J27/24C01B17/0426
Inventor 雷永鹏周科朝周雯刘毅
Owner CENT SOUTH UNIV
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