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Polyacid functionalized nitrogen-rich porous carbon as well as preparation method and application thereof

An acid-functionalized, porous carbon technology, applied in chemical instruments and methods, separation methods, inorganic chemistry, etc., can solve the problems of difficult to efficiently remove hydrogen sulfide, lose catalytic activity, affect desulfurization ability, etc. The effect of improving the utilization rate and increasing the durability of desulfurization

Active Publication Date: 2022-07-26
HENAN AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Dry desulfurization has the advantages of high sensitivity, basically no corrosion, wide application conditions, simple operation and low operating cost, but due to the presence of CO in industrial gases 2 Such as acid gas, common physical adsorption or acid-base reaction is not easy to achieve efficient removal of hydrogen sulfide
Compared with traditional carbon, nitrogen-rich porous carbon (NPC) not only has structural properties such as large specific surface area and rich pore structure, but also has chemical properties such as enhanced basic sites, surface polarity and catalytic activity, but NPC catalysts need to be used in relatively When used under high temperature conditions, when the temperature is >180°C, NPC can maintain a stable desulfurization ability, but when the temperature is <180°C, the effect of sulfur deposition will cause NPC to lose its catalytic activity, thereby affecting its desulfurization ability

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  • Polyacid functionalized nitrogen-rich porous carbon as well as preparation method and application thereof
  • Polyacid functionalized nitrogen-rich porous carbon as well as preparation method and application thereof
  • Polyacid functionalized nitrogen-rich porous carbon as well as preparation method and application thereof

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preparation example Construction

[0030] The invention provides a preparation method of polyacid functionalized nitrogen-rich porous carbon, comprising the following steps:

[0031] (1) mixing the polyacids, water and the macrocyclic compound and carrying out ultrasonication to obtain an inclusion compound;

[0032] (2) Mixing the clathrate, the nitrogen-containing compound, the activator and the carbon source to carry out a carbonization reaction to obtain a polyacid functionalized nitrogen-enriched porous carbon.

[0033] In the present invention, the polyacid compound, water and the macrocyclic compound are mixed and ultrasonicated to obtain the inclusion compound. In the present invention, the polyoxometalate preferably includes one or more of phosphotungstic acid, phosphomolybdic acid, silicotungstic acid and silico-molybdic acid; the polyoxometalate monomer preferably includes tungstic acid one or more of sodium, sodium molybdate and ammonium molybdate; the macrocyclic compound preferably includes one o...

Embodiment 1

[0045] Weigh 4 g of phosphomolybdic acid, dissolve it in 20 mL of purified water, then weigh 5 g of β-cyclodextrin, and ultrasonically treat it for 120 min to obtain an inclusion compound;

[0046] Weigh 0.5g of the clathrate, 4g of ammonium oxalate and 4g of sodium bicarbonate, mix it with 6g of rice husks, then transfer to a tube furnace, feed nitrogen, and control the nitrogen flow to be 60mL / min. The carbonization reaction was carried out in the middle, and the reaction temperature was controlled at 800 °C for 1 h to obtain the polyacid functionalized nitrogen-rich porous carbon;

[0047] Fill 0.2 g of the polyacid functionalized nitrogen-rich porous carbon into a quartz tube with an inner diameter of 8 mm and a length of 40 cm, and under room temperature conditions, a mixed gas with a flow rate of 100 mL / min is introduced to carry out desulfurization, wherein the described The mixed gas includes hydrogen sulfide, oxygen and nitrogen, and the concentration of the hydrogen ...

Embodiment 2

[0050] Weigh 4 g of phosphomolybdic acid, dissolve it in 20 mL of purified water, weigh 5 g of β-cyclodextrin, and ultrasonically treat it for 120 min to obtain an inclusion compound;

[0051] Weigh 0.25g of the clathrate, 4g of ammonium oxalate and 4g of sodium bicarbonate, mix it with 6g of rice husks, then transfer to a tube furnace, feed nitrogen, and control the nitrogen flow to be 60mL / min. The carbonization reaction was carried out in the middle, and the reaction temperature was controlled at 800 °C for 1 h to obtain the polyacid functionalized nitrogen-rich porous carbon;

[0052] Fill 0.2 g of the polyacid functionalized nitrogen-rich porous carbon into a quartz tube with an inner diameter of 8 mm and a length of 40 cm, and under room temperature conditions, a mixed gas with a flow rate of 100 mL / min is introduced to carry out desulfurization, wherein the described The mixed gas includes hydrogen sulfide, oxygen and nitrogen, and the concentration of the hydrogen sulf...

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Abstract

The invention belongs to the technical field of air pollution control, and particularly relates to polyacid functionalized nitrogen-rich porous carbon as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a polyacid compound, water and a macrocyclic compound, and carrying out ultrasonic treatment to obtain an inclusion compound; the polyacid compound comprises one or more of polyoxometallate and a polyoxometallate monomer; and mixing the clathrate compound, a nitrogen-containing compound, an activating agent and a carbon source, and carrying out carbonization reaction to obtain the polyacid functionalized nitrogen-rich porous carbon. The preparation method provided by the invention is simple in step, convenient to operate, high in product yield and low in cost, and has good economic value and social benefit. The prepared polyacid functionalized nitrogen-rich porous carbon is not only suitable for medium and low temperature conditions, but also has a high mass transfer characteristic, and can realize efficient removal of hydrogen sulfide.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a polyacid functionalized nitrogen-enriched porous carbon and a preparation method and application thereof. Background technique [0002] hydrogen sulfide (H 2 S) is a malodorous acid gas that widely exists in a variety of industrial gases (natural gas, biogas, etc.) and industrial activities (fuel oil hydrogenation, landfill, etc.). Its strong corrosiveness and toxicity will not only lead to industrial equipment And the serious corrosion of the pipeline, increase the operation and maintenance cost, and also pose a great threat to the life and health of the relevant practitioners. In addition, hydrogen sulfide is converted into sulfur dioxide through combustion reactions, which in turn causes acid rain, which is one of the causes of air pollution. Therefore, the efficient removal and conversion of hydrogen sulfide is a key part of industrial safety pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/318B01D53/52B01D53/81B01J21/18B01J21/20
CPCC01B32/348C01B32/318B01D53/52B01D53/81B01J21/18B01J21/20
Inventor 黄岩王竞侦聂兆君马双龙郝晓倩
Owner HENAN AGRICULTURAL UNIVERSITY
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