Preparation method of coal tar-based carbon material catalyst that can jointly remove nitrogen oxides and mercury in coal-fired flue gas

A technology for coal-fired flue gas and nitrogen oxides, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve complex process and low removal efficiency To achieve the effect of rich pore structure, good regeneration performance and smooth surface

Active Publication Date: 2020-11-03
SHANDONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] In the above research reports, the former mainly relies on the physical adsorption of activated carbon fibers to remove pollutants in coal-fired flue gas. The process is simple and economical, but it does not have a good removal effect on the pollutants, especially It is aimed at the removal of nitrogen oxides and Hg. The latter adopts the chemical conversion method of catalytic oxidation catalyst, which can target SO in coal-fired flue gas. 2 , NO and elemental mercury removal, but the process is complicated and the removal efficiency is low
That is to say, there are still technical defects in using different catalysts to remove nitrogen oxides and Hg elements

Method used

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  • Preparation method of coal tar-based carbon material catalyst that can jointly remove nitrogen oxides and mercury in coal-fired flue gas
  • Preparation method of coal tar-based carbon material catalyst that can jointly remove nitrogen oxides and mercury in coal-fired flue gas
  • Preparation method of coal tar-based carbon material catalyst that can jointly remove nitrogen oxides and mercury in coal-fired flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Step 1, the purification of coal tar: adopt the method for underpressure distillation, its purpose is to remove quinoline insoluble matter in coal tar, reduce S, O, N content;

[0048] Step 2, in-situ loading, mix the coal tar and polyvinylpyrrolidone (PVP) treated in step 1 and step 2 (the mass ratio of the two is 1:1), impregnate in SnCl 2 and manganese acetate ethanol solution, stirred at room temperature for 10-16h, and dried at 80°C to constant weight;

[0049] Step 3, carbonization, the coal tar loaded with Sn-Mn is carried out in a carbonization furnace, with an inert gas as a medium, and kept at 700 ° C for 2-4 hours to make a coal tar carbon material catalyst;

[0050] Step 4. Oxidation. Put the coal tar material after step 3 in an oxidation furnace, and heat it up to 200-500°C for 1-3 hours at a heating rate of 1-5°C / min in an air atmosphere to complete the oxidation process. , get SnO 2 -MnO 2 Loaded coal tar carbon material catalyst;

[0051] Among them,...

Embodiment 2

[0057] The difference from Example 1 is:

[0058] Mn in preparation step 2 2+ Ethanol solution is selected as manganese nitrate ethanol solution;

[0059] Step 2, in-situ loading, mix the coal tar and polyvinylpyrrolidone (PVP) treated in step 1 and step 2 (the mass ratio of the two is 4:1), impregnate in SnCl 2 And manganese nitrate ethanol solution, stirred at room temperature for 10-16h, and baked at 80°C to constant weight.

[0060] In the second step, the loading amount of Mn is fixed to be 10%, and the Sn / Mn ratio may be 0.6.

[0061] Nitrogen oxide and Hg removal activity evaluation experiments were carried out on the catalyst prepared in this embodiment. The experimental results show that the removal efficiency of nitrogen oxides can reach 86%, and the removal efficiency of Hg can reach 84%.

Embodiment 3

[0063] The difference from Example 1 is:

[0064] Mn in preparation step 2 2+ Ethanol solution is selected as manganese chloride ethanol solution;

[0065] Step 2, in-situ loading, mix the coal tar and polyvinylpyrrolidone (PVP) treated in step 1 and step 2 (the mass ratio of the two is 2:1), impregnate in SnCl 2 And manganese chloride ethanol solution, stirred at room temperature for 10-16h, and baked at 80°C to constant weight.

[0066] In the second step, the loading amount of Mn is fixed to be 10%, and the Sn / Mn ratio may be 0.6.

[0067] Nitrogen oxide and Hg removal activity evaluation experiments were carried out on the catalyst prepared in this example. The experimental results show that the removal efficiency of nitrogen oxides can reach 83%, and the removal efficiency of Hg can reach 80%.

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Abstract

The invention discloses a method for preparing a coal tar-based carbon material catalyst for combined removal of nitric oxide and mercury in coal-fired flue gas, belongs to the technical field of energy chemical engineering and aims to achieve combined removal of pollutants in coal flue gas. The method comprises the following steps: firstly, carrying out purification pretreatment on coal tar; andmixing with polyvinylpyrrolidone (PVP), and soaking into a SnCl2 and Mn<2+> ethanol solution to carry out in-situ carrying; and carrying out carbonization and oxidation in sequence, thereby obtaininga coal tar carbon material catalyst. The coal tar carbon material catalyst prepared by using the method is of a rich pore structure and has a high specific surface area. As the coal tar is adopted asa raw material, the raw material is cheap and easy to obtain, the prepared catalyst is high in mercury removal and denitration efficiency, that is, the efficiency is up to 95% or greater, the catalystis long in service life and good in regenerability and can be popularized and applied, and a novel technical scheme is provided for novel and efficient utilization of the coal tar, and can be popularized and applied.

Description

technical field [0001] The invention belongs to the technical field of energy and chemical industry, and in particular relates to a preparation method of a catalyst suitable for denitration and demercuration. Background technique [0002] The flue gas emitted during the coal combustion process contains a large amount of gaseous pollutants and heavy metal trace element pollutants. Among them, nitrogen oxides and mercury elements have caused serious harm to the environment and human health. Among them, nitrogen oxides include various compounds, such as NO, N 2 O, NO 2 , N 2 o 3 , N 2 o 4 etc., NO, N 2 O, NO 2 . Nitrogen oxides have brought great harm to the human body and the environment, mainly including a series of problems such as acid rain, the hole in the ozone layer, and photochemical smog. In the process of coal combustion, mercury is mainly converted into Hg 0 , HgCl 2 , HgCl 2 and HgO forms exist in flue gas, Hg in the general atmosphere 2+ It is easy to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56B01D53/64
CPCB01D53/8628B01D53/8665B01D2257/602B01D2258/0283B01J23/34
Inventor 张华伟赵淑龙张志兰张鼎元武加峰梁鹏
Owner SHANDONG UNIV OF SCI & TECH
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