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Porous Co3O4 catalyst with wood 3D ordered pore structure for mercury removal and preparation method of porous Co3O4 catalyst

A pore structure and catalyst technology, which is applied in the field of Co3O4 catalysts with ordered pores, can solve the problems of poor thermal stability of carbon materials, and achieve the effects of promoting mass transfer, enhancing anchoring, and high thermal stability

Active Publication Date: 2021-06-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst retains the original regular channels while exposing more active sites, which can greatly improve the Co 3 o 4 The mercury removal activity and temperature window of the catalyst solve the problem of poor thermal stability of the carbon material itself

Method used

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  • Porous Co3O4 catalyst with wood 3D ordered pore structure for mercury removal and preparation method of porous Co3O4 catalyst
  • Porous Co3O4 catalyst with wood 3D ordered pore structure for mercury removal and preparation method of porous Co3O4 catalyst

Examples

Experimental program
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Effect test

Embodiment example 1

[0030] Saw the wooden column into thin circular slices, select a suitable position, and cut into small wood pieces of 5×3×2mm. Put 2g of small wood chips in a water bath at 95°C and boil for 6 hours. The boiled wood chips were dried in an oven at 80°C for 12 hours.

[0031] Weigh 10 g of cobalt nitrate solid and 40 g of deionized water to prepare a cobalt nitrate solution with a mass fraction of 20%, and use ultrasonic stirring for 10 min to accelerate dissolution. Dip the wood chips into the solution, and place them in a water bath at 30°C for 24 hours at a constant temperature. Remove the safety film, absorb the moisture, and put it in a blast drying oven at 60°C for 24 hours.

[0032] The dried samples were placed in a tube furnace for carbonization treatment under the protection of inert gas nitrogen, the gas flow rate was 60mL / min, the heating rate was 1°C / min, the carbonization temperature was 500°C, and the carbonization time was 3h. The sample was taken out and plac...

Embodiment example 2

[0035]Saw the wooden column into thin circular slices, select a suitable position, and cut into small wood pieces of 5×3×2mm. Put 2g of small wood chips in a water bath at 90°C and boil for 4 hours. The boiled wood chips were dried in an oven at 70°C for 14 hours.

[0036] Weigh 5 g of cobalt nitrate solid and 45 g of deionized water to prepare a cobalt nitrate solution with a mass fraction of 10%, and use ultrasonic stirring for 10 min to accelerate dissolution. Put the wood chips into the solution for immersion, and place them in a water bath at 20°C for 12 hours at a constant temperature. Remove the safety film, absorb the moisture, and put it in a blast drying oven at 80°C for 36 hours.

[0037] The dried samples were placed in a tube furnace for carbonization treatment under the protection of inert gas nitrogen, the gas flow rate was 50mL / min, the heating rate was 2°C / min, the carbonization temperature was 450°C, and the carbonization time was 4h. The sample was taken ...

Embodiment example 3

[0040] Saw the wooden column into thin circular slices, select a suitable position, and cut into small wood pieces of 5×3×2mm. Put 2g of small wood chips in a water bath at 85°C and boil for 6 hours. The boiled wood chips were dried in an oven at 60°C for 8 hours.

[0041] Weigh 15 g of cobalt nitrate solid and 35 g of deionized water to prepare a cobalt nitrate solution with a mass fraction of 30%, and use ultrasonic stirring for 10 min to accelerate the dissolution. Put the wood chips into the solution for immersion, and place them in a water bath at 40°C for 16 hours at a constant temperature. Remove the safety film, absorb the moisture, and put it in a blast drying oven at 70°C for 28 hours.

[0042] The dried samples were placed in a tube furnace for carbonization treatment under the protection of inert gas nitrogen, the gas flow rate was 70mL / min, the heating rate was 3°C / min, the carbonization temperature was 550°C, and the carbonization time was 2h. The sample was t...

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Abstract

The invention discloses a porous Co3O4 catalyst with a wood 3D ordered pore structure for mercury removal and a preparation method of the porous Co3O4 catalyst, and belongs to the field of coal-fired flue gas mercury emission control. The main preparation method of the catalyst comprises the following steps: taking renewable wood biochar with a wide source as a sacrificial template, dipping in a Co3O4 precursor solution with a certain concentration, drying, then calcining in a tubular furnace, so that biomass carbonization and active component precursor decomposition are carried out at the same time, and then burning off wood under an air condition to obtain the Co3O4 catalyst. The catalyst prepared by taking the wood as the sacrifice template retains natural ordered, straight-through and 3D conduit pore channels of the wood for conveying water and inorganic salt, greatly reduces the mass transfer resistance of the reaction, and has good thermal stability at the same time. The preparation method provided by the invention can well solve the problems of disordered pore channels, large mass transfer resistance and narrow reaction temperature window of the traditional catalyst, and can realize higher mercury removal efficiency in a wide temperature window with lower catalyst mass.

Description

technical field [0001] The invention belongs to the relevant technical field of industrial mercury removal, belongs to the research and application of catalytic oxidation of metal oxide catalysts to remove elemental mercury, and relates to a Co 3 o 4 The catalyst method, the catalyst can be used but not limited to the field of industrial mercury removal. Background technique [0002] Mercury is highly toxic, non-degradable and bioaccumulative, and will cause long-term harm to the ecological environment and human health. As one of the main environmental pollutants at present, mercury has aroused widespread concern all over the world. The sources of mercury can be divided into two categories, namely anthropogenic and natural sources. Natural sources include: volcanoes, geothermal activities, forest fires, soil and water releases, etc.; man-made sources mainly include: fossil fuel combustion (mainly coal combustion), non-ferrous metal (such as lead, zinc, copper) smelting, m...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J35/04B01J37/00B01J37/02B01J37/08B01D53/86B01D53/64
CPCB01J37/0018B01J37/0207B01J37/084B01J23/75B01D53/8665B01J35/56Y02A50/20
Inventor 张晓鹏程捷王曦邈王紫薇贺高红宋欣欣
Owner DALIAN UNIV OF TECH
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