Metal-doped cryptomelane molecular-sieve catalyst as well as preparation method and application thereof

A metal-doped, manganese-potassium ore technology, applied in molecular sieve catalysts, catalyst activation/preparation, separation methods, etc., can solve the problems of ammonia escape, high carbon monoxide concentration in exhaust smoke, etc., and achieve improved removal rate, excellent resistance to sulfur and water Performance, effect of large specific surface area

Pending Publication Date: 2021-09-28
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to overcome the deficiencies of the prior art, to provide a metal-doped recessive manganese-potassium ore molecular sieve catalyst and its preparation method and application, to solve the high concentration of carbon monoxide in the exhaust gas of the existing denitrification technology and ammonia slip problem

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  • Metal-doped cryptomelane molecular-sieve catalyst as well as preparation method and application thereof

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preparation example Construction

[0029] combine figure 1 Shown, a kind of preparation method of metal-doped recessive manganese potassium ore molecular sieve catalyst comprises the steps:

[0030] S1, manganese sulfate MnSO 4 ·H 2 O and potassium nitrate KNO 3 Dissolve in deionized water, mix to obtain solution A, dissolve potassium hydrogen persulfate and metal salt in deionized water, and mix to obtain solution B;

[0031] S2. Mix solution A and solution B, and place them in a high-pressure reactor for hydrothermal reaction, filter, wash, dry the solid product, and obtain the metal-doped latent manganese-potassium ore molecular sieve catalyst after grinding.

[0032] It can be understood that cryptopotassium manganese oxide molecular sieve is a new type of material similar to zeolite molecular sieve structure, which has the advantages of large specific surface area, low isoelectric point, strong oxidation ability, and high cation exchange capacity. The pore structure makes it exhibit excellent conductiv...

Embodiment 1

[0050] This embodiment provides a method for preparing a metal-doped recessive manganite molecular sieve catalyst, comprising the following steps:

[0051] 1) Add 0.69gMnSO 4 ·H 2 O and 0.83g KNO 3 Dissolve in 25mL of deionized water, mix with 7.5g of potassium persulfate and 0.356g of cobalt nitrate dissolved in 50mL of deionized water, and stir vigorously;

[0052] 2) Transfer the mixed solution prepared in step 1) to a 100mL polytetrafluoroethylene-lined reactor and seal it at 120°C for 24 hours, then filter the solid product obtained by the reaction, wash it with water, dry it, and then grind it into a powder. A recessive manganite molecular sieve catalyst with a Co doping amount of 0.3 was obtained.

[0053] The recessive manganese ore molecular sieve catalyst with a Co doping amount of 0.3 prepared in Example 1 has a reaction temperature of 150°C and a space velocity of 5000h -1 , CO and NO were respectively under 1000ppm to carry out the out-of-stock reaction.

[0...

Embodiment 2

[0056] This embodiment provides a method for preparing a metal-doped recessive manganite molecular sieve catalyst, comprising the following steps:

[0057] 1) Add 0.69gMnSO 4 ·H 2 O and 0.83g KNO 3 Dissolved in 25mL of deionized water, mixed with 7.5g of potassium persulfate and 0.475g of cobalt nitrate dissolved in 50mL of deionized water, and stirred vigorously;

[0058] 2) Transfer the mixed solution prepared in step 1) to a 100mL polytetrafluoroethylene-lined reactor and seal it at 120°C for 24 hours, then filter the solid product obtained by the reaction, wash it with water, dry it, and then grind it into a powder. A recessive manganite molecular sieve catalyst with a Co doping amount of 0.4 was obtained.

[0059] The recessive manganese ore molecular sieve catalyst with a Co doping amount of 0.4 prepared in Example 2 has a reaction temperature of 150°C and a space velocity of 5000h -1 , CO and NO were respectively under 1000ppm to carry out the out-of-stock reaction....

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Abstract

The invention provides a metal-doped cryptomelane molecular-sieve catalyst and a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolving manganese sulfate and potassium nitrate in deionized water, conducting mixing to obtain a solution A, dissolving potassium hydrogen persulfate and metal salt in deionized water, and carrying out mixing to obtain a solution B; and S2, mixing the solution A and the solution B, putting the mixture into a high-pressure reaction kettle for a hydrothermal reaction, and filtering, washing, drying and grinding a solid product to obtain the metal-doped cryptomelane molecular-sieve catalyst. The metal-doped cryptomelane molecular-sieve catalyst with uniform particle size and a core-shell structure is prepared by utilizing a hydrothermal synthesis method, and compared with a conventional cryptomelane type molecular sieve, the catalyst has higher surface oxygen hole density, larger specific surface area and more excellent sulfur resistance and water resistance, and can effectively improve the removal rate of NO in flue gas.

Description

technical field [0001] The invention relates to the technical field of flue gas catalytic denitrification, in particular to a metal-doped recessive manganese-potassium ore molecular sieve catalyst and its preparation method and application. Background technique [0002] Flue gas includes flue gas emitted from power plants and metallurgical plants, which generally contain nitrogen oxides (nitrogen oxides account for 0.01-0.10%, including nitrogen monoxide and / or nitrogen dioxide, and the volume of nitrogen monoxide in nitrogen oxides accounting for more than 90%), sulfur dioxide, water vapor, oxygen, carbon monoxide (accounting for 0.08-1.0%), carbon dioxide, etc., and nitrogen oxides are seriously polluted. Therefore, flue gas denitrification is an urgent problem in the field of flue gas environmental protection. one. [0003] At present, the flue gas denitrification technology at home and abroad is mainly selective catalytic reduction (SCR). The main commercially used V ...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01J37/10B01D53/86B01D53/56
CPCB01J29/76B01J37/10B01D53/8628B01J2229/186B01D2258/0283B01D2257/404
Inventor 覃远航罗海彬杨犁马广伟王存文汪铁林吴再坤张燎原吕仁亮马家玉杜军
Owner WUHAN INSTITUTE OF TECHNOLOGY
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