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a γ-fe 2 o 3 Nanoparticle-modified nf-mno 2 /atp low temperature denitrification catalyst

A nano-particle, low-temperature denitrification technology, applied in the field of flue gas denitrification, can solve the problems of expensive catalyst carrier, narrow reaction activity range, complicated preparation method, etc., and achieve the effects of abundant reserves, wide temperature range and simple preparation method.

Active Publication Date: 2019-11-12
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the existing flue gas denitrification catalysts with narrow reaction activity range, high activation temperature, and SO resistance. 2 Insufficient performance, expensive catalyst carrier, complex preparation methods and many other problems, providing a γ-Fe 2 o 3 Nanoparticle-modified nf-MnO 2 / ATP low temperature denitrification catalyst and its preparation method

Method used

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  • a γ-fe <sub>2</sub> o <sub>3</sub> Nanoparticle-modified nf-mno <sub>2</sub> /atp low temperature denitrification catalyst
  • a γ-fe <sub>2</sub> o <sub>3</sub> Nanoparticle-modified nf-mno <sub>2</sub> /atp low temperature denitrification catalyst
  • a γ-fe <sub>2</sub> o <sub>3</sub> Nanoparticle-modified nf-mno <sub>2</sub> /atp low temperature denitrification catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Attapulgite raw soil is firstly treated with 3mol / mL HNO 3 Under the condition of 80°C water bath, reflux pretreatment was carried out for 3 hours to remove impurities on the surface of the attapulgite raw soil and purify the attapulgite raw soil. After the water bath, filter with suction, wash with deionized water until neutral, and then dry at 80°C for later use. The purified attapulgite clay is abbreviated as (ATP).

[0018] (2) Grind and sieve the above-mentioned dried ATP, then weigh 1g of ATP and dissolve it in 400mL of deionized water, and ultrasonically treat for 30min to dissociate the ATP crystal beams to obtain a uniformly dispersed ATP suspension. Weigh 2gKMnO 4 Dissolve in ATP suspension, continue to sonicate for 20min, make ATP and KMnO 4 well mixed. Then transfer the above solution into a 500mL three-necked flask, add 40mL of glacial acetic acid to adjust the pH to 3, raise the temperature to 78°C, and react for 4h. After the reaction, suction filt...

Embodiment 2

[0023] (1) Attapulgite raw soil is firstly treated with 3mol / mL HNO 3 Under the condition of 80°C water bath, reflux pretreatment was carried out for 3 hours to remove impurities on the surface of the attapulgite raw soil and purify the attapulgite raw soil. After the water bath, filter with suction, wash with deionized water until neutral, and then dry at 80°C for later use. The purified attapulgite clay is abbreviated as (ATP).

[0024] (2) Grind and sieve the above-mentioned dried ATP, then weigh 1g of ATP and dissolve it in 400mL of deionized water, and ultrasonically treat for 30min to dissociate the ATP crystal beams to obtain a uniformly dispersed ATP suspension. Weigh 2gKMnO 4 Dissolve in ATP suspension, continue to sonicate for 20min, make ATP and KMnO 4 well mixed. Then transfer the above solution into a 500mL three-necked flask, add 40mL of glacial acetic acid to adjust the pH to 3, raise the temperature to 78°C, and react for 4h. After the reaction, suction filt...

Embodiment 3

[0026] (1) Attapulgite raw soil is firstly treated with 3mol / mL HNO 3 Under the condition of 80°C water bath, reflux pretreatment was carried out for 3 hours to remove impurities on the surface of the attapulgite raw soil and purify the attapulgite raw soil. After the water bath, filter with suction, wash with deionized water until neutral, and then dry at 80°C for later use. The purified attapulgite clay is abbreviated as (ATP).

[0027] (2) Grind and sieve the above-mentioned dried ATP, then weigh 1g of ATP and dissolve it in 400mL of deionized water, and ultrasonically treat for 30min to dissociate the ATP crystal beams to obtain a uniformly dispersed ATP suspension. Weigh 0.15g FeSO 4 ·7H 2 O and 0.29g FeCl 3 ·6H 2 O was dissolved in the ATP suspension, and continued to sonicate for 20 minutes to mix the ATP and the solution evenly. Then transfer the above solution into a 500mL three-necked flask, heat up to 90°C for reflux reaction in a water bath, during the reactio...

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Abstract

The invention belongs to the field of flue gas denitration, and specifically provides a gamma-Fe2O3 nanoparticle modified nf-MnO2 / ATP low-temperature denitration catalyst. Directed at the disadvantages of low carrier strength, poor SO2 resistance and complicated preparation method for a conventional flue gas denitration catalyst, the invention provides the gamma-Fe2O3 nanoparticle modified nf-MnO2 / ATP low-temperature denitration catalyst and a preparation method thereof. The preparation method comprises the following steps: with attapulgite clay with large specific surface area and high adsorption performance as a carrier and a reducing agent, allowing the attapulgite clay to react with KMnO4 under a hydrothermal condition so as to prepare a nanoflower-like MnO2-coated attapulgite clay (nf-MnO2-ATP) catalyst, preparing high-performance gamma-Fe2O3 nanoparticles under a low-temperature hydrothermal condition at the same time, and subjecting nf-MnO2 / ATP to surface modification with the high-performance gamma-Fe2O3 nanoparticles so as to prepare the gamma-Fe2O3 / nf-MnO2-ATP denitration catalyst. Thus, N2 selectivity and SO2 resistance of nf-MnO2-ATP are improved. Meanwhile, the preparation method provided by the invention has mild preparation conditions and simple preparation process, and is a safe and highly-efficient preparation method for a low-temperature denitration catalyst.

Description

technical field [0001] The invention belongs to the field of flue gas denitrification, especially a γ-Fe 2 o 3 Nanoparticle-modified nf-MnO 2 / ATP low temperature denitrification catalyst. Background technique [0002] Atmospheric NO x It is one of the main causes of serious environmental problems such as acid rain and photochemical smog. Selective catalytic redox of NO since 1973 x Technology NH 3 -SCR (Selective CTalalytic Reduction, NH 3 -SCR) technology has been used to reduce nitrogen oxides in exhaust gas to N with high selectivity under oxygen-enriched conditions. 2 And is widely used. Common commercial NH 3 -SCR catalyst is V-W-TiO 2 , this type of catalyst requires a higher operating temperature (310-430°C), so the SCR reactor is generally installed between the boiler economizer and the air preheater, but this arrangement can easily lead to catalyst blockage and poisoning deactivation. Reduced catalyst life. If the SCR reactor is arranged after the dust ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2251/2062B01D2258/0283B01J23/002B01J23/8892
Inventor 罗士平唐毅然谢爱娟周兴蒙顾鹏飞金响姚超李霞章左士祥
Owner CHANGZHOU UNIV
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