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Beta-MnO2 nanosheet catalyst, preparation method and applications thereof

A nanosheet and catalyst technology, applied in the field of β-MnO2 nanosheet catalyst and its preparation, can solve the problems of low denitration activity and the like, and achieve the effects of improving reaction rate, convenient control and good low temperature denitration activity

Inactive Publication Date: 2020-04-14
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved in the present invention is to overcome existing β-MnO 2 The defects and deficiencies of the low denitrification activity of the catalyst at 150-360°C provide a β-MnO 2 The preparation method of the nanosheet catalyst, the γ-MnO with nanosheet morphology is firstly prepared by the amorphous transformation method 2 , the β-MnO obtained after calcination 2 Nanosheet catalysts have better low-temperature denitrification activity and wider temperature window

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  • Beta-MnO2 nanosheet catalyst, preparation method and applications thereof
  • Beta-MnO2 nanosheet catalyst, preparation method and applications thereof
  • Beta-MnO2 nanosheet catalyst, preparation method and applications thereof

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Effect test

Embodiment 1

[0033] A β-MnO 2 The preparation method of nano sheet catalyst, comprises the steps:

[0034] S1. Manganese sulfate monohydrate (MnSO 4 ·H 2 O) Dissolve completely in pure aqueous solution, then add 40wt.% sodium permanganate (NaMnO 4 ) solution, the molar ratio of manganese sulfate to sodium permanganate is 3:2, after 5 minutes of ultrasonic vibration, stand at 25°C for 24h, suction filter, wash until the filtrate is transparent and dry, and obtain amorphous manganese oxide;

[0035] S2. Disperse the dried amorphous manganese oxide in step S1 in pure aqueous solution, then react at 80°C for 24h, then suction filter, wash, and dry to obtain γ-MnO 2 ;

[0036] S3. the γ-MnO in step S2 2 After calcination at 350 °C for 3 h, β-MnO 2 nanosheet catalysts.

Embodiment 2

[0038] A β-MnO 2 The preparation method of nano sheet catalyst, comprises the steps:

[0039] S1. Manganese sulfate monohydrate (MnSO 4 ·H 2 O) Dissolve completely in pure aqueous solution, then add 40wt.% sodium permanganate (NaMnO 4 ) solution, the molar ratio of manganese sulfate to sodium permanganate is 4:2, after 5 minutes of ultrasonic vibration, stand at 25°C for 24h, suction filter, wash until the filtrate is transparent and dry, and obtain amorphous manganese oxide;

[0040] S2. Disperse the dried amorphous manganese oxide obtained in step S1 in a pure aqueous solution, then react at 80°C for 24h, then suction filter, wash, and dry to obtain γ-MnO 2 ;

[0041] S3. The γ-MnO prepared in step S2 2 β-MnO was obtained after calcination at 350 °C for 3 h 2 nanosheet catalysts.

Embodiment 3

[0043] A β-MnO 2 The preparation method of nano sheet catalyst, comprises the steps:

[0044] S1. Manganese sulfate monohydrate (MnSO 4 ·H 2 O) Dissolve completely in pure aqueous solution, then add 40wt.% sodium permanganate (NaMnO 4) solution, the mol ratio of manganese sulfate to sodium permanganate is 3:2. After ultrasonic vibration for 5 minutes, stand at 25°C for 12 hours, suction filter, wash until the filtrate is transparent and dry, and obtain amorphous manganese oxide;

[0045] S2. Disperse the dried amorphous manganese oxide obtained in step S1 in a pure aqueous solution, then react at 80°C for 8h, then suction filter, wash, and dry to obtain γ-MnO 2 ;

[0046] S3. The γ-MnO prepared in step S2 2 β-MnO was obtained after calcination at 350 °C for 3 h 2 nanosheet catalysts.

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Abstract

The invention discloses a beta-MnO2 nanosheet catalyst, a preparation method and applications thereof. The preparation method comprises the following steps: preparing amorphous manganese oxide from amanganese salt and an oxidant according to a molar ratio of (3-15):(2-5); continuously reacting on the basis of amorphous manganese oxide to prepare a gamma-MnO2 nanosheet; and further calcining at atemperature of 350-400 DEG C to obtain the beta-MnO2 nanosheet catalyst. According to the invention, the beta-MnO2 nanosheet catalyst is prepared by an amorphous conversion method; and the catalyst has a two-dimensional structural morphology, has more active sites, shows good low-temperature denitration activity and wide temperature window, has the conversion rate of 50% at 105 DEG C, maintains the conversion rate at more than 90% within a range of 150-360 DEG C, can improve the reaction rate of low-temperature SCR and promote the adsorption and activation of NO and NH3, is simple in preparation method process and convenient to control.

Description

technical field [0001] The invention relates to the technical field of catalyst synthesis, more specifically, to a β-MnO 2 Nanosheet catalyst and its preparation method and application. Background technique [0002] Nitrogen oxides (NO x , mainly NO) is one of the most important air pollutants. Selective catalytic reduction (Selective Catalytic Reduction, SCR) is to eliminate NO x One of the most effective techniques, the technique is in the reducing agent (usually NH 3 ) and catalyst, the NO x Revert to N 2 and produces H 2 O. The NO conversion rate of traditional vanadium-based catalysts is generally lower than 80% at less than 200 °C, which is not suitable for today's low-temperature emission working environment. [0003] A large number of studies have shown that the good low-temperature redox ability of manganese oxide can increase the reaction rate, and it shows excellent denitrification activity in low-temperature SCR reactions. It is a low-temperature denitrif...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J35/02B01D53/86B01D53/56
CPCB01J23/34B01D53/8628B01J35/40
Inventor 余林杨润农蓝邦周子昊韩佳锡孙明余伟雄
Owner GUANGDONG UNIV OF TECH
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