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Flaky manganese dioxide as well as preparation method and application thereof

A manganese dioxide and flake technology, applied in the field of flake manganese dioxide and its preparation, can solve the problems of low activity and selectivity, limitations and the like, and achieve the advantages of simple operation in the preparation process, good catalytic performance, and good denitration activity. Effect

Active Publication Date: 2020-06-12
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most widely used SCR catalyst is V 2 o 5 / TiO 2 However, its activity temperature window is 300 ℃ ~ 400 ℃, and its activity and selectivity at low temperature are not high, which greatly limits its application

Method used

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  • Flaky manganese dioxide as well as preparation method and application thereof
  • Flaky manganese dioxide as well as preparation method and application thereof
  • Flaky manganese dioxide as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Dissolve ammonium persulfate in 0.08M sodium hydroxide solution, add manganese nitrate dropwise under magnetic stirring (the molar ratio of manganese nitrate to ammonium persulfate is 2:3), react at room temperature for 15min, and the reaction product Carry out centrifugation, washing and drying in sequence to obtain the precursor; place the dried precursor in a muffle furnace to raise the temperature to 350°C at a rate of 1°C / min, and calcinate for 2 hours to obtain a flaky crystal structure of β phase manganese dioxide.

[0037] The flaky manganese dioxide prepared in the present embodiment is characterized, and its XRD spectrum is as follows figure 1 as shown, figure 1 Show that the β-MnO of present embodiment flake manganese dioxide and JCPDF standard card 24-0735 model 2 Correspondingly, it shows that the crystal structure of the flaky manganese dioxide in this example is the β phase. see figure 2 and image 3 , are respectively the SEM images of the precurso...

Embodiment 2

[0039] Dissolve ammonium persulfate in 0.08M sodium hydroxide solution, add manganese nitrate dropwise under magnetic stirring (the molar ratio of manganese nitrate to ammonium persulfate is 2:3), react at room temperature for 30min, and the reaction product Carry out centrifugation, washing and drying in sequence to obtain the precursor; place the dried precursor in a muffle furnace to raise the temperature to 350°C at a rate of 1°C / min, and calcinate for 2 hours to obtain a flaky crystal structure of β phase manganese dioxide.

Embodiment 3

[0041] Dissolve ammonium persulfate in 0.15M sodium hydroxide solution, add manganese nitrate dropwise under magnetic stirring (the molar ratio of manganese nitrate to ammonium persulfate is 2:3), react at room temperature for 60min, and the reaction product Carry out centrifugation, washing and drying in sequence to obtain the precursor; place the dried precursor in a muffle furnace to raise the temperature to 350°C at a rate of 1°C / min, and calcinate for 2 hours to obtain a flaky crystal structure of β phase manganese dioxide.

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Abstract

The invention belongs to the technical field of catalysts, and particularly relates to flaky manganese dioxide as well as a preparation method and application thereof. The invention provides flaky manganese dioxide. The crystal structure of the flaky manganese dioxide is a beta phase. In the present invention, the crystal form structure of the flaky manganese dioxide is a beta phase. Test resultsshow that the flaky manganese dioxide is used for simulating purification treatment of automobile tail gas, shows good catalytic performance as a catalyst for automobile tail gas purification and hasefficient catalytic conversion on NO at 150-400 DEG C. The flaky manganese dioxide has good denitration activity at a low-temperature section and a medium-high-temperature section.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a sheet-like manganese dioxide and its preparation method and application. Background technique [0002] In recent years, air pollution has become an important problem facing the current environment. Nitrogen oxides (NOx) are one of the important components of air pollution. Controlling the content of nitrogen oxides in the atmosphere has become the focus of the work of the environmental protection department. [0003] Selective catalytic reduction (selective catalytic reduction, SCR) is based on NH 3 As a reducing agent, selectively reduce NOx to N 2 and H 2 O denitrification technology is currently the most economical and efficient means of denitrification. The most widely used SCR catalyst is V 2 o 5 / TiO 2 However, its activity temperature window is 300 ℃ ~ 400 ℃, and its activity and selectivity at low temperature are not high, which greatly limits its a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02B01D53/94B01D53/56B01J23/34
CPCC01G45/02B01D53/9418B01J23/34C01P2004/20C01P2004/50C01P2002/72Y02A50/20
Inventor 孙明刘恒发杨润农程高余林
Owner GUANGDONG UNIV OF TECH
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