Graphene-loaded titanium-based core-shell-structured low-temperature SCR sulfur-resisting catalyst and preparation method thereof

A core-shell structure, graphene technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve good denitrification activity and selectivity, improve activity and reaction Ability, excellent anti-alkali/alkaline earth metal poisoning effect

Active Publication Date: 2014-12-10
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For SO in current flue gas 2 The problem of severe poisoning of the low-temperature SCR denitrification catalyst caused by the present invention proposes a brand-new graphene-supported titanium-based core-shell denitrification catalyst and its preparation method. 2 TiO 2 The special physical and ch

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  • Graphene-loaded titanium-based core-shell-structured low-temperature SCR sulfur-resisting catalyst and preparation method thereof
  • Graphene-loaded titanium-based core-shell-structured low-temperature SCR sulfur-resisting catalyst and preparation method thereof
  • Graphene-loaded titanium-based core-shell-structured low-temperature SCR sulfur-resisting catalyst and preparation method thereof

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Embodiment 1

[0020] Firstly, MnOx-CeO was prepared by hydrothermal method 2 TiO 2 For the catalyst, the molar ratio of Mn:Ce:Ti is selected to be 0.5:0.7:1. Using cerium nitrate, manganese nitrate, water, and sodium hydroxide as raw materials, the cerium nitrate and manganese nitrate are respectively configured into an aqueous solution with a mass fraction of 20%, and a sodium hydroxide solution with a concentration of 6mol / L is added dropwise until the analysis is complete, and then Transfer the mixed solution to a hydrothermal kettle, react at 120°C for 24h, centrifuge, and alternately wash with deionized water and ethanol, dry the solid at 80°C for 24h, and finally calcinate at 550°C for 4h to obtain nano-MnOx-CeO 2 particulates. The core-shell nanoparticles were prepared in an inverse microemulsion with CTAB as surfactant, n-pentanol as co-surfactant, and cyclohexane as oil phase, wherein the mass fraction of CTAB was 10%, and the mass fraction of cyclohexane was The fraction is 40%...

Embodiment 2

[0022] Firstly, MnOx-CeO was prepared by hydrothermal method 2 TiO 2 For the catalyst, the molar ratio of Mn:Ce:Ti is selected to be 0.5:0.3:1. Using cerium nitrate, manganese nitrate, water, and sodium hydroxide as raw materials, the cerium nitrate and manganese nitrate are respectively configured into an aqueous solution with a mass fraction of 20%, and a sodium hydroxide solution with a concentration of 6mol / L is added dropwise until the analysis is complete, and then Transfer the mixed solution to a hydrothermal kettle, react at 120°C for 24h, centrifuge, wash alternately with deionized water and ethanol, dry the solid at 80°C for 24h, and finally calcinate at 550°C for 4h to obtain nano-MnOx-CeO 2 particulates. The core-shell nanoparticles were prepared in an inverse microemulsion with CTAB as surfactant, n-pentanol as co-surfactant, and cyclohexane as oil phase, wherein the mass fraction of CTAB was 15%, cyclohexane The mass fraction of n-pentanol is 20%, and the mass...

Embodiment 3

[0024] Firstly, MnOx-CeO was prepared by hydrothermal method 2 TiO 2 For the catalyst, the Mn:Ce:Ti molar ratio is selected to be 1:1:1. Using cerium nitrate, manganese nitrate, water, and sodium hydroxide as raw materials, the cerium nitrate and manganese nitrate are respectively configured into an aqueous solution with a mass fraction of 20%, and a sodium hydroxide solution with a concentration of 6mol / L is added dropwise until the analysis is complete, and then Transfer the mixed solution to a hydrothermal kettle, react at 120°C for 24h, centrifuge, wash alternately with deionized water and ethanol, dry the solid at 80°C for 24h, and finally calcinate at 550°C for 4h to obtain nano-MnOx-CeO 2 particulates. The core-shell nanoparticles were prepared in an inverse microemulsion with CTAB as surfactant, n-pentanol as co-surfactant, and cyclohexane as oil phase, in which CTAB mass fraction was 10%, cyclohexane The mass fraction is 30%, and the mass fraction of n-pentanol is ...

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Abstract

The invention provides a graphene-loaded titanium-based core-shell-structured low-temperature SCR sulfur-resisting catalyst and a preparation method thereof. The preparation method of the graphene-loaded titanium-based core-shell-structured catalyst comprises the following steps: firstly forming a compound core-shell structure MnOx-CeO2@TiO2 by taking a nano particle MnOx-CeO2 as a core and TiO2 as a shell, and compounding the MnOx-CeO2@TiO2 with graphene, wherein the size range of the catalyst is within a range of about 20nm-200nm and the mol ratio of Mn to Ce to Ti in the core-shell structure MnOx-CeO2@TiO2 is (0.05-1) to (0.05-1) to 1; and the mass ratio of a graphene carrier to the nano core-shell structure MnOx-CeO2@TiO2 is (0.01-0.6) to 1. According to the invention, the graphene-loaded titanium-based core-shell structure is constructed for the first time and the active center of the catalyst is protected through special physicochemical properties of the core-shell catalyst and the accumulation of ammonium sulfate is reduced by virtue of graphene, so that the sulfur-resisting capability of a low-temperature denitration catalyst is enhanced.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a low-temperature SCR anti-sulfur catalyst with a titanium-based core-shell structure supported by graphene and its preparation process, which is suitable for fixed sources such as coal-fired power plants, industrial boilers, and calcination kilns, and lean combustion The elimination of nitrogen oxides (NOx) originally emitted by gasoline vehicles and diesel vehicles belongs to the field of environmental catalytic materials and environmental protection technologies. Background technique [0002] The research on low-temperature SCR catalytic denitrification technology has continued since the 1990s. With the joint efforts of researchers from various countries, low-temperature SCR denitrification catalysts have been improved time and time again, especially in low-temperature activity and selectivity. improve. In recent years, the problem of sulfur dioxide poisoning of...

Claims

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Application Information

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IPC IPC(8): B01J23/34B82Y30/00B82Y40/00B01D53/56B01D53/86
Inventor 盛重义杨柳周爱奕谭月
Owner NANJING NORMAL UNIVERSITY
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