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Low-temperature SCR denitration catalyst with titanium-based core-shell structure and preparation method of catalyst

A denitration catalyst, core-shell structure technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems such as manganese, cerium and titanium catalysts, poisoning, etc. , to achieve the effect of improving anti-SO2 ability, inhibiting erosion, good denitration activity and selectivity

Inactive Publication Date: 2014-12-10
NANJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the manganese-cerium-titanium catalyst has high low-temperature SCR denitrification activity, the active centers MnOx and CeO in the catalyst 2 highly susceptible to SO 2 Irreversible poisoning occurs due to erosion, so so far, there is no example of successful industrial application of manganese cerium titanium catalyst

Method used

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  • Low-temperature SCR denitration catalyst with titanium-based core-shell structure and preparation method of catalyst
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  • Low-temperature SCR denitration catalyst with titanium-based core-shell structure and preparation method of catalyst

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Embodiment 1

[0018] Using the hydrothermal method, select the molar ratio of Mn:Ce:Ti to be 0.4:0.07:1. 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%, and the mass fraction of n-pentanol is 50%. First mi...

Embodiment 2

[0020] Using the hydrothermal method, the molar ratio of Mn:Ce:Ti is selected as 0.4:0.8:1. 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 the inverse microemulsion with CTAB as surfactant, n-pentanol as co-surfactant and cyclohexane as oil phase. First mix 6% CTAB, 30% cyclohexane and 64% n-pentanol, stir until transparent, then add MnOx-CeO 2 Nanoparticle dispersion. Adjust the pH value with nitric...

Embodiment 3

[0022]Using the hydrothermal method, select the molar ratio of Mn:Ce:Ti to be 0.3:1:1. 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, 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 8%, and the mass fraction of cyclohexane was The fraction is 30%, and the mass fraction of n-pentanol is 62%. First CTAB, c...

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Abstract

The invention provides a low-temperature SCR (Selective Catalytic Reduction) denitration catalyst with a titanium-based core-shell structure and a preparation method of the catalyst. The titanium-based core-shell structure of the catalyst is formed by use of composite nanoparticles MnOx-CeO2 as the core and TiO2 as the shell and the size range of the catalyst is from 20nm to 200nm, wherein the molar ratio of the three elements Mn, Ce and Ti is (0.05-1): (0.05-1): 1. The preparation method of the catalyst mainly comprises the following steps: (1) mixing cerous nitrate with a manganese nitrate solution, dropwise adding a sodium hydroxide solution and then shifting the mixed solution to a hydrothermal kettle, and carrying out reacting, centrifuging, washing, drying and calcining to obtain the nanoparticles MnOx-CeO2; (2) preparing the nanoparticles with the core-shell structure in a reversed-phase microemulsion with CTAB (Cetyltrimethyl Ammonium Bromide) as a surfactant, n-amyl alcohol as a cosurfactant and cyclohexane as an oil phase. The low-temperature SCR denitration catalyst with a titanium-based core-shell structure has the advantages that the titanium-based core-shell structure is constructed for the first time, the center of the catalyst is protected by use of the TiO2 shell, and the probability that the active center contacts with SO2 in flue gas is reduced, and therefore, the active center is prevented from irreversible poisoning caused by erosion of SO2.

Description

technical field [0001] The present invention relates to a kind of nanometer MnOx-CeO 2 As the core, with TiO 2 Catalyst and preparation process of titanium-based core-shell structure nanomaterials for the shell, suitable for stationary sources such as coal-fired power plants, industrial boilers, calcination kilns, and mobile sources such as lean-burn gasoline vehicles and diesel vehicles, etc. to emit nitrogen oxides (NOx) The invention belongs to the technical fields of environmental catalytic materials and environmental protection. Background technique [0002] Low-temperature selective catalytic reduction (SCR) denitrification technology is a new flue gas denitrification technology in recent years, and it is also a hot spot in the field of flue gas denitrification in my country. However, a problem existing in the current low-temperature SCR catalytic technology is that the catalyst is prone to produce SO at low temperature. 2 Poisoning, even after desulfurization in fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B82Y30/00B82Y40/00B01D53/56B01D53/86B01D53/94
Inventor 盛重义吴忠标周爱奕莫建松王岳军
Owner NANJING NORMAL UNIVERSITY
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