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Fluorine modified lanthanum manganese composite oxide SCR denitration catalyst and preparation method thereof

A composite oxide and denitration catalyst technology, which is applied in the field of fluorine-modified lanthanum-manganese composite oxide SCR denitration catalyst and its preparation, can solve the problems of poor sulfur and water resistance, and achieve good sulfur and water resistance and a wide range of sources , the effect of easy industrial production

Inactive Publication Date: 2021-08-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the invention is that the current manganese-based catalysts have poor sulfur and water resistance

Method used

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  • Fluorine modified lanthanum manganese composite oxide SCR denitration catalyst and preparation method thereof
  • Fluorine modified lanthanum manganese composite oxide SCR denitration catalyst and preparation method thereof
  • Fluorine modified lanthanum manganese composite oxide SCR denitration catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] Get 8.66g of lanthanum nitrate and 4.65ml of 50% manganese nitrate solution, dissolve them in 100ml of distilled water, then add 15.37g of anhydrous citric acid, stir until completely mixed and dissolved, slowly add the pH regulator ammonia water and keep stirring, adjust the pH= 8. Then stir and evaporate the water in a water bath at 90°C, then age and dry at 120°C for 24 hours, and roast the product at 400°C for 3 hours, then raise the temperature to 800°C for 3 hours to obtain product 1, which is denoted as LM.

Embodiment 2

[0038] 10g of LM and 0.0978g of ammonium fluoride were mechanically stirred, mixed evenly, placed in a muffle furnace and calcined at 360°C for 2h at a heating rate of 5°C / min to obtain product 2, which was designated as 0.5F-LM-1.

Embodiment 3

[0040] 10g LM and 0.197g ammonium fluoride were mechanically stirred, mixed evenly, placed in a muffle furnace and calcined at 360°C for 2h at a heating rate of 5°C / min to obtain product 3, which was designated as 1F-LM-1.

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Abstract

The invention discloses a fluorine modified lanthanum manganese composite oxide SCR denitration catalyst and a preparation method thereof, and belongs to the technical field of denitration catalysts. The technical problem to be solved by the invention is that the current manganese-based catalyst is poor in sulfur resistance and water resistance. The catalyst is prepared from a fluorine element and LaMnO3 according to a certain weight ratio, the fluorine element is uniformly distributed on the surface of LaMnO3, and the preparation method comprises the following steps: synthesizing LaMnO3 by using lanthanum nitrate, manganese nitrate and anhydrous citric acid as raw materials and adopting a citric acid sol-gel method, and then preparing the fluorine-modified lanthanum manganate catalyst by adopting a mechanical mixing method or an impregnation method. The SCR denitration active temperature window is wide, meanwhile, the good sulfur resistance and water resistance are achieved, the preparation process is simple, the requirement for equipment is low, the used raw materials are common chemical reagents, the source is wide, the price is low, the raw materials are easy to obtain, and industrial production is easy.

Description

technical field [0001] The invention belongs to the technical field of denitration catalysts, and in particular relates to a fluorine-modified lanthanum-manganese composite oxide SCR denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides are the main component of air pollution and the precursors of the most problematic pollutants. They not only cause environmental problems such as the hole in the ozone layer, photochemical smog, and acid rain, but also seriously endanger human health. Therefore, it is necessary to control and treat the emission of nitrogen oxides. [0003] NH 3 -SCR denitrification technology is currently the most effective denitrification technology, the core of which is the choice of catalyst. Currently, the most widely used commercial SCR catalyst is V 2 o 5 -MoO 3 / TiO 2 or V 2 o 5 -WO 3 / TiO 2 Catalyst, although the catalyst has high catalytic activity and anti-sulfur and water resistance in the te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/08B01D53/86B01D53/56
CPCB01J27/08B01D53/8628B01D2251/2062
Inventor 郭家秀史雪珂范爱东袁山东李建军楚英豪
Owner SICHUAN UNIV
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