Preparation method of water-resistant sulfur-resistant ultralow-temperature denitration catalyst and denitration catalyst

Abstract

The invention provides a preparation method of a water-resistant sulfur-resistant ultralow-temperature denitration catalyst, which comprises the following steps: (1) weighing precursor substances of V2O5, WO3, MoO3 and MnOx, dissolving in water, adding titanium dioxide, stirring in a water bath environment, drying, and calcining to obtain the ultralow-temperature denitration catalyst; (2) weighing the ultralow-temperature denitration catalyst prepared in the step (1), dissolving the ultralow-temperature denitration catalyst in an organic solvent, and stirring and dispersing; then dropwise adding perfluorooctyltriethoxysilane, and stirring under reflux condensation; and after the reaction is completed, carrying out suction filtration and washing with an organic solvent for many times, and drying to obtain the water-resistant sulfur-resistant ultralow-temperature denitration catalyst. The preparation method has the beneficial effect that the ultralow-temperature denitration catalyst which is stable and has water-resistant and sulfur-resistant functions can be prepared.

Description

technical field [0001] The invention relates to the technical field of industrial catalysts, in particular to a method for preparing a water-resistant and sulfur-resistant ultra-low temperature denitration catalyst and the denitration catalyst. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere, and one of the important causes of acid rain, photochemical smog and ozone layer destruction; industries such as coal-fired power plants, cement plants, and steel plants are NO x In recent years, with the continuous improvement of national air pollution emission standards, especially the proposal of ultra-low emission standards for non-coal power industry flue gas, the research on denitrification technology for low-temperature flue gas (below 200 °C) has received extensive attention. [0003] At present, selective catalytic reduction (SCR) denitrification technology is mainly used for denitrification of industrial flue gas, in which...

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Problems solved by technology

[0003] At present, selective catalytic reduction (SCR) denitration technology is mainly used for denitrification of industrial flue gas, in which the catalyst is the key to SCR technology; the current common commercial vanadium titanium tungsten series denitrification catalyst is generally used at a temperature above 300 ° C, which cannot meet the requirements of construction, cement, steel, etc. The flue gas temperature working condition of 120-300 ℃ in other industries, so it is of great significance to develop denitration catalysts with high activity at low temperature; the common low temperature denitration catalysts include vanadium-based catalysts, manganese-based catalysts and iron-based catalysts; as in the publication number CN111530477A discloses a manganese-based ultra-low temperature denitrification catalyst powder, and its component content is: MnO 2 : 8-25wt.%, Fe 2 o 3 : 0.5-10wt.%, WO 3 : 0.5-10wt.%, TiO 2 : 25-90.99wt.%, CeO 2 : 0-10wt.%, Sm 2 o 3 : 0-5wt.%, ZrO 2 : 0-5wt.%, Y 2 o 3 : 0-5wt.%, SnO 2 : 0-5wt.%, this document uses manganese oxide, iron oxide and a large number of rare earth element oxides as active materials, titanium oxide as carrier, and the SO usually contained in flue gas 2 , water vapor, etc., are easy to react with the reactant NH under the action of catalytic active substances 3 The reaction produces solid ammonium bisulfate, which easily adheres to the surface of the catalyst, reducing the denitrification activity of the catalyst

[0004] It is of great significance to develop a low-temperature denitrification catalyst resistant to water and sulfur. For example, the publication number is CN 106311213 A, which discloses a low-temperature denitrification catalyst resistant to sulfur and water. The molecular formula of the low-temperature denitrification catalyst is MV 2 o 4 , wherein, M is any one of Fe, Cu, Mn, Co and Cr, and the low-temperature denitrification catalyst is prepared from metal nitrate and vanadium pentoxide through ball milling, acidification, calcination, etc.; the process uses metal salt with V 2 o 5 As a raw material, through acidification treatment, the acidic sites of the catalyst are increased to improve its water resistance and anti-sulfur ability, but the increased acidic groups are easily affected by high temperature treatment and are unstable

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