SCR flue gas denitrification catalyst and preparation method therefor
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A denitration catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of hard agglomeration of large grains, decreased catalytic activity, low denitration efficiency, etc. The effect of remarkable effect and high catalytic efficiency
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Problems solved by technology
Domestic production of denitrification catalyst carrier TiO 2 The production process is not easy to form and demould, and the porosity is not ideal. After long-term use under high temperature conditions, the fine grains of anatase titanium dioxide are very easy to grow and transform into rutile type, resulting in hard agglomeration of large grains and a decrease in specific surface area. Catalytic activity decreases, resulting in low denitrification efficiency and short service life
At present, TiO 2 The denitrification rate of the SCR catalyst as a carrier is only 80% to 85%, and the service life is about 25000h. If it is used in high-temperature flue gas for a long time, the service life will be greatly reduced, which is not conducive to the smooth progress of production
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preparation example Construction
[0033] Further, the catalyst preparation method includes the following processes:
[0034] First, prepare the active ingredient solution, mix ammonium metavanadate, monoethanolamine and water to make ammonium metavanadate solution, and mix ammonium tungstate, oxalic acid solution and water to make ammonium tungstate solution;
[0035] Then, the kneader kneaded, the modified silicon carbide carrier was added to the kneader, and ammonium metavanadate solution, ammonium tungstate solution, glass fiber, pulp cotton, stearic acid, polyethylene oxide were added at a low speed to carry out mixing;
[0036] Finally, the finished product is prepared. After mixing, aging, pre-extrusion, extrusion, primary drying, secondary drying, and roasting are performed to obtain the SCR flue gas denitrification catalyst product.
[0037] Further, in the finished product preparation process, the staling time is 18h-32h; the pre-extrusion pressure is 1Mpa-4Mpa; the extrusion pressure is 2Mpa-5Mpa, t...
Embodiment 1
[0039]1. Carrier preparation: Mix 83.5g of silicon carbide and nitric acid into a hydrothermal kettle and heat until the impurities are dissolved, filter and dry to obtain silicon carbide powder, add 1.0g of ceria and 2.0g of zirconia to the silicon carbide powder , adding sodium borohydride, loading cerium and zirconium simple substances on the surface of silicon carbide, washing, drying, and roasting to obtain a modified silicon carbide carrier;
[0040] 2. Catalyst preparation: first, prepare the active ingredient solution, mix 6.6g ammonium metavanadate, 6.6g monoethanolamine and 50g water to make ammonium metavanadate solution, mix 8.3g ammonium tungstate, 4.1g oxalic acid solution and 100g water Mix to make ammonium tungstate solution;
[0041] Then, the kneader is kneaded, the modified silicon carbide carrier is added to the kneader, the ammonium metavanadate solution and the ammonium tungstate solution are added at a low speed, and then 2.0g glass fiber, 2.0g pulp cott...
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Abstract
The invention relates to an SCR flue gas denitrification catalyst and belongs to the technical field of flue gas denitrification. The flue gas denitrification catalyst comprises the following components in parts by weight: 65-95 parts of a carrier, 5.5-15.5 parts of active ingredients and 4-16 parts of auxiliary materials, wherein the carrier comprises 65-85 parts of silicon carbide. According to the technical scheme, the invention provides the denitrification catalyst with the main component of the carrier being silicon carbide, and the catalyst can maintain a relatively high catalytic efficiency at 600 DEG C, so that the problem that a conventional titanium catalyst is inactivated at the temperature is solved, and the benefit is remarkable. The invention further relates to a preparation method for the SCR flue gas denitrification catalyst. The preparation method comprises two steps: carrier preparation; and catalyst preparation. According to the scheme provided by the invention, silicon carbide is surface oxidized by adopting an acidic hydrothermal method, metal salt is reduced to metal single element by virtue of strong reducing property of sodium borohydride, the metal single element is deposited on the surface of the carrier, and a final catalyst product is obtained through a series of processes, so that the catalyst has an industrial production prospect.
Description
technical field [0001] The invention relates to a denitration catalyst, in particular to an SCR flue gas denitration catalyst, and also relates to a preparation method of an SCR flue gas denitration catalyst, which belongs to the technical field of flue gas denitration. Background technique [0002] Nitrogen oxides (NO x ) is a kind of air pollutant with great harm, which will cause certain damage to human health and the survival of animals and plants, such as the formation of acid rain, photochemical smog, etc. Today, with the increasing awareness and requirements of environmental protection, how to remove nitrogen oxides The emission of pollutants has become an increasingly urgent issue. Selective catalytic reduction (SCR for short) denitrification refers to the use of reducing agent NH 3 , methane, thiourea, CO, H 2 Other reducing agents selectively convert NO x Reduction to non-polluting N 2 , so as to achieve the purpose of purifying the air. SCR denitrification te...
Claims
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