Medium-low temperature SCO denitration catalyst and preparation method thereof
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A denitration catalyst, low temperature technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of low NO catalytic activity, high price, slow reaction rate, etc., to improve specific surface area, raw material Low price and easy availability, the effect of improving catalytic efficiency
Active Publication Date: 2020-11-13
INNER MONGOLIA UNIVERSITY
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Molecular sieves have large specific surface area and unique pore structure, but the NO catalytic oxidation activity of molecular sieve catalysts is not high at low temperatures, and only show high-temperature activity. However, limited by thermodynamic equilibrium, NO catalytic activity is not high at high temperatures. The cost is high, so the industrial application of molecular sieves has not yet been realized
Activated carbon catalysts can also catalyze the oxidation of NO, but under low temperature conditions, the reaction process of activated carbon catalytic oxidation of NO requires a long stabilization time, the reaction rate is slow, and the water resistance of activated carbon catalysts is poor, and the amount of catalyst used is extremely large
Noble metal catalysts have relatively high activity, but they are expensive, and the cost of industrial application is high
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Embodiment 1
[0025] Step 1: Weigh 2.70g of potassium permanganate, 0.27g of reduced graphene oxide powder, measure 4ml of concentrated hydrochloric acid and 240ml of pure water, mix continuously for 1 hour, transfer to a hydrothermal reaction kettle for 12 hours at 100°C, and naturally After cooling, wash the precipitate in the kettle with deionized water until the pH is equal to 6, then wash twice with ethanol, and then put it in an oven to dry at 80°C for 12 hours;
[0026] Step 2: Weigh 1.23g of manganese acetate and 10.10g of ferric nitrate, add to 100ml of pure water and stir until completely dissolved, this is solution I, weigh 0.25g of polyethylene glycol 1000, dissolve in 20ml of pure water, this is the solution II, weigh 0.46g of potassium permanganate, add 200ml of pure water and stir until completely dissolved, this is solution III, add the product obtained in step 1 into 100ml of pure water, mix well, this is solution IV; put solution I Stir continuously in a water bath at 90°C...
Embodiment 2
[0028] Step 1: Weigh 2.70g of potassium permanganate, 0.27g of graphene powder, measure 4ml of concentrated hydrochloric acid, 240ml of pure water and mix continuously for 1 hour, transfer to a hydrothermal reaction kettle for 12 hours at 100°C, and cool naturally Wash the precipitate in the kettle with deionized water until the pH is equal to 6, then wash twice with ethanol, and then put it in an oven for 12 hours at 80°C to dry;
[0029]Step 2: Weigh 1.23g of manganese acetate and 10.10g of ferric nitrate, add to 100ml of pure water and stir until completely dissolved, this is solution I, weigh 0.25g of polyethylene glycol 1000, dissolve in 20ml of pure water, this is the solution II, weigh 0.46g of potassium permanganate, add 200ml of pure water and stir until completely dissolved, this is solution III, add the product obtained in step 1 into 100ml of pure water, mix well, this is solution IV; put solution I Stir continuously in a water bath at 90°C, then add solution II, s...
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Abstract
The invention discloses a medium-low temperature SCO denitration catalyst and a preparation method thereof, and relates to a two-step method and a three-step method. A catalyst material is solid powder and comprises the following substances in percentage by weight: 40 to 60 percent of manganese oxide, 40 to 60 percent of iron oxide and 0.0003 to 0.005 percent of graphene. The two-step method comprises the following steps: (1) mixing potassium permanganate, concentrated hydrochloric acid, ultrapure water and reduced graphene oxide, and carrying out a reaction to obtain an intermediate product;and (2) filtering, washing and drying a product obtained after a hydrothermal reaction of the product obtained in the previous step, manganese acetate, ferric nitrate, polyethylene glycol 1000 and potassium permanganate to obtain the catalyst. According to the three-step method, on the basis of the two-step method, the product in the previous step is subjected to a hydrothermal reaction with manganese acetate, ferric nitrate, polyethylene glycol 1000 and potassium permanganate, and the product is filtered, washed and dried. The catalytic oxidation efficiency of the two-step catalyst to NO at 200 DEG C reaches 50%, and the catalytic oxidation efficiency of the three-step catalyst can reach 80% or above. Compared with an existing ferromanganese catalyst, the low-temperature catalytic efficiency of the catalyst is higher, the industrial requirement can be better met, and the catalyst has great potential application prospects in the field of low-temperature denitration.
Description
Technical field: [0001] The invention belongs to the technical field of NOx removal, and relates to two kinds of SCO denitrification catalysts at medium and low temperatures and a preparation method thereof. Background technique: [0002] Nitrogen oxides are important substances that cause air pollution, among which NO and NO 2 Mainly, their large-scale discharge will not only cause a series of environmental problems such as smog, acid rain, near-surface atmospheric ozone destruction, eutrophication of surface water, and photochemical smog, but also stimulate the human central nervous system and respiratory system, seriously threatening human health. . At present, the flue gas denitrification technology mainly used in nitrogen oxide treatment technology is divided into two categories: dry method and wet method: dry method mainly includes selective catalytic reduction (SCR) method, selective non-catalytic reduction (SNCR) method, The wet method mainly includes liquid absorp...
Claims
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