A titanium-based composite catalyst for purifying volatile organic compounds in high-sulfur coal-fired flue gas and its preparation method and application
A technology of volatile organic compounds and composite catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of high toxicity and cannot be directly applied to commercial industrial sources. Solve problems such as catalytic oxidation technology and materials of non-volatile organic substances, and complex treatment atmosphere, and achieve good stability, excellent catalytic oxidation activity of VOCs, and simple and easy preparation method
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Embodiment 1
[0029] (1) Anatase TiO 2 Preparation of nanoparticles:
[0030] Mix 40 mL ethanol and 2 mL ammonia water to obtain solution A, mix 50 mL tetrabutyl titanate and 10 mL ethanol to obtain solution B, and stir solution A and solution B at room temperature for 20 min at the same time, and then dissolve solution B gradually Add dropwise into solution A to obtain solution C, stir at room temperature for 30 min, then transfer to the liner of the polytetrafluoroethylene reactor, and finally put the liner of the polytetrafluoroethylene reactor into the high-pressure reactor, and heat it at 150 ℃ After reacting for 12 h, after natural cooling, the precipitate was centrifuged and washed 3 times with ethanol at 6500 r / min, transferred to a vacuum oven at 105 °C for 12 h, and after grinding, anatase TiO was obtained. 2 nanoparticles;
[0031] (2) Anatase TiO 2 Preparation of Nanoparticle-supported Vanadium-Copper Oxide:
[0032] Mix 0.046 g of ammonium metavanadate, 0.296 g of copper ni...
Embodiment 2
[0035] (1) Anatase TiO 2 Preparation of nanoparticles:
[0036]Mix 50 mL of ethanol and 2 mL of ammonia water to obtain solution A, mix 50 mL of tetrabutyl titanate and 10 mL of ethanol to obtain solution B, stir solution A and solution B at room temperature for 30 min at the same time, and then dissolve solution B dropwise Add solution A to obtain solution C, stir at room temperature for 30 min, then transfer to the liner of the polytetrafluoroethylene reactor, and finally put the liner of the polytetrafluoroethylene reactor into the high-pressure reactor, and react at 150 ℃ hydrothermally 12 h, after natural cooling, the precipitate was washed twice by centrifugation with ethanol at 8000 r / min, transferred to a vacuum oven at 110 °C for 12 h, and after grinding, anatase TiO 2 nanoparticles;
[0037] (2) Anatase TiO 2 Preparation of Nanoparticle-supported Vanadium-Iron Oxide:
[0038] Mix 0.046 g of ammonium metavanadate, 0.724 g of ferric nitrate and 20 mL of deionized w...
Embodiment 3
[0040] Evaluation of VOCs catalytic oxidation activity: using toluene (C 7 h 8 ) as a probe molecule to explore the catalytic oxidation activity of the catalyst to toluene at different temperatures. The degradation reaction of catalytic oxidation of toluene was carried out in a self-made reactor. The test conditions were as follows: the concentration of toluene was 50 ppm, the dosage of catalyst was 100 mg, the reaction temperature was 150 ℃~390 ℃, the reaction flow rate was 200 mL / min, and the space velocity was 120000 h -1 , the reaction atmosphere is simulated coal-fired flue gas, where NH 3 The concentration is 50-500 ppm (50 ppm is selected in this example), the NO concentration is 50-500 ppm (50 ppm is selected in this example), and the SO 2 The concentration is 50~1500 ppm (1000ppm is selected in this example), 5 vol%O 2 , N 2 To balance the gas; use a hydrogen ion flame (FID) detector and a gas chromatograph connected to the nickel reformer to detect the concentra...
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