Selective denitrification catalyst prepared by hydrothermal method and preparation process thereof
A technology for denitrification catalyst and preparation process, which is applied in the field of selective catalytic reduction denitrification catalyst and its preparation process, can solve the problems of urgent control of nitrogen oxides and ineffective control of nitrogen oxide emissions, and achieve good denitrification activity and easy Easy to master and craft
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Embodiment 1
[0024] The molar ratio of raw materials is titanium dioxide: water: sodium hydroxide: copper nitrate: ammonium tungstate=1: 100: 3: 0.05: 0.006, titanium dioxide adopts commercial P25 (produced by German Degussa company, particle size 20-45nm, which contains anatase Mineral TiO 2 about 70%, rutile about 30%). Dissolve sodium hydroxide in water to prepare a strong base solution, then add P25 and copper nitrate dissolved in water to the strong base solution, stir for 12 hours, then add ammonium tungstate dissolved in oxalic acid and stir for 12 hours, then pour into hot water Heat in water at 150°C for 24 hours in the kettle, wash the sample after water heating with dilute hydrochloric acid for 7 hours, filter, dry at 80°C for 16 hours, and finally burn at 300°C for 5 hours to obtain the finished catalyst.
[0025] Grind and screen the prepared catalyst, take 40-60 mesh particles, put them into a fixed-bed quartz tube reactor for activity and selectivity testing, the reaction t...
Embodiment 2
[0027] The molar ratio of raw materials is titanium dioxide: water: sodium hydroxide: chromium nitrate: ammonium molybdate = 1:500:20:0.1:0.02, titanium dioxide is anatase TiO prepared by hydrothermal method 2 , particle size 10nm. Dissolve sodium hydroxide in water to prepare a strong alkali solution, and then add TiO to the strong alkali solution 2 and water-soluble chromium nitrate, stirred for 15 hours, then added water-soluble ammonium molybdate and stirred for 12 hours, then poured into a hydrothermal kettle and heated at 130°C for 36 hours, and the sample after hydrothermal treatment was washed with dilute hydrochloric acid for 7 hours. Filter, dry at 60°C for 15 hours, and finally burn at 400°C for 3 hours to obtain the finished catalyst.
[0028] Grind and screen the prepared catalyst, take 40-60 mesh particles, put them into a fixed-bed quartz tube reactor for activity and selectivity testing, the reaction temperature is 250-450°C, and the space velocity is 150,000h...
Embodiment 3
[0030] The molar ratio of raw materials is nano titanium dioxide: water: sodium hydroxide: copper sulfate: ammonium tungstate = 1: 800: 70: 1: 0.5, titanium dioxide is anatase TiO prepared by sol-gel method 2 , particle size 15nm. Dissolve sodium hydroxide in water to prepare a strong alkali solution, and then add TiO to the strong alkali solution 2 and copper sulfate dissolved in water, stirred for 12 hours, then added ammonium tungstate dissolved in oxalic acid and stirred for 12 hours, then poured into a hydrothermal kettle and heated at 200°C for 16 hours, and the sample after hydrothermal treatment was washed with dilute hydrochloric acid for 9 hours. Filter, dry at 100°C for 8 hours, and finally burn at 500°C for 7 hours to obtain the finished catalyst.
[0031] Grind and screen the prepared catalyst, take 40-60 mesh particles, put them into a fixed-bed quartz tube reactor for activity and selectivity testing, the reaction temperature is 250-450°C, and the space velocit...
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