Wide-temperature-window SCR (selective catalytic reduction) catalyst with modified TiO2 as carrier as well as preparation method and application of SCR catalyst
A kind of SCR catalyst and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of difficulty in meeting emission standards and low purification efficiency, and achieve The effect of wide active temperature range, reduced environmental hazards, and reduced production costs
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example 1
[0024] Add 0.128mol acetylacetone to 0.064mol n-tetrabutyl titanate to make [Ti] / [C 5 h 8 o 2 ] was 1:2; then 50mL of ethanol solution was added, and the sol was obtained after stirring. The sol was concentrated in a water bath at 60°C for 4h, dried at 120°C for 6h, and then calcined at 500°C for 2h to obtain an undoped titanium dioxide carrier.
[0025] The prepared undoped titania carrier was immersed in an ammonium metavanadate aqueous solution, refluxed in a water bath at 60°C for 4h, dried at 120°C for 6h, and then calcined at 350°C for 4h. Among them, V 2 o 5 The loading amount is 1wt%.
[0026] Using the fixed bed activity test device, at a space velocity of 27314h -1 Under conditions, NO concentration 500ppm, NH 3 / NO=1 and O 2 is 5%, evaluate the catalyst that embodiment one obtains to the influence of NO removal rate, the result is as follows figure 1 As shown, the denitrification rate is 89.63% at 330°C.
example 2
[0028] Add 0.128mol acetylacetone to 0.064mol n-tetrabutyl titanate to make [Ti] / [C 5 h 8 o 2 ] at a ratio of 1:2; then add stoichiometric urea and thiourea, and then add 50 mL of ethanol solution, after stirring to obtain a sol, concentrate the sol in a water bath at 60°C for 4 hours, dry it at 120°C for 6 hours, and then dry it at 500°C Calcined at lower temperature for 2 hours to obtain S, N co-doped titania carrier, wherein the added amount of urea is [N] / [Ti]=0.01 in molar ratio, and the added amount of thiourea is [S] / [Ti]=0.03 in molar ratio.
[0029] The prepared doped catalyst was immersed in ammonium metavanadate aqueous solution, refluxed in a water bath at 60°C for 4h, dried at 120°C for 6h, and then calcined at 350°C for 4h. Among them, V 2 o 5 The loading amount is 1wt%.
[0030] Using the fixed bed activity test device, at a space velocity of 27314h -1 Under conditions, NO concentration 500ppm, NH 3 / NO=1 and O 2 It is 5%, evaluates the influence that th...
example 3
[0032] Add 0.128mol acetylacetone to 0.064mol n-tetrabutyl titanate to make [Ti] / [C 5 h 8 o 2 ] at a ratio of 1:2; then add stoichiometric urea and thiourea, and then add 50 mL of ethanol solution, after stirring to obtain a sol, concentrate the sol in a water bath at 60°C for 4 hours, dry it at 120°C for 6 hours, and then dry it at 500°C Calcined for 2 hours to obtain S, N co-doped titanium dioxide carrier, wherein the added amount of urea is based on molar ratio [N] / [Ti]=0.03, and the added amount of thiourea is based on molar ratio [S] / [Ti]=0.03 .
[0033] The prepared doped catalyst was immersed in ammonium metavanadate aqueous solution, refluxed in a water bath at 60°C for 4h, dried at 120°C for 6h, and then calcined at 350°C for 4h. Among them, V 2 o 5 The loading amount is 1wt%.
[0034] Using the fixed bed activity test device, at a space velocity of 27314h -1 Under conditions, NO concentration 500ppm, NH 3 / NO=1 and O 2is 5%, evaluate the catalyst that embodi...
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