Plate type wide temperature anti-sulfur and anti-alkali metal SCR denitration catalyst and preparation method thereof
A denitration catalyst, flat-plate technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst carriers, chemical instruments and methods, etc., can solve the problems of easy sulfur poisoning, alkali metal poisoning, and narrow active temperature range. , to increase the specific surface area, improve the anti-sulfur poisoning performance, and improve the low-temperature denitration activity.
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[0035] The preparation method of the flat plate type wide temperature anti-sulfur and anti-alkali metal SCR denitration catalyst provided by the invention, such as figure 1 shown, including the following steps:
[0036] S1. Preparation of catalyst carrier:
[0037] Under stirring conditions, add cerium nitrate and zirconium oxychloride powder into concentrated ammonia water in turn, then slowly add ascorbic acid and sodium citrate and stir evenly, then slowly add ethanol solution of tetrabutyl titanate, stir evenly, and then add Sodium hydroxide solution, react under hydrothermal conditions at 160~200℃ for 24~48h; after washing the obtained precipitate with dilute nitric acid, water and absolute ethanol, dry it in air at 120~160℃ for 12-24h, and then in air calcining at 450-550 ℃ for 2-8 hours to obtain titanium-cerium-zirconium composite nanotubes as catalyst carriers;
[0038] S2. Catalyst mud preparation:
[0039] S2.1. respectively configure ammonium heptamolybdate and ...
Embodiment 1
[0050] The preparation process of the flat plate type wide temperature anti-sulfur and anti-alkali metal SCR denitration catalyst of the present embodiment is as follows:
[0051] (1) Under stirring conditions, add 1181g of cerium nitrate and 869g of zirconium oxychloride powder into 20L of concentrated ammonia water in turn, then slowly add 2040g of ascorbic acid and 4080g of sodium citrate and stir evenly, then slowly add 40L of tetrabutyl titanate containing 1852g The ethanol solution of the ester was stirred evenly, and then 150L of 5mol / L sodium hydroxide solution was added, and the reaction was carried out under the hydrothermal condition of 160℃ for 48h; After drying at ℃ for 24 h, and finally calcining at 450 ℃ for 8 h in air, titanium-cerium-zirconium composite nanotubes can be obtained.
[0052] (2) 183g of ammonium heptamolybdate, 76g of ferric nitrate and 8g of samarium sulfate were dissolved in 500ml, 300ml and 400ml of water respectively, and then the ammonium he...
Embodiment 2
[0057] The preparation process of the flat plate type wide temperature anti-sulfur and anti-alkali metal SCR denitration catalyst of the present embodiment is as follows:
[0058] (1) Under stirring conditions, add 1181g of cerium nitrate and 869g of zirconium oxychloride powder into 20L of concentrated ammonia water in turn, then slowly add 2040g of ascorbic acid and 4080g of sodium citrate and stir evenly, then slowly add 40L of tetrabutyl titanate containing 1852g The ethanol solution of the ester was stirred evenly, and then 150L of 5mol / L sodium hydroxide solution was added, and the reaction was carried out under the hydrothermal condition of 200℃ for 24h; After drying at ℃ for 12 h, and finally calcining at 550 ℃ for 2 h in air, titanium-cerium-zirconium composite nanotubes can be obtained.
[0059] (2) 119g of ammonium heptamolybdate, 152g of ferric nitrate and 30g of samarium sulfate were dissolved in 300ml, 400ml and 500ml of water respectively, and then the ammonium ...
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