Fly ash-based denitrification catalyst and its preparation method and denitrification method
A denitrification catalyst and fly ash technology, applied in the direction of catalyst activation/preparation, molecular sieve catalyst, chemical instruments and methods, etc., can solve the problems of secondary pollution, highly toxic vanadium, and high cost of denitrification, and achieve high added value, good Catalytic performance, the effect of improving the denitrification effect
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Embodiment 1
[0070] (1) Stir 10g of fly ash and 100mL of 2mol / L hydrochloric acid at 80°C for 2 hours to remove iron, filter, wash, and dry the filter cake at 95°C to obtain iron-removing fly ash. 3+ The content is 1.5mol / L.
[0071] (2) Mix the iron-removing fly ash, NaOH and water according to the mass ratio of 100:48:100, then carry out the alkali dissolution reaction at 100°C for 4 hours, and then filter the obtained product to obtain the desiliconization liquid, desiliconization The solution contains 51.5g / L SiO 2 , 7.9g / L Al 2 o 3 , 3.4mg / L Fe 2 o 3 ;
[0072] (3) Add 100ml of 2mol / L hydrochloric acid to 30ml of the desiliconization solution to adjust the pH of the desilication solution to 3; then add 43g of P123 to 1L of the desilication solution, and stir continuously at 35°C for 10h to prepare a synthetic mother solution;
[0073] (4) Put the synthetic mother liquor into a polytetrafluoroethylene-lined stainless steel reactor (Yantai Keli Chemical Equipment Co., Ltd. KH-100m...
Embodiment 2
[0081] (1) Stir 10g of fly ash and 100mL of 1mol / L sulfuric acid at 80°C for 2 hours to remove iron, filter and wash the filter cake at 95°C to obtain iron-removing fly ash. 3+ The content is 1.2mol / L.
[0082] (2) Mix the iron-removing fly ash, KOH and water according to the mass ratio of 100:67:100, then carry out the alkali dissolution reaction at 80°C for 6 hours, and then filter the obtained product to obtain the desiliconization liquid, desiliconization The solution contains 55g / L SiO 2 , 10g / L Al 2 o 3 , 3.0mg / L Fe 2 o 3 ;
[0083] (3) Add 100ml of 2mol / L HNO to 30ml of desiliconization solution 3 , adjust the pH of the desiliconization solution to 5; then add 53g of P123 to 1L of the desiliconization solution, and stir continuously at 35°C for 10h to prepare a synthetic mother solution;
[0084] (4) Put the synthetic mother liquor into a polytetrafluoroethylene-lined stainless steel reaction kettle, conduct hydrothermal crystallization reaction at 110°C and 6MPa...
Embodiment 3
[0092] (1) Stir 10g of fly ash and 100mL of 3mol / L hydrochloric acid at 80°C for 2 hours to remove iron, filter and wash with suction, and dry the filter cake at 95°C to obtain iron-removing fly ash. 3+ The content is 2mol / L.
[0093] (2) Mix the iron-removing fly ash, NaOH and water according to the mass ratio of 100:70:100, then carry out the alkali dissolution reaction at 95°C for 5 hours, and then filter the obtained product to obtain the desiliconization solution, which is analyzed and determined The desiliconization solution contains 51.5g / L SiO 2 , 7.9g / L Al 2 o 3 , 4.0mg / L of Fe 2 o 3 ;
[0094] (3) Add 50ml of 2mol / L H to 30ml of desiliconization solution 2 SO 4 , adjust the pH of the desiliconization solution to 3.5; then add 49g of P123 to 1L of the desiliconization solution, and stir continuously at 35°C for 10h to prepare a synthetic mother solution;
[0095] (4) Put the synthetic mother liquor into a polytetrafluoroethylene-lined stainless steel reaction ...
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