Amorphous composite oxide denitration catalyst and preparation method and use thereof
A composite oxide and denitrification catalyst technology, which is applied in the field of amorphous composite oxide denitration catalyst and its preparation, can solve the problems of low poisoning ability, low catalytic activity, and unsuitability for long-term use, and achieve low cost, high catalytic activity, easy access to effects
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Embodiment 1
[0034] Weigh 2.5395 g Ce(NO 3 ) 3 ·6H 2 O and 4.8004 g Ti(SO 4 ) 2 Dissolve completely in 100 mL deionized water. Under vigorous stirring, an appropriate amount of ammonia water was slowly dropped into the above solution to pH = 10, and a large amount of yellow precipitate was formed, which was aged at room temperature for 48 h. Remove the supernatant, wash the precipitate with deionized water several times until there is no sulfate group (check the filtrate with barium chloride solution), filter it with suction, dry it in an oven at 100°C for 12 hours, and roast it in air at 500°C for 6 hours to obtain a solid catalyst 1. Crushed samples were screened into 40-60 mesh particles for denitrification performance test, 100000 h -1 Airspeed results are shown in Table 1, 25000 h -1 The airspeed results are shown in Table 2.
[0035] The metal composite oxide catalyst of the present invention is amorphous, and its amorphous structure can be verified by X-ray powder diffracti...
Embodiment 2
[0037] Weigh 0.0508 g of ammonium tungstate and 0.0242 g of oxalic acid and dissolve them in 5 mL of warm water to prepare ammonium tungstate impregnation solution. Catalyst 1 obtained in Example 1 was ground into powder, 0.4 g was immersed in the above impregnation solution, and dispersed by ultrasonic for 10 min. Then heated and stirred at 75°C to evaporate the water to dryness, dried at 100-120°C for 10-15 h, and calcined at 500°C for 2 h in air to obtain solid catalyst 2. The crushed samples were sieved into 40-60 mesh particles for the denitrification performance test, and the results are shown in Table 1.
[0038]
[0039] As can be seen from the above table, the catalytic activity of the catalyst of the present invention is within 100000 h -1 At high space velocity, the range of 200-400°C is better, especially the range of 250-400°C has the best catalytic activity, which can reach more than 90%. In addition, in Example 2, the catalyst effect of adding additives is ...
Embodiment 3
[0041] Weigh 1.4024 g SnCl 4 ·5H 2 O, 2.5395 g Ce(NO 3 ) 3 ·6H 2 O and 3.8403 g Ti(SO 4 ) 2 Dissolve completely in 100 mL deionized water. Under vigorous stirring, an appropriate amount of ammonia water was slowly dropped into the above solution to pH=9-10, a large amount of yellow precipitate was formed, and the obtained precipitate was aged at room temperature for 48 h. Remove the supernatant, wash the precipitate with deionized water several times until there are no chloride ions and sulfate groups (test the filtrate with silver nitrate and barium chloride solution respectively), put it into an oven for 12-15 hours at 100-120°C to dry after suction filtration, and air Solid catalyst 3 was prepared by activation at 500 °C for 6 h. The crushed samples were sieved into 40-60 mesh particles for the denitrification performance test, and the results are shown in Table 2.
[0042]
[0043] As can be seen from the above table, at 25000h -1 At the space velocity, the ca...
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