Denitration auxiliary agent with propylene yield increasing effect and preparation method thereof
A technology of nitration additives and propylene, which is applied in the field of denitrification additives and its preparation, can solve problems such as poor hydrothermal stability, high-temperature sintering of active metal oxides, and decreased activity of propylene, so as to reduce temperature difference, increase propylene yield, and use low cost effect
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Embodiment 1
[0050] Using ammonium dihydrogen phosphate to H-ZSM-5 molecular sieve (SiO 2 / Al 2 o 3 The molar ratio is 27), impregnated and flash-dried, and then roasted at 550 ° C for 2 hours to obtain phosphorus-containing ZSM-5 molecular sieves, and the P in the obtained molecular sieves 2 o 5 The content is 3.2wt%.
[0051] Cerium nitrate solution (containing 0.95 kg CeO 2 ) and 3.0 kilograms (dry basis) of phosphorus-containing ZSM-5 molecular sieves were added to 4 kilograms of deionized water, and stirred at high speed for 30 minutes to obtain phosphorus-containing MFI molecular sieve slurry.
[0052] Under stirring conditions, add 2.7 kg (dry basis) of kaolin and 0.9 kg (dry basis) of aluminum sol into 4 kg of deionized water, and stir at high speed for 2 hours. After the kaolin is completely dispersed in the slurry, add 1.8 kg (dry basis) ) Pseudo-boehmite, the pH of the slurry is adjusted to 2.5-3.5 by HCl, so that the pseudo-boehmite undergoes gelation reaction. After stir...
Embodiment 2
[0055] Using ammonium dihydrogen phosphate to H-ZSM-5 molecular sieve (SiO 2 / Al 2 o 3 The molar ratio is 27), impregnated and flash-dried, and then roasted at 550 ° C for 2 hours to obtain phosphorus-containing ZSM-5 molecular sieves, and the P in the obtained molecular sieves 2 o 5 The content is 3.2wt%.
[0056] Cerium chloride solution (containing 0.6 kg CeO 2 ) and 3.0 kilograms (dry basis) of phosphorus-containing ZSM-5 molecular sieves were added to 4 kilograms of deionized water, and stirred at high speed for 30 minutes to obtain phosphorus-containing MFI molecular sieve slurry.
[0057] Under stirring conditions, add 2.3 kg (dry basis) of kaolin and 0.9 kg (dry basis) of aluminum sol into 4 kg of deionized water, and stir at high speed for 2 hours. After the kaolin is completely dispersed in the slurry, add 2.2 kg (dry basis) ) Pseudo-boehmite, the pH of the slurry is adjusted to 2.5-3.5 by HCl, so that the pseudo-boehmite undergoes gelation reaction. After stir...
Embodiment 3
[0060] Utilize phosphoric acid to H-ZSM-5 molecular sieve (SiO 2 / Al 2 o 3 The molar ratio is 50), impregnated and flash-dried, and then roasted at 550 ° C for 2 hours to obtain phosphorus-containing ZSM-5 molecular sieves, and the P in the obtained molecular sieves 2 o 5 The content is 0.5wt%.
[0061] Cerium carbonate (containing 0.6 kg CeO 2 ) and 4.25 kilograms (dry basis) of phosphorus-containing ZSM-5 molecular sieves were added to 6 kilograms of deionized water, and stirred at high speed for 30 minutes to obtain phosphorus-containing MFI molecular sieve slurry.
[0062]Under the condition of stirring, add 1.6 kg (dry basis) of kaolin and 0.9 kg (dry basis) of aluminum sol into 4 kg of deionized water and stir at high speed for 2 hours. After the kaolin is completely dispersed in the slurry, add 1.8 kg (dry basis) ) Pseudo-boehmite, the pH of the slurry is adjusted to 2.5-3.5 by HCl, so that the pseudo-boehmite undergoes gelation reaction. After stirring for 30 min...
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