Modified Y molecular sieve
A molecular sieve and modification technology, applied in the direction of octahedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of high activity and good coke selectivity, low utilization rate of rare earths, complex modification process, etc. , to achieve the effects of good structural acidity, optimized performance, and improved utilization
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[0023] Example 1:
[0024] Take 5 kg of NaY (dry basis), add 50 liters of deionized water, make a slurry, slowly add 5 liters of rare earth chloride solution under stirring, adjust the pH of the slurry to 4.5 with 3 mol / liter hydrochloric acid, and exchange at 30 °C for 0.5 hours. Then add 83.3 grams of diammonium hydrogen phosphate, continue to react for 1 hour, filter and wash with water, and the filter cake is calcined at 500 ° C and 80% water vapor for 1.5 hours to obtain the modified Y sub-sieve of the present invention. for P-1.
Example Embodiment
[0025] Example 2:
[0026] Take 5 kg of NaY (dry basis), add 40 liters of deionized water, make a slurry, slowly add 3.2 liters of rare earth chloride solution under stirring, adjust the pH of the slurry to 5.5 with 2 mol / liter hydrochloric acid, and exchange at 40 ° C for 50 minutes, Then add 83.3 grams of diammonium hydrogen phosphate, continue to react for 0.5 hours, filter, wash with water, and the filter cake is roasted at 550 ° C and 100% water vapor for 1 hour to obtain the modified Y sub-sieve of the present invention. for P-2.
Example Embodiment
[0027] Example 3:
[0028] Take 5 kg of NaY (dry basis), add 25 liters of deionized water, make a slurry, slowly add 5.0 liters of rare earth nitrate solution under stirring, adjust the pH of the slurry to 6.0 with 2 mol / liter hydrochloric acid, exchange at 20 ° C for 2 hours, and then Add 416.5 grams of ammonium dihydrogen phosphate, continue to react for 1 hour, filter and wash with water, and the filter cake is calcined at 350 ° C and 100% water vapor for 3 hours to obtain the "one-cross-one-bake" modified Y sub-sieve of the present invention, denoted as P-3.
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