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

Active Publication Date: 2010-09-08
PETROCHINA CO LTD
4 Cites 58 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, the disadvantage of the existing technology is that the modification process is complex, such as the super-stabilization of molecular sieves and the phosphorus modification pro...
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Abstract

The invention discloses a modified Y molecular sieve, which is prepared by performing a primary exchange reaction on a NaY molecular sieve and rare earth solution, then introducing a phosphorus compound into an exchange serous fluid for further reaction, filtering and washing the mixture after the reaction, and roasting a filter cake under a vapor condition. The lattice constant of the modified Y molecular sieve is 2.450 to 2.479 nanometers, and the modified Y molecular sieve comprises the following components in percentage by weight: 2.0 to 6.0 percent of sodium oxide, 0.01 to 2.5 percent of phosphorus and 11 to 23 percent of rare earth oxide. Most of the rare earth of the modified molecular sieve is positioned in a sodalite cage of the Y molecular sieve, so the stability of the molecular sieve in a high-temperature hydrothermal environment is increased; and the structural acidity of the molecular sieve plays a good role in modulation. The modified Y molecular sieve used as an active component of a cracking catalyst has strong heavy oil conversion capacity and good coke selectivity.

Application Domain

Faujasite aluminosilicate zeolite

Technology Topic

Examples

  • Experimental program(5)
  • Comparison scheme(2)
  • Effect test(1)

Example Embodiment

[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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PUM

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Description & Claims & Application Information

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