Phosphorus-containing and rare earth-containing Y molecular sieve and preparation method thereof

A molecular sieve and rare earth technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, molecular sieves and alkali exchange compounds, etc., can solve the problem of low micropore volume, reduce olefin content, increase heavy oil conversion rate, and reduce coke yield. Effect

Active Publication Date: 2018-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Y molecular sieve prepared by this method has ultra-high mesoporous content, but low micropore volume

Method used

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  • Phosphorus-containing and rare earth-containing Y molecular sieve and preparation method thereof
  • Phosphorus-containing and rare earth-containing Y molecular sieve and preparation method thereof

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[0039] The present disclosure also provides a method for preparing the phosphorus- and rare-earth-containing Y molecular sieve provided by the present disclosure. The preparation method includes: a. NaY molecular sieve is subjected to ammonium exchange treatment, and after filtering and washing, ammonium exchange Molecular sieve; wherein, based on the dry weight of the ammonium exchanged molecular sieve based on sodium oxide, the sodium oxide content of the ammonium exchanged molecular sieve is less than 5% by weight; Carry out the first hydrothermal calcination treatment in step b to obtain the hydrobaked molecular sieve; c, the hydrobaked molecular sieve obtained in step b is subjected to the first dealumination treatment in the acid solution composed of organic acid and inorganic acid, and after filtering and washing, Obtain the first dealuminated molecular sieve; d, carry out alkali treatment on the first dealuminated molecular sieve obtained in step c in an inorganic alkal...

Embodiment 1

[0066] Y molecular sieve (produced by Catalyst Qilu Branch, unit cell parameter 24.63 angstroms) and NH 4 Cl and distilled water were mixed and beaten evenly at a ratio of 1:1:10, ammonium was exchanged at 70°C for 1 hour, the sample was filtered, washed, and dried, and the sodium content of the molecular sieve was determined to be less than 5% by weight. The above-mentioned molecular sieves were calcined at 600° C. and 100% steam for 2 hours. Take 100 g (dry basis mass) of the roasted molecular sieve and add water to prepare a molecular sieve slurry with a solid content of 10% by weight, add 3 g of citric acid during stirring, and then add 400 g of hydrochloric acid (mass fraction 10%) for 30 minutes; heat up to a constant temperature of 75 ° C Stir for 1 h, filter and wash until the filtrate is neutral; add water to the filter cake and beat to obtain a molecular sieve slurry with a solid content of 10% by weight, add 10.42 g of NaOH (purity 96%), heat up to 50 ° C and stir a...

Embodiment 2

[0074] Y molecular sieve (produced by Catalyst Qilu Branch, unit cell parameter 24.63 angstroms) and NH 4 Cl and distilled water were mixed and beaten evenly at a ratio of 1:1:10, ammonium was exchanged at 70°C for 1 hour, the sample was filtered, washed, and dried, and the sodium content of the molecular sieve was determined to be less than 5% by weight. The above-mentioned molecular sieves were calcined at 600° C. and 100% steam for 2 hours. Take 100g of roasted molecular sieve (mass on a dry basis) and add water to prepare a molecular sieve slurry with a solid content of 10% by weight, add 5g of oxalic acid during stirring, and then add 200g of sulfuric acid (mass fraction 10%) for 30 minutes; heat up to 30°C and stir at a constant temperature 2h, filter and wash until the filtrate is neutral; add water and beat the filter cake to obtain a molecular sieve slurry with a solid content of 10% by weight, add 31.25g KOH (purity 96%), heat up to 70°C and stir at a constant temper...

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Abstract

The invention discloses a phosphorus-containing and rare earth-containing Y molecular sieve and a preparation method thereof, wherein the unit cell parameter of the molecular sieve is 24.35-24.55 angstrom, the phosphorus content (calculated as P2O5) of the molecular sieve is 0.3-10.0 wt% by using the dry base weight of the molecular sieve as the reference, the rare earth content (calculated as RE2O3) of the molecular sieve is 0.5-19 wt% by using the dry base weight of the molecular sieve as the reference, the Al distribution parameter D of the molecular sieve is more than or equal to 0.4 and is less than or equal to 0.9, the volume of the mesopores of the molecular sieve accounts for 25-65% of the total pore volume, the amount of the strong acid of the molecular sieve accounts for 65-78% of the total acid amount, and a ratio of the acid B to the acid L is 21-98. According to the present invention, the catalyst prepared by using the phosphorus-containing and rare earth-containing Y molecular sieve as the active component can have advantages of excellent heavy oil conversion capacity, high gasoline yield, low coke yield and low olefin content in gasoline in the heavy oil cracking reaction.

Description

technical field [0001] The present disclosure relates to a phosphorus- and rare earth-containing Y molecular sieve and a preparation method thereof. Background technique [0002] Molecular sieves are widely used in catalysis, adsorption and separation due to their shape-selective properties, high specific surface area and strong acidity. Molecular sieve Y (HY, REY, USY) has been the main active component of catalytic cracking (FCC) catalysts since it was first used in the 1960s. However, with the intensification of heavy crude oil, the content of polycyclic compounds in FCC feedstock increases significantly, while the diffusion capacity of FCC feedstock in the pores of molecular sieves decreases significantly. And the Y molecular sieve pore diameter as main cracking group member only has 0.74nm, is used for processing the heavy distillate such as residual oil, the accessibility of catalyst active center will become wherein contained polycyclic compound (for example polycycl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24B01J29/08
CPCB01J29/088C01B39/026C01B39/24C01P2006/14C01P2006/16C01P2006/17
Inventor 庄立刘建强欧阳颖罗一斌舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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