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A mesoporous-rich molecular sieve and preparation method thereof

A molecular sieve, mesoporous technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as low micropore volume

Active Publication Date: 2019-12-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • 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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  • A mesoporous-rich molecular sieve and preparation method thereof

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[0030] The present disclosure also provides a preparation method of the mesoporous-rich Y molecular sieve provided in the present disclosure, the preparation method comprising: a. performing ammonium exchange treatment on the NaY molecular sieve, followed by filtration and washing to obtain the ammonium exchange molecular sieve; Wherein, based on sodium oxide and based on the dry weight of the ammonium exchanged molecular sieve, the sodium oxide content of the ammonium exchanged molecular sieve is less than 5% by weight; b, roasting the ammonium exchanged molecular sieve obtained in step a to obtain roasted Molecular sieve; c, the roasted molecular sieve obtained in step b is subjected to dealumination and silicon supplementation treatment under anhydrous conditions using silicon tetrachloride gas to obtain a dealumination silicon supplementation molecular sieve; d, the dealumination silicon supplementation molecular sieve obtained in step c is processed by Carry out the first ...

Embodiment 1

[0052] 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 oxide content of the molecular sieve was measured to be less than 5% by weight. The obtained molecular sieves were calcined at 600° C. for 2 h. Take the calcined molecular sieve in an anhydrous dry environment, pass through SiCl 4 Saturated dry gas, the reaction temperature is 550°C, and the reaction time is 2h; take 100g (dry basis mass) of the obtained molecular sieve and add water to prepare a molecular sieve slurry with a solid content of 10% by weight, add 3g of citric acid during stirring, and then add 400g of hydrochloric acid (mass fraction 10%), the addition time was 30min; the temperature was raised to 75°C and stirred for 1h, filtered and washed until the filtrate was neutral; the sample ...

Embodiment 2

[0070] 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 oxide content of the molecular sieve was measured to be less than 5% by weight. The obtained molecular sieves were calcined at 550° C. for 3 h. Take the calcined molecular sieve in an anhydrous dry environment, pass through SiCl 4 Saturated dry gas, the reaction temperature is 550°C, and the reaction time is 2h; take 100g (dry basis mass) of the obtained molecular sieve 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% by weight) %), the addition time is 30 minutes; the temperature is raised to 30° C. and stirred at a constant temperature for 2 hours, filtered and washe...

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Abstract

The invention discloses a mesopore-rich Y molecular sieve and a preparation method thereof, wherein the unit cell parameters of the molecular sieve is 24.35-24.55 angstrom, the relative crystallinityis more than or equal to 90%, the Al distribution parameter D of the molecular sieve is more than or equal to 0.3 and is less than or equal to 0.8, the micropore specific surface area of the molecularsieve is 650-800 m<2> / g, the volume of the mesopores of the molecular sieve accounts for 20-65% of the total pore volume, a ratio of the peak area of the resonance signal with the chemical shift of 60+ / -2 ppm to the peak area of the resonance signal with the chemical shift of 55+ / -2 ppm in the 27Al MAS NMR spectrum of the molecular sieve is (1.5-5):1, and the peak area of the resonance signal with the chemical shift of 0+ / -2 ppm accounts for not more than 5% of the total peak area. According to the present invention, the catalyst prepared by using the mesopore-rich Y molecular sieve as the active component has advantages of excellent heavy oil conversion capability, high gasoline yield and high liquefied gas yield in the catalytic cracking of heavy oil.

Description

technical field [0001] The present disclosure relates to a mesoporous-rich 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 polycyclic aromatic hydrocarbo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24B01J29/08B01J35/10C10G11/05
CPCB01J29/084B01J35/1019B01J35/1023B01J2029/081B01J2229/16B01J2229/40C01B39/24C01P2002/77C01P2006/12C01P2006/14C10G11/05C10G2300/1037C10G2300/70C10G2400/02
Inventor 欧阳颖庄立刘建强罗一斌舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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