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Super-stable Y-type molecular sieve containing phosphorus and rare earth, and preparation method thereof

A molecular sieve and rare earth technology, applied in molecular sieve catalysts, chemical instruments and methods, processing hydrocarbon oil, etc., can solve the problems of low crystallinity retention rate and specific surface area retention rate, low catalyst cracking activity, and low heavy oil cracking activity, etc. Achieve the effect of low coke selectivity, high stability and low content

Active Publication Date: 2018-08-28
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rare earth-containing high-silicon Y-type zeolite can be prepared by performing multiple rare-earth ion exchanges and multiple high-temperature roasting on NaY zeolite. The disadvantages of zeolite are: because too harsh hydrothermal treatment conditions will destroy the structure of zeolite, Y-type zeolite with high silicon-alumina ratio cannot be obtained; although the production of aluminum outside the framework is very important for improving the stability of zeolite and forming new acid centers Beneficial, but too much aluminum outside the framework reduces the selectivity of zeolite; in addition, many dealuminated holes in zeolite cannot be filled by silicon migrated from the framework in time, often resulting in lattice defects of zeolite, and the crystallization of zeolite remains Therefore, the thermal and hydrothermal stability of the rare earth-containing high-silicon Y-type zeolite prepared by the hydrothermal method is relatively poor, which is manifested in the low lattice collapse temperature, the crystallinity retention rate and the ratio of crystallinity after hydrothermal aging. low surface area retention
The cracking activity of the catalyst made of the zeolite as the active component is not high, and the conversion rate of heavy oil is low
[0012] However, the existing ultra-stable Y-type molecular sieves containing phosphorus and rare earths have low heavy oil cracking activity and poor coke selectivity.

Method used

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  • Super-stable Y-type molecular sieve containing phosphorus and rare earth, and preparation method thereof
  • Super-stable Y-type molecular sieve containing phosphorus and rare earth, and preparation method thereof
  • Super-stable Y-type molecular sieve containing phosphorus and rare earth, and preparation method thereof

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Embodiment approach

[0041] In one embodiment, the phosphorus modification treatment conditions are as follows: adding the Y-type molecular sieve powder sample with reduced unit cell constant to the exchange solution containing phosphorus compounds, and performing an exchange reaction at 15-100°C for 10-100 °C. Minutes, filter, wash; Wherein, the weight ratio of the water in the exchange liquid and molecular sieve is 2~5, preferably 3~4, phosphorus (in P 2 o 5 The weight ratio of the molecular sieve to the molecular sieve is: 0.0005~0.10, preferably 0.001~0.05.

[0042] In step (3), the calcined molecular sieve is also dried, so that the water content in the Y-type molecular sieve with reduced unit cell constant is preferably not more than 1% by weight. The drying can adopt existing methods, such as airflow drying, oven drying, and flash drying.

[0043] In the preparation method of modified Y-type molecular sieve provided by the present invention, in step (4), SiCl 4 : the weight ratio of Y ty...

Embodiment 1

[0056] Get 2000 grams of NaY molecular sieves (calculated on a dry basis) and add them to 20 liters of decationized aqueous solution and stir to make them evenly mixed. Add 600ml of RE(NO 3 ) 3 Solution (rare earth solution concentration is RE 2 o 3 Calculated as 319g / L), stirred, heated to 90-95°C and kept for 1 hour, then filtered, washed, and the filter cake was dried at 120°C to obtain a unit cell constant of 2.471nm and a sodium oxide content of 7.0% by weight. 2 o 3 A Y-type molecular sieve with a total rare earth content of 8.8% by weight is then calcined for 6 hours at a temperature of 390°C in an atmosphere containing 50% by volume of water vapor and 50% by volume of air to obtain a Y-type molecular sieve with a unit cell constant of 2.455nm. After cooling, Add molecular sieves to 6 liters of aqueous solution containing 35 grams of phosphoric acid, raise the temperature to 90°C, and perform phosphorus modification treatment for 30 minutes. After that, filter and wa...

Embodiment 2

[0059] Get 2000 grams of NaY molecular sieves (on a dry basis) and add them to 25 liters of decationized aqueous solution and stir to make them evenly mixed. Add 800 ml of RECl 3 solution (in RE 2 o 3 The calculated solution concentration is: 319g / L), stirred, heated up to 90-95°C for 1 hour, then filtered, washed, and the filter cake was dried at 120°C to obtain a unit cell constant of 2.471nm and a sodium oxide content of 5.5% by weight , with RE 2 o 3 A Y-type molecular sieve with a total rare earth content of 11.3% by weight was then calcined at a temperature of 450° C. under 80% water vapor for 5.5 hours to obtain a Y-type molecular sieve with a unit cell constant of 2.461 nm. After cooling, the molecular sieve was added to a solution containing 268 grams of In 6 liters of ammonium phosphate aqueous solution, the temperature was raised to 60°C, and the phosphorus modification treatment was carried out for 50 minutes. After that, the molecular sieve was filtered and was...

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Abstract

The invention relates to a super-stable Y-type molecular sieve containing phosphorus and rare earth, wherein the Y-type molecular sieve contains 4-11 wt% of rare earth, 0.05-10 wt% of phosphorus and 0.1-0.7 wt% of sodium oxide, and has the pore volume of 0.33-0.39 mL / g, the pore volume of the pores with the pore size of 2-100 nm accounts for 15-30% of the total pore volume, the unit cell constantis 2.440-2.455 nm, the non-framework aluminum accounts for less than 20% of the total aluminum, the lattice collapse temperature is more than 1050 DEG C, and a ratio of the amount of B acid to the amount of L acid is not less than 2.50. The preparation method comprises: preparing a rare earth-containing Y-type molecular sieve having a conventional unit cell size, calcining for 4.5-7 h at a temperature of 350-480 DEG C under 30-90% by volume of steam atmosphere, carrying out phosphorus modification treatment, and carrying out a contact reaction with silicon tetrachloride gas. According to the present invention, the Y-type molecular sieve has advantages of good hydrothermal stability, high heavy oil conversion activity, low coke selectivity, high heavy oil conversion diesel yield, high liquefied gas yield and high total liquid recovery.

Description

technical field [0001] The invention relates to an ultra-stable Y-type molecular sieve containing phosphorus and rare earth and a preparation method thereof. Background technique [0002] At present, the industrial production of high-silicon Y-type zeolite mainly adopts the hydrothermal method. Rare earth-containing high-silicon Y-type zeolite can be prepared by performing multiple rare-earth ion exchanges and multiple high-temperature roasting on NaY zeolite. The disadvantages of zeolite are: because too harsh hydrothermal treatment conditions will destroy the structure of zeolite, Y-type zeolite with high silicon-alumina ratio cannot be obtained; although the production of aluminum outside the framework is very important for improving the stability of zeolite and forming new acid centers Beneficial, but too much aluminum outside the framework reduces the selectivity of zeolite; in addition, many dealuminated holes in zeolite cannot be filled by silicon migrated from the f...

Claims

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Application Information

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IPC IPC(8): B01J29/08B01J35/10C10G11/05
CPCC10G11/05B01J29/088B01J2229/18B01J2229/14C10G2300/1055C10G2400/02B01J35/617B01J35/633
Inventor 周灵萍张蔚琳许明德张杰潇田辉平朱玉霞
Owner CHINA PETROLEUM & CHEM CORP
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