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A kind of modified y/zsm-48 composite molecular sieve and its preparation method and application

A technology of ZSM-48 and composite molecular sieve, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve the effects of reducing the content of linear alkanes, good catalytic activity and diffusion performance, and favorable ring-opening performance

Active Publication Date: 2020-02-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pore size of the prepared secondary pore structure is mainly concentrated in 3~5nm, and it is still powerless for the conversion of some aromatic hydrocarbon macromolecules with two rings and above. Therefore, the preparation of molecular sieves with larger pore structures is a very important scientific research direction.

Method used

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  • A kind of modified y/zsm-48 composite molecular sieve and its preparation method and application
  • A kind of modified y/zsm-48 composite molecular sieve and its preparation method and application
  • A kind of modified y/zsm-48 composite molecular sieve and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Roast the Y-type molecular sieve at 550°C for 4 hours, and then completely impregnate the roasted Y-type molecular sieve in liquid C under the condition of 0.3MPa 10 h 18 in a nitrogen atmosphere for 2 hours, and then roasted at 500°C for 2 hours to carry out the carbon deposition reaction, and then put the Y-type molecular sieve after the carbon deposition in a 0.50mol / L sodium hydroxide solution (the amount of the molecular sieve added and the solution The mass ratio of medium water is 1:8) and treated at 70°C for 2.0 hours, and washed until the pH value is less than 10 to obtain a modified Y-type molecular sieve;

[0033] (2) Add the modified Y-type molecular sieve powder into the solution containing sodium hydroxide and hexamethyldiammonium bromide, age at 80°C for 3 hours under airtight conditions, add white carbon black, and continue to stir to obtain the reaction mixture. Glue system, the reaction mixture was crystallized at 170°C for 3 days under airtight c...

Embodiment 2

[0036] (1) Roast the Y-type molecular sieve at 450°C for 6 hours, and then completely impregnate the roasted Y-type molecular sieve in liquid C under the condition of 0.4MPa 8 h 14 in a nitrogen atmosphere for 1 hour, and then roasted at 550°C for 2 hours in a nitrogen atmosphere to carry out the carbon deposition reaction, and then put the Y-type molecular sieve after the carbon deposition in a 0.80mol / L sodium hydroxide solution (the amount of molecular sieve added and the solution The mass ratio of reclaimed water is 1:15) and treated at 80°C for 1.5 hours, and washed until the pH value is less than 10 to obtain a modified Y-type molecular sieve;

[0037] (2) Add the modified Y-type molecular sieve powder into the solution containing sodium hydroxide and hexamethyldiammonium chloride, age at 120°C for 1.0 hour under airtight conditions, add white carbon black, and continue to stir to obtain the reaction mixture. Glue system, the reaction mixture was crystallized at 160°C f...

Embodiment 3

[0040] Steps (1) and (2) are the same as in Example 1.

[0041](3) Under stirring conditions, mix the hydrogen-type Y / ZSM-48 composite molecular sieve and tetraethylammonium hydroxide solution in a high-pressure reactor, feed nitrogen to control the system pressure at 0.25MPa, and then raise the temperature to 70°C, Continue stirring at constant temperature for 3 hours, release the pressure, cool, filter with suction until the pH value is less than 9, dry at 100°C for 24 hours, and roast at 520°C for 6 hours to obtain a modified Y / ZSM-48 composite molecular sieve. The concentration of tetraethylammonium hydroxide solution is 0.10mol / L, and the mass ratio of hydrogen Y / ZSM-48 composite molecular sieve to water in the solution is 1:10. The specific properties are shown in Table 1.

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Abstract

The invention discloses a modified Y / ZSM-48 composite molecular sieve as well as a preparation method and application thereof. The modified Y / ZSM-48 composite molecular sieve has the following properties: the total hole volume is 0.46 to 0.85ml / g, and is preferably 0.50 to 0.80ml / g; the mesopore hole volume is 0.35 to 0.65ml / g, and is preferably 0.40 to 0.60ml / g; the mesopore hole volume accounts for 55 percent to 90 percent, preferably 60 percent to 80 percent of the total hole volume; the molar ratio of silicon oxide and aluminum oxide is 10 to 35, and is preferably 12 to 30; the specific surface area is 480 to 850m<2> / g, and is preferably 550 to 800m<2> / g. The modified Y / ZSM-48 composite molecular sieve has mesopore distribution with a larger size, can provide more reaction spaces for macromolecules, and is beneficial to improving a catalytic performance of the molecular sieve, simple in the preparation method, and applicable to industrial application.

Description

technical field [0001] The invention relates to a modified Y / ZSM-48 composite molecular sieve and its preparation method and application. Background technique [0002] For a long time, the modification of molecular sieves has been widely concerned by researchers. The research on the modification of molecular sieves is mainly through conventional acid, alkali and hydrothermal treatment modification to carry out desilication and dealumination, and at the same time produce a large number of secondary mesoporous structures. The resulting large number of secondary pores facilitate the reaction and diffusion of macromolecules. The current modification methods are mainly hydrothermal treatment at a certain temperature and then acid treatment, which not only deals with the molecular sieve, improves the hydrothermal stability, but also produces a large number of secondary pore structures. However, the secondary pores of the molecular sieve prepared by this method are mainly concent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80C10G47/16
CPCB01J29/80B01J35/1019B01J35/1023B01J35/1038B01J35/1042B01J2229/38C10G47/16C10G2300/70
Inventor 秦波杜艳泽柳伟高杭张晓萍
Owner CHINA PETROLEUM & CHEM CORP
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