Y/MCM-48 composite molecular screen and preparation method thereof

A composite molecular sieve, MCM-48 technology, applied in the direction of molecular sieves and alkali exchange compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of narrow formation phase area, uneconomical, harsh formation conditions, etc., and achieve the goal of reducing production costs Effect

Inactive Publication Date: 2008-05-28
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of them are limited to the composite of MCM-41 with one-dimensional straight channels and micropores, and are synthesized with a single surfactant as a template, which only solves the problem of presence or absence, and does not realize the content of microporous phase in composite molecular sieves. Controllable Synthesis of Framework Si/Al
Another important member of the MCM41S series, the three-dimensional double-helical channel MCM-48, has better diffusion performance than the one-dimensional straight channel MCM-41, but it is difficult to synthesize because of its narrow formation phase region and harsh formation condit...

Method used

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  • Y/MCM-48 composite molecular screen and preparation method thereof
  • Y/MCM-48 composite molecular screen and preparation method thereof
  • Y/MCM-48 composite molecular screen and preparation method thereof

Examples

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Effect test

example 1

[0025] Add 0.88g of finely ground Y zeolite powder to the mixed solution of CTAB and θP-10, stir quickly for 30min, and then add 5.7ml water glass (25.4wt% SiO 2 , 7.47wt%NaO 2 , 67.29wt%H 2O), stir at 30℃ for 2h to obtain a uniformly mixed starting gel with a molar composition ratio of 1 SiO 2 :0.15 CTAB: 0.025 OP-10: 0.28Na 2 O: 59 H 2 O, Y zeolite / SiO 2 (Mass ratio)=0.44. Adjust the PH≈10.6, put the sol into a 40ml reactor, crystallize at 100°C for 72h, and finally the product is filtered, washed, and dried to obtain Y / MCM-48 composite molecular sieve.

example 2

[0027] Add 1.76g of finely ground Y zeolite powder to the mixed solution of CTAB and OP-10, stir quickly for 30 minutes, and then add 5.7ml of water glass (25.4wt% SiO 2 , 7.47wt%NaO 2 , 67.29wt%H 2 O), stir at 40℃ for 1h to obtain a uniformly mixed starting gel with a molar composition ratio of 1 SiO 2 :0.15 CTAB: 0.025 OP-10: 0.28Na 2 O: 59 H 2 O, Y zeolite / SiO 2 (Mass ratio)=0.88. Adjust PH≈9, put the sol into a 40ml reactor, crystallize at 125°C for 12h, and finally the product is filtered, washed, and dried to obtain Y / MCM-48 composite molecular sieve.

example 3

[0029] Add 0.88g of finely ground Y zeolite powder to the mixed solution of CTAB and OP-10, stir quickly for 30 minutes, and then add 5.7ml of water glass (25.4wt% SiO 2 , 7.47wt%NaO 2 , 67.29wt%H 2 O), stir at 20℃ for 3h to obtain a uniformly mixed starting gel with a molar composition ratio of 1 SiO 2 : 0.17 CTAB: 0.020 OP-10: 0.20Na 2 O: 59 H 2 O, Y zeolite / SiO 2 (Mass ratio)=0.44. Adjust PH≈12, put the sol into a 40ml reaction kettle, crystallize at 75°C for 96h, and finally the product is filtered, washed, and dried to obtain Y / MCM-48 composite molecular sieve.

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Abstract

The invention relates to a catalytic material of a composite molecular sieve containing micropore Y-zeolite phase and mediated hole MCM- 48 phase, which is produced by taking mixed cationic and non-ion surfactant as template; the invention also relates to a preparation method of the catalytic material. By adopting a method of overgrowth and employing mixed aqueous solution of cationic surfactant: cetylíítrimethyl ammonium bromide(CTAB) and nonionic surfactant: p -octyl polyethylene phenyl ether OP-10 as template, under the alkaline hydrothermal condition the invention synthesizes composite molecular sieve which is provided with Y/MCM-48 with micropore and two-mode mediated holes. The framework ratio Si/Al of microporous phase Y-zeolite of the composite molecular sieve is higher than traditional Y-zeolite, and the ratio Si/Al and the content of the framework of microporous phase can be adjusted by changing synthesis conditions. The method of the invention has simple operation and good repeatability, which provides with optional materials for developing novel catalyst with industrial application prospect, and the synthesis has practical application value.

Description

Technical field [0001] The invention relates to a kind of composite molecular sieve catalyst material prepared by using a mixed cationic-nonionic surfactant as a template and simultaneously containing a microporous Y zeolite phase and a mesoporous MCM-48 phase and a preparation method thereof. Background technique [0002] Since the advent of synthetic microporous molecular sieves in the 1960s, microporous molecular sieves have played a very important role in acid-catalyzed reactions due to their uniform pore structure and strong acidity, creating huge wealth for mankind. The mainstay of the development of petrochemical industry, but with the demand of heavy oil products and the reaction of medicine and biological macromolecules, the narrow pores of microporous molecular sieve limit its application. The emergence of mesoporous molecular sieve has brought dawn to the application of heavy oil and macromolecules, but its weak acidity and hydrothermal instability caused by the disord...

Claims

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Application Information

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IPC IPC(8): C01B39/00C01B39/24
Inventor 王义薛志元李全芝
Owner FUDAN UNIV
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