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Straight through mesoporous zsm-5 molecular sieve and preparation method thereof

A ZSM-5 and mesoporous molecular sieve technology, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problem of high cost, poor straight-through, and mesoporous ZSM-5 molecular sieve crystallinity Low-level problems, to achieve good technical results and reduce costs

Active Publication Date: 2020-11-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is the problems of high cost, low crystallinity and poor straight-through property of the obtained mesoporous ZSM-5 molecular sieve in the prior art, and a new straight-through mesoporous ZSM-5 molecular sieve and its preparation method are provided

Method used

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  • Straight through mesoporous zsm-5 molecular sieve and preparation method thereof
  • Straight through mesoporous zsm-5 molecular sieve and preparation method thereof
  • Straight through mesoporous zsm-5 molecular sieve and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The preparation of straight-through mesoporous ZSM-5 molecular sieve is carried out according to the following steps: first prepare ZSM-5 water-in-oil microemulsion, the aqueous solution of tetrapropylamine hydroxide (TPAOH) and tri-n-octylamine is the microemulsion water phase, orthosilicon The toluene solution of ethyl acetate (TEOS) and aluminum isopropoxide is the oil phase, and the clear microemulsion I is obtained by mixing the two phases of water and oil. The molar ratio of Si:Al:TPAOH in microemulsion I is 20:1:5; the molar ratio of toluene and tri-n-octylamine to water is 2:1:1; Precursor II was obtained by impregnating -15 at a mass ratio of 0.5:1. After aging at 60°C for 1 hour, the precursor II was put into a stainless steel reactor, and crystallized at 150°C for 24 hours to obtain a mesoporous ZSM-5 molecular sieve containing a template. After the product is taken out, it is calcined at 550°C for 6 hours to obtain a straight-through mesoporous ZSM-5 molecu...

Embodiment 2-6

[0035] According to the method of Example 1, only by changing the type of mesoporous molecular sieve, the mesopore and micropore distribution of the straight-through mesoporous ZSM-5 molecular sieve can be adjusted to obtain straight-through mesoporous ZSM-5 molecular sieves with different mesopore / micropore void ratios. 5 molecular sieves.

[0036] The mesoporous MCM series can be synthesized by conventional technical means in the field.

Embodiment 7-12

[0038] According to the method of Example 1, the straight-through mesoporous ZSM-5 molecular sieves with different silicon-aluminum ratios can be obtained only by changing the silicon-aluminum ratio of the microemulsion.

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Abstract

The invention relates to a through mesoporous ZSM-5 molecular sieve and a preparation method thereof, and mainly solves the problems that when the prior art is used to prepare a ZSM-5 molecular sievewith mesopores, the micropore-mesopore channels cannot be fully through, and the mesopore channels collapse easily and the like. According to the invention, through the adoption of a secondary treatment method, a micro-emulsion rich in silicon / aluminum / ZSM-5 template is impregnated in a mesoporous molecular sieve; a ZSM-5 molecular sieve is epitaxially grown on the inner surface of the mesoporousmolecular sieve through secondary crystallization; and then the through-type mesoporous ZSM-5 molecular sieve is generated. The method perfectly solves the problems, and method can be used in the industrial production of preparing various through mesoporous molecular sieves.

Description

technical field [0001] The invention relates to a straight-through mesoporous ZSM-5 molecular sieve and a preparation method thereof. Background technique [0002] ZSM-5 molecular sieve belongs to the series of microporous molecular sieves. It has a three-dimensional channel system, which is composed of sinusoidal channels and straight channels. The pore size is 0.54 nanometers. The molecular sieve has high hydrothermal stability, strong acidity and hydrophobicity. Because of its unique pore structure and high carbon deposition resistance, it plays an important role in the field of shape-selective catalysis. It is an important catalyst used in catalytic cracking of petroleum processing, MTP and so on. ZSM-5 molecular sieve was first developed by Mobil, using tetrapropyl ammonium hydroxide as a structure-directing agent and prepared by crystallization at 100-175°C for 6h-10 days. The active centers of microporous molecular sieves are mostly inside the pores. The longer ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/40
CPCC01B39/40C01P2002/01C01P2002/72C01P2006/12C01P2006/16
Inventor 唐康健袁晓红滕加伟
Owner CHINA PETROLEUM & CHEM CORP
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