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ZSM-23/SAPO-34 composite molecular sieve and synthesis method of same

A technology of SAPO-34 and ZSM-23, which is applied in the field of composite molecular sieves and their synthesis, can solve the problems of low reactivity, weak acidity, single pore size of porous materials, etc., and achieve the effect of high reactivity and wide distribution of acidity

Inactive Publication Date: 2017-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the technical problems to be solved by the present invention is that the porous materials synthesized in the prior art have single pore size, weak acidity and low reactivity. A composite molecular sieve is provided. The molecular sieve has multi-stage channels, wide acid distribution and low reactivity. higher advantage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) take by weighing 15g pseudo-boehmite, 8g silica sol (40%), 19g orthophosphoric acid (85%), 15g triethylamine, 10g tetraethylammonium hydroxide and 80g water, mix well under stirring conditions;

[0029] (2) Weigh 15g H-type ZSM-23 molecular sieve, add it to the mixed solution obtained in step (1), and stir evenly;

[0030] (3) transfer the mixed solution obtained in step (2) into a closed high-pressure crystallization kettle, and crystallize at 180° C. for 48 hours;

[0031] (4) product is taken out, through washing, drying, roasting, obtain ZSM-23 / SAPO-34 composite molecular sieve, quantify by XRD diffraction, the weight content of SAPO-34 molecular sieve in the product is 62%, the weight content of ZSM-23 molecular sieve was 38%.

Embodiment 2

[0033] (1) take by weighing 16g pseudo-boehmite, 12g silica sol (40%), 23g orthophosphoric acid (85%), 28g tetraethylammonium hydroxide and 100g water, mix under stirring conditions;

[0034] (2) take by weighing 8g Na type ZSM-23 molecular sieves, add to the mixed solution obtained in step (1), stir evenly;

[0035] (3) transfer the mixed solution obtained in step (2) into a closed high-pressure crystallization kettle, and crystallize at 165 ° C for 62 h;

[0036] (4) product is taken out, through washing, drying, roasting, obtain ZSM-23 / SAPO-34 composite molecular sieve, quantify by XRD diffraction, the weight content of SAPO-34 molecular sieve in the product is 75%, the weight content of ZSM-23 molecular sieve to 25%.

Embodiment 3

[0038] (1) take by weighing 40g aluminum isopropoxide, 22g silica sol (40%), 28g orthophosphoric acid (85%), 40g morpholine, 10g tetraethylammonium hydroxide and mix under stirring conditions of 120g water;

[0039] (2) take by weighing the ZSM-23 molecular sieve of 60g Zn ion exchange, add in the mixed solution that step (1) obtains, stir;

[0040] (3) transfer the mixed solution obtained in step (2) into a closed high-pressure crystallization kettle, and crystallize at 200° C. for 64 hours;

[0041] (4) product is taken out, through washing, drying, roasting, obtain ZSM-23 / SAPO-34 composite molecular sieve, quantify by XRD diffraction, the weight content of SAPO-34 molecular sieve in the product is 25%, the weight content of ZSM-23 molecular sieve is 75%.

[0042] The composite molecular sieve was tableted and crushed, and 9 g of a 10-20 mesh sample was placed in a fixed-bed reactor, and it was contacted and reacted with methanol at 450 °C. The mass space velocity of methan...

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Abstract

The invention relates to a ZSM-23 / SAPO-34 composite molecular sieve and a synthesis method of same and solves the problems that a porous material in the prior art is single in pore size, has weak acidity and is low in reaction activity. The method includes the steps of: mixing a silicon source, an aluminum source, a phosphorus source and an organic template agent in certain ratio, adding a certain quantity of ZSM-23 molecular sieve, and uniformly mixing the components and performing hydrothermal crystallization so as to synthesize the ZSM-23 / SAPO-34 composite molecular sieve by controlling nucleation and crystal growth conditions, wherein the Si / Al ratio and two-phase ratio of the composite molecular sieve are adjustable, so that the problems hereinabove are solved well. The composite molecular sieve can be used in industrial production of a methanol / dimethyl ether reaction to produce aromatic hydrocarbons.

Description

technical field [0001] The invention relates to a composite molecular sieve and a synthesis method thereof. Background technique [0002] Molecular sieves are a class of substances with uniform pores and the pore size is comparable to the general molecular size. Due to its regular structure, adjustable surface acidity and pore size of molecular size, molecular sieve materials are widely used as catalysts, gas adsorbents and separators, ion exchangers and high-efficiency desiccants in oil and gas processing, fine chemicals , environmental protection and other fields. Among them, ZSM-23 molecular sieve is a kind of microporous high silicon molecular sieve, which was first successfully synthesized by C.J.Plank et al. in the 1970s. ZSM-23 molecular sieve has a topological framework of MTT structure, which contains five-membered ring, six-membered ring and ten-membered ring at the same time, but there is no cross-channel similar to MFI structure. Cross-linked, the pore shape i...

Claims

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Application Information

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IPC IPC(8): B01J29/85C07C1/20C07C15/02
CPCY02P20/52
Inventor 陈希强汪哲明
Owner CHINA PETROLEUM & CHEM CORP