ZSM-11/SAPO-34 composite molecular sieve, and synthetic method thereof

A SAPO-34, ZSM-11 technology, applied in the field of ZSM-11/SAPO-34 composite molecular sieve and its synthesis, can solve the problems of low reactivity, weak acidity, and single pore size of porous materials, and achieve high reactivity and acidity. widely distributed effect

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, 9g silica sol (40%), 18g orthophosphoric acid (85%), 20g triethylamine and 90g water, mix under stirring condition;

[0029] (2) Take by weighing 20g H type ZSM-11 molecular sieve, add in the mixed solution that step (1) obtains, stir;

[0030] (3) Transfer the mixed solution obtained in step (2) to a closed high-pressure crystallization kettle, and crystallize at 185° C. for 60 h;

[0031] (4) The product is taken out, washed with water, dried and roasted to obtain ZSM-11 / SAPO-34 composite molecular sieve, quantified by XRD diffraction, the weight content of SAPO-34 molecular sieve in the product is 45%, the weight content of ZSM-11 molecular sieve 55%.

Embodiment 2

[0033] (1) Take by weighing 16g pseudoboehmite, 12.5g silica sol (40%), 22g orthophosphoric acid (85%), 30g tetraethylammonium hydroxide and 100g water, mix under stirring condition;

[0034] (2) Take by weighing 10g Na type ZSM-11 molecular sieve, add in the mixed solution that step (1) obtains, stir;

[0035] (3) Transfer the mixed solution obtained in step (2) to a closed high-pressure crystallization kettle, and crystallize at 170° C. for 50 h;

[0036] (4) The product is taken out, washed with water, dried and roasted to obtain ZSM-11 / SAPO-34 composite molecular sieve, quantified by XRD diffraction, the weight content of SAPO-34 molecular sieve in the product is 70%, the weight content of ZSM-11 molecular sieve 30%.

Embodiment 3

[0038] (1) Take by weighing 38g aluminum isopropoxide, 22g silica sol (40%), 5g aluminum dihydrogen phosphate, 25g orthophosphoric acid (85%), 30g morpholine, 15g tetraethylammonium hydroxide and 150g water stirring condition mix;

[0039] (2) take by weighing the ZSM-11 molecular sieve of 50g Zn ion exchange, add in the mixed solution that step (1) obtains, stir;

[0040] (3) Transfer the mixed solution obtained in step (2) to a closed high-pressure crystallization kettle, and crystallize at 200° C. for 56 hours;

[0041] (4) The product is taken out, washed with water, dried and roasted to obtain ZSM-11 / SAPO-34 composite molecular sieve, quantified by XRD diffraction, the weight content of SAPO-34 molecular sieve in the product is 30%, the weight content of ZSM-11 molecular sieve 70%.

[0042] Press and crush the composite molecular sieve, take 9g of a sample of 10-20 mesh and place it in a fixed bed reactor, and make it react with methanol under the condition of 460°C, an...

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Abstract

The invention discloses a ZSM-11 / SAPO-34 composite molecular sieve and a synthetic method thereof to overcome the problems of a single pore diameter, weak acidity and low reaction activity of a porous material synthesized in the prior art. The synthetic method comprises the following steps: mixing a silicon source, an aluminum source, a phosphorus source and an organic template according to a certain ration; then adding a certain amount of a ZSM-11 molecular sieve; carrying out uniform mixing; and then carrying out hydrothermal crystallization and synthesizing the ZSM-11 / SAPO-34 composite molecular sieve by controlling nucleation and crystal growth conditions, wherein the silica-alumina ratio and a ratio of two phases of the composite molecular sieve are adjustable. Thus, the above problems are overcome. The ZSM-11 / SAPO-34 composite molecular sieve is applicable to industrial production of aromatic hydrocarbons through a reaction of methanol with dimethyl ether.

Description

technical field [0001] The invention relates to a ZSM-11 / SAPO-34 composite molecular sieve and a synthesis method thereof. Background technique [0002] Molecular sieves are a class of substances with uniform micropores, and the pore size is equivalent to the size of ordinary molecules. Due to its regular structure, adjustable surface acidity and molecular pore size, molecular sieve materials are widely used as catalysts, gas adsorbents and separation agents, ion exchangers and high-efficiency desiccants in oil and gas processing, fine chemicals , environmental protection and other fields. Among them, ZSM-11 molecular sieve is a member of high-silicon ZSM series molecular sieves. It is a tetragonal crystal system and belongs to Pentasil type zeolite. Due to the unique lattice structure of ZSM-11 molecular sieve, the silicon-alumina ratio in the crystal structure is relatively high, and the surface of the crystal has obvious hydrophobic effect and strong surface acidity. It...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85C07C1/20C07C15/02
CPCY02P20/52
Inventor 陈希强马广伟
Owner CHINA PETROLEUM & CHEM CORP
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