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ZSM-5/beta zeolite/MCM-56 triphase coexisting molecular sieve and method for synthesizing same

A symbiotic molecular sieve, MCM-56 technology, applied in the direction of molecular sieves and alkali exchange compounds, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., can solve the problems of low activity, single pore size of porous materials, weak acidity, etc., to achieve The effect of good catalytic performance and good technical effect

Active Publication Date: 2009-08-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problems to be solved by the present invention are one of the problems that the porous materials synthesized in the prior art have single pore size, weak acidity and low activity, and a new ZSM-5 / beta zeolite / MCM-56 three-phase symbiotic molecular sieve is provided

Method used

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  • ZSM-5/beta zeolite/MCM-56 triphase coexisting molecular sieve and method for synthesizing same
  • ZSM-5/beta zeolite/MCM-56 triphase coexisting molecular sieve and method for synthesizing same

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Embodiment 1

[0021] Dissolve 1137 grams of sodium metasilicate in 1800 grams of deionized water. In addition, 89 grams of aluminum sulfate was dissolved in 350 grams of deionized water and added to the sodium silicate solution under stirring. After the solution is uniformly mixed, 158 g of hexamethyleneimine is added under stirring. After stirring, the pH value is adjusted to 11 with 30% sulfuric acid solution, then the stirring is continued until uniform, and the conventional hydrothermal crystallization is performed at 140°C for 15 hours. After washing, the product was dried at 130°C for 4 hours and calcined at 550°C for 3 hours to obtain the MCM-56 seed crystal required by the present invention, which was recorded as M1.

Embodiment 2

[0023] According to the method and content provided in Example 1, the added amount of aluminum sulfate was changed to 133.4 grams to prepare the MCM-56 seed crystal required by the present invention, which was recorded as M2.

Embodiment 3

[0025] Take 284 grams of sodium metasilicate and dissolve it into solution A with 300 grams of distilled water. Take 16.7 grams of aluminum sulfate and use 100 grams of distilled water to make solution B. Pour solution B into solution A slowly, stir vigorously, and then add 29.4 grams of four Ethyl ammonium hydroxide and 19.9 grams of hexamethylene imine (mixed template is marked as M), after stirring for a period of time, adjust the pH value at 11 with dilute sulfuric acid, and control the molar ratio of the sol: Si:Al:M : H 2 O=1:0.05:0.4:40, add 3.0 g of MCM-56 seed crystal M1, put the mixed solution into the autoclave, keep it at 140℃ for 40 hours, then take it out and wash it twice, dry at 120℃ for 4 hours, 550 It is calcined at ℃ for 3 hours to obtain ZSM-5 / β zeolite / MCM-56 symbiosis material. The XRD pattern is as follows figure 1As shown, there are maximum d-spacings at 12.26, 11.22, 9.97, 8.82, 7.74, 6.17, 5.14, 4.15, 3.90, 3.71, 3.45, 3.29, 2.98 angstroms. Quantitative X...

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Abstract

The invention relates to a ZSM-5 / beta zeolite / MCM-56 triphase coexisting molecular sieve and a method for synthesizing the same, and mainly solves the problems that a porous material synthesized by the prior art is single in pore-size, weak in acid and low in activity. The method prepares the triphase coexisting molecular sieve by adding a seed crystal containing an MCM-56 precursor during a synthesis process of diphase coexisting molecular sieve. A mole relation of the components of the synthesized triphase coexisting molecular sieve is nSiO2 :Al2O3, wherein n is between 10 and 1,000; the triphase coexisting molecular sieve has more than three phases; the XRD diffraction pattern of the triphase coexisting molecular sieve comprises a technical proposal that a maximum value of a distance d is at positions between 12.26-0.05 and 12.26+0.05 A, 11.22-0.2 and 11.22+0.2 A, 9.97-0.1 and 9.97+0.1 A, 8.82-0.1 and 8.82+0.1 A, 7.74-0.1 and 7.74+0.1 A, 6.17-0.1 and 6.17+0.1 A, 5.14-0.1 and 5.14+0.1 A, 4.15-0.1 and 4.15+0.1 A, 3.90-0.05 and 3.90+0.05 A, 3.71-0.1 and 3.71+0.1 A, 3.45-0.05 and 3.45+0.05 A, 3.29-0.1 and 3.29 +0.1 A, and 2.98-0.1 and 2.98+0.1A; therefore, the problems are solved well. The triphase coexisting molecular sieve can be used in the industrial production of ethylene and propylene through the catalytic pyrolysis of naphtha.

Description

Technical field [0001] The invention relates to a ZSM-5 / β zeolite / MCM-56 three-phase symbiosis molecular sieve and a synthesis method thereof. Background technique [0002] Beta zeolite and ZSM-5 porous materials have been widely used in petrochemical and other fields due to their good shape-selective catalytic performance and better thermal stability. However, due to the uniform and single pore size of the two molecular sieve materials, weak acidity, low activity and poor selectivity, they cannot handle complex components separately, and their catalytic performance for the same reactant is different. A three-phase symbiotic molecular sieve containing more than two components, with a multi-stage pore structure, a wide distribution of strong and weak acids, can handle complex components with different molecular diameters, and can exert their synergistic catalytic effect. [0003] Documents CN1565967A and CN1565970A reported that mordenite or ZSM-5 was used as seed crystals and add...

Claims

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Application Information

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IPC IPC(8): C01B39/46C01B39/48C01B39/38
Inventor 谢在库马广伟滕加伟
Owner CHINA PETROLEUM & CHEM CORP
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