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Mordenite/beta zeolite/MCM-22 triphase coexisting molecular sieve and method for synthesizing same

A symbiotic molecular sieve, MCM-22 technology, applied in the direction of mercerized crystalline aluminum silicate zeolite, molecular sieve and alkali exchange compounds, chemical instruments and methods, 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] One of the technical problems to be solved by the present invention is that the porous material synthesized by the prior art has a single pore size, weak acidity and low activity.

Method used

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  • Mordenite/beta zeolite/MCM-22 triphase coexisting molecular sieve and method for synthesizing same
  • Mordenite/beta zeolite/MCM-22 triphase coexisting molecular sieve and method for synthesizing same

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Embodiment 1

[0021] Get 1137 grams of sodium metasilicate and dissolve in 1800 grams of deionized water. In addition, 89 grams of aluminum sulfate was dissolved in 350 grams of deionized water, and added into the sodium silicate solution under stirring. After the solution was mixed evenly, 158 g of hexamethyleneimine was added under stirring. After stirring evenly, the pH value was adjusted to 11 with 30% sulfuric acid solution, and then the stirring was continued until uniform. Conventional hydrothermal crystallization was performed at 150° C. for 10 hours. After washing, the product was dried at 130°C for 4 hours and calcined at 550°C for 3 hours to obtain the desired seed crystal of the present invention, which was designated 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 obtain the required seed crystal of the present invention, which was denoted as M2.

Embodiment 3

[0025] Take 284 grams of sodium metasilicate, dissolve it into solution A with 300 grams of distilled water, take 16.7 grams of aluminum sulfate, and make solution B with 100 grams of distilled water, slowly pour B solution into A solution, stir vigorously, and then add 29.4 grams of four Ethyl ammonium hydroxide and 19.9 grams of hexamethyleneimine (the mixed template agent is denoted 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-22 seed crystal M1, put the mixed solution in an autoclave, keep it at 150°C for 40 hours, then take it out and wash it twice, dry at 120°C for 4 hours, 550 ℃ roasting for 3 hours to prepare β zeolite / mordenite / MCM-22 intergrowth material, the XRD diffraction pattern is as follows figure 1As shown, there are d-spacing maxima at 13.58, 12.35, 11.32, 11.08, 8.83, 8.96, 6.71, 6.17, 4.51, 4.15, 3.90, 3.42, 3.29, 3.1...

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Abstract

The invention relates to a mordenite / beta zeolite / MCM-22 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 porous coexisting material by adding a seed crystal containing an MCM-22 precursor and well controlling the nucleating and growing process of a molecular sieve during a synthesis process of triphase coexisting molecular sieve. The coexistence phase ratio of the triphase coexisting molecular sieve is adjustable, and a mole relation of the components of the synthesized triphase coexisting molecular sieve is nSiO2 :Al2O3, wherein n is between 4 and 400; 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 13.58-0.1 and 13.58+0.1 A, 12.35-0.1 and 12.35+0.1 A, 11.32-0.1 and 11.32+0.1 A, 11.08-0.1 and 11.08+0.1 A, 8.83-0.05 and 8.83+0.05 A, 8.96-0.05 and 8.96+0.05 A, 6.71-0.1 and 6.71+0.1 A, 6.17-0.1 and 6.17+0.1 A, 4.51-0.1 and 4.51+0.1 A, 4.15-0.05 and 4.15+0.05 A, 3.90-0.05 and 3.90+0.05 A, 3.42-0.05 and 3.42+0.05 A, 3.29-0.04 and 3.29+0.04 A, 3.19-0.04 and 3.19+0.04 A, and 3.02-0.1 and 3.02+0.1 A; 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 three-phase symbiotic molecular sieve and a synthesis method thereof. Especially about mordenite / beta zeolite / MCM-22 three-phase intergrowth molecular sieve and its synthesis method. Background technique [0002] Beta zeolite and mordenite (MOR) porous materials are widely used in petrochemical and other fields due to their good shape-selective catalytic performance and good thermal stability. However, because the two molecular sieve materials have uniform and single pore size, weak acidity, low activity and poor selectivity, they cannot process complex components separately, and their catalytic properties for the same reactant are different. The three-phase symbiotic molecular sieve containing more than two components has a multi-level pore structure and a wide range of strong and weak acids. It can handle complex components with different molecular diameters and exert their synergistic catalytic effect. [0003] Documents...

Claims

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Application Information

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IPC IPC(8): C01B39/46C01B39/48C01B39/26
Inventor 马广伟张惠明
Owner CHINA PETROLEUM & CHEM CORP
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