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ZSM-5/mordenite/Yzeolite intergrowth molecular sieve and synthetic method thereof

A technology of symbiotic molecular sieve and mordenite, which is applied in mordenite crystalline aluminum silicate zeolite, molecular sieve and alkali exchange compounds, chemical instruments and methods, etc., can solve the problems of low activity, no involvement, weak acidity, etc., and achieve good catalytic performance , the effect of good technical effect

Active Publication Date: 2008-10-08
CHINA PETROLEUM & CHEM CORP +1
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  • 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. A new ZSM-5 / mordenite / Y zeolite symbiotic molecular sieve is provided. The porous material It has a multi-level pore structure, a wide range of strong and weak acids, and high activity; the second technical problem to be solved by the present invention is that the preparation method of the above-mentioned ZSM-5 / mordenite / Y zeolite symbiotic molecular sieve is not involved in the prior art Problem, provide a new preparation method of symbiotic molecular sieves

Method used

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  • ZSM-5/mordenite/Yzeolite intergrowth molecular sieve and synthetic method thereof
  • ZSM-5/mordenite/Yzeolite intergrowth molecular sieve and synthetic method thereof
  • ZSM-5/mordenite/Yzeolite intergrowth molecular sieve and synthetic method thereof

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Embodiment 1

[0023] Get 1137 grams of sodium metasilicate and dissolve in 1800 grams of deionized water. In addition, 178 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, 240 g of tetraethylammonium hydroxide 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 carried out at 160° 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 desired seed crystal of the present invention, which was designated as M1.

Embodiment 2

[0025] According to the method and content provided in Example 1, the addition of aluminum sulfate was changed to 267 grams to obtain the required seed crystals of the present invention, which were denoted as M2.

Embodiment 3

[0027] 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 12.2 grams of B Diamine and 29.4 grams of tetraethylammonium hydroxide (the mixed template 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 2O=1:0.05:0.4:40, add 2.8 grams of Y zeolite seed crystal M1, put the mixed solution in an autoclave, keep it at 160°C for 40 hours, then take it out and wash it twice, dry at 120°C for 4 hours, Roasting 3 hours, made ZSM-5 / mordenite / Y zeolite intergrowth material, XRD diffraction pattern is as follows figure 1 As shown, quantitatively by XRD diffraction, it can be seen that the mass percent content of ZSM-5 in the symbiotic material is 52.5%, the content of morde...

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Abstract

The invention relates to a ZSM-5 / mordenite / zeolite Y intergrowth molecular sieve and a synthetic method thereof, which mainly solves the problems of singular aperture, rather weak acidity and low activity of porous materials synthesized by the prior art. The invention adopts the technical proposal that the nucleation and process of growth of the molecular sieve are controlled properly by adding crystal seeds containing zeolite Y precursors in the synthetic process of the intergrowth molecular sieve for producing the ZSM-5 / mordenite / zeolite Y intergrowth molecular sieve, wherein the proportion of intergrowth phases is adjustable, and the synthesized ZSM-5 / mordenite / zeolite Y intergrowth molecular sieve adopts the compositions including the following mole relation: nSiO2:Al2O3, where n is between 4 and 400 in the formula, and the method is characterized in that the ZSM-5 / mordenite / zeolite Y intergrowth molecular sieve has more than two phases and an XRD diffraction pattern thereof has the d-space maximum value at the lengths of 14.3+-0.1, 13.58+-0.1, 11.21+-0.1, 10.04+-0.1, 9.47+-0.1, 9.09+-0.1, 6.6+-0.1, 5.7 +-0.1, 4.5+-0.1, 3.98+-0.05, 3.76+-0.04, 3.64+-0.04, 3.53+-0.04, 3.38+-0.02, 3.19+- 0.05 and 2.88+-0.1 angstroms, thereby solving the problems properly. The ZSM-5 / mordenite / zeolite Y intergrowth molecular sieve can be used for preparing ethylene and propylene by catalytic-cracking naphtha in the industrial production.

Description

technical field [0001] The invention relates to a ZSM-5 / mordenite / Y zeolite symbiotic molecular sieve and a synthesis method thereof. Background technique [0002] ZSM-5 molecular sieves and mordenite 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 ZSM-5 / mordenite / Y zeolite symbiotic molecular sieve containing more than two components has a multi-level pore structure and a wide distribution range of strong and weak acids, which can handle complex components with different molecular diameters and give full play to their synergy catalytic effect. [0003] Documents CN1565967A and CN1565970A report using ZSM-5 molecular s...

Claims

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Application Information

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IPC IPC(8): C01B39/46C01B39/04C01B39/38C01B39/26C01B39/24
Inventor 胡永君谢在库马广伟肖景娴
Owner CHINA PETROLEUM & CHEM CORP
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