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Zsm-5/zsm-23/y zeolite three-phase intergrowth molecular sieve and its synthesis method

A technology of ZSM-23 and ZSM-5, which is applied in the field of ZSM-5/ZSM-23/Y zeolite three-phase symbiotic molecular sieve and its synthesis, can solve the problems of low activity, single pore size of porous materials, weak acidity, etc., and achieve The effect of good catalytic performance and good technical effect

Active Publication Date: 2011-11-30
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, and a new ZSM-5 / ZSM-23 / Y zeolite three-phase symbiotic molecular sieve is provided

Method used

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  • Zsm-5/zsm-23/y zeolite three-phase intergrowth molecular sieve and its synthesis method
  • Zsm-5/zsm-23/y zeolite three-phase intergrowth molecular sieve and its synthesis method

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Embodiment 1

[0021] Get 1137 grams of sodium metasilicate and dissolve in 1800 grams of deionized water. In addition, 267 grams of aluminum sulfate was dissolved in 350 grams of deionized water, and added into the sodium silicate solution under stirring. After stirring evenly, adjust the pH value to 11 with 30% sulfuric acid solution, then continue to stir until uniform, and carry out conventional hydrothermal crystallization at 120° 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 Y zeolite seed crystal required by the present invention, which was designated as M1.

Embodiment 2

[0023] According to the method and content provided in Example 1, the amount of aluminum sulfate added was changed to 133.4 grams to obtain the Y zeolite seed crystal required by 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 12.2 grams of B Diamine and 14.2 grams of pyrrolidine (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 Y zeolite 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, Roasting for 3 hours, the ZSM-5 / ZSM-23 / Y zeolite intergrowth material was obtained, and the XRD diffraction pattern is as follows figure 1As shown, there are d-spacing maxima at 14.52, 11.22, 10.1, 9.97, 7.87, 5.98, 5.71, 5.59, 4.53, 3.90, 3.71, 3.54, 3.43, 2.99, 2.86, 2.53 Angstroms. ...

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Abstract

The invention relates to a ZSM-5 / ZSM-23 / Y zeolite three-phase symbiotic molecular sieve and a synthesis method thereof, which mainly solves the problems of single pore size, weak acidity and low activity of the porous material synthesized in the prior art. The present invention prepares a ZSM-5 / ZSM-23 / Y zeolite three-phase by adding seed crystals containing Y zeolite precursors during the synthesis process of the three-phase symbiotic molecular sieve to control the nucleation and growth process of the molecular sieve. The symbiotic molecular sieve, wherein the proportion of the symbiotic phase is adjustable, and the synthesized three-phase symbiotic molecular sieve adopts the composition with the following molar relationship: nSiO2:Al2O3, where n=10~1000, wherein the three-phase symbiotic molecular sieve has more than three kinds of substances phase, its XRD diffraction patterns include 14.52±0.1, 11.22±0.1, 10.1±0.05, 9.97±0.05, 7.87±0.2, 5.98±0.1, 5.71±0.1, 5.59±0.1, 4.53±0.1, 3.90±0.1, 3.71±0.1 0.05, 3.54±0.05, 3.43±0.05, 2.99±0.05, 2.86±0.05, 2.53±0.1 Angstroms have the technical solution of the maximum d-spacing, which better solves the above problems. The three-phase symbiotic molecular sieve can be used in the industrial production of ethylene propylene by catalytic cracking of naphtha.

Description

technical field [0001] The invention relates to a ZSM-5 / ZSM-23 / Y zeolite three-phase symbiotic molecular sieve and a synthesis method thereof. Background technique [0002] ZSM-23, Y zeolite and ZSM-5 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 CN1565967A and CN1565970A report using mordenite or ZSM-5 as a seed crystal, respectively addin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/46C01B39/48C01B39/38C01B39/24
Inventor 马广伟谢在库滕加伟张慧宁
Owner CHINA PETROLEUM & CHEM CORP