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Coexisting molecular sieve and synthesis method thereof

A technology of symbiotic molecular sieves and synthesis methods, applied in the field of symbiotic molecular sieves and their synthesis, can solve the problems of low activity, weak acidity, single pore size of porous materials, etc., and achieve good catalytic performance

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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  • Coexisting molecular sieve and synthesis method thereof
  • Coexisting molecular sieve and synthesis method thereof
  • Coexisting molecular sieve and synthesis method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] 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 carried out 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 MCM-22 seed crystal required by the present invention, which was designated as C1.

Embodiment 2

[0024] 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 MCM-22 seed crystal required by the present invention, which was denoted as C2.

Embodiment 3

[0026]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 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 1 :H 2 O=1:0.05:0.4:40, add 3.0 g of MCM-22 seed crystal C1, 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 obtain mordenite / MCM-22 intergrowth material FH-3, the XRD diffraction pattern is as follows figure 1 As shown, there are d-spacing maxima at 13.52, 12.35, 11.08, 8.96, 8.83, 6.71, 6.17, 4.51, 4.05, 3.45, 3.29, 3.20 angstroms. Quantification by XRD d...

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Abstract

The invention relates to a coexisting molecular sieve and a synthesis method thereof, 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 coexisting molecular sieve by adding a seed crystal containing a laminated structure precursor and well controlling the nucleating and growing process of a molecular sieve during a synthesis process of mordenite. The coexistence phase ratio of the coexisting molecular sieve is adjustable, and a mole relation of the components of the synthesized coexisting molecular sieve is nSiO2 :Al2O3, wherein n is between 4 and 400; the coexisting molecular sieve has more than two phases, the XRD diffraction pattern of the coexisting molecular sieve comprises a technical proposal that a maximum value of a distance d is at positions between 13.52-0.1 and 13.52+0.1 A, 12.35-0.1 and 12.35+0.1 A, 11.08-0.1 and 11.08+0.1 A, 8.96-0.05 and 8.96+0.05 A, 8.83-0.05 and 8.83+0.05 A, 6.71-0.1 and 6.71+0.1 A, 6.71-0.1and6.71+0.1 A,4.51-0.1 and 4.51+0.1 A, and 3.29-0.02 and 3.29+0.02 A; therefore, the problems are solved well. The 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 symbiotic molecular sieve and a synthesis method thereof. Background technique [0002] MCM-22 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 symbiotic molecular sieve containing more than two components has a multi-level pore structure and a wide range of strong and weak acids, which can handle complex components with different molecular diameters and exert their synergistic catalytic effect. [0003] Documents CN1565967A and CN1565970A report using ZSM-5 molecular sieve or mordenite as seed crystals and adding them to the synthesis solution of mord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/46C01B39/26
Inventor 谢在库马广伟宗弘元
Owner CHINA PETROLEUM & CHEM CORP
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