Mordenite/Y zeolite coexisting molecular sieve and method for synthesizing same

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, weak acidity, single pore size of porous materials, etc. The effect of catalytic performance

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

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Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is that the porous

Method used

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  • Mordenite/Y zeolite coexisting molecular sieve and method for synthesizing same
  • Mordenite/Y zeolite coexisting molecular sieve and method for synthesizing same

Examples

Experimental program
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Embodiment 1

[0021] Get 569 grams of sodium metasilicate and dissolve in 900 grams of deionized water. In addition, 133 grams of aluminum sulfate was dissolved in 300 grams of deionized water, and added into the sodium silicate solution under stirring. Then continue to stir until uniform, and carry out conventional hydrothermal crystallization at 100° C. for 10 hours. The product was washed and dried at 130° C. for 4 hours to obtain the desired Y zeolite seed crystal of the present invention, which was denoted as M1.

Embodiment 2

[0023] According to the method and content provided in Example 1, the amount of aluminum sulfate added was changed to 267 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 33.4 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, 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=1:0.1:0.2:40, add 3.0 g 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 mordenite / Y zeolite intergrowth material, XRD diffraction pattern is as follows figure 1 As shown, there are d-spacing maxima at 14.52, 13.52, 8.96, 8.83, 6.71, 5.71, 4.51, 3.98, 3.78, 3.47, 2.86 Angstroms. Quantification by XRD diffraction shows that the weight percentage of mordenite in the intergrowth material is 54.5%, and the cont...

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Abstract

The invention relates to a mordenite/Y zeolite 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 mordenite/Y zeolite coexisting molecular sieve by adding a seed crystal containing a Y zeolite 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 mordenite/Y zeolite 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 14.52-0.05 and 14.52+0.05 A, 13.52-0.05 and 13.52+0.05 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, 5.71-0.1 and 5.71 +0.1 A, 4.51-0.1 and 4.51+0.1 A, 3.98-0.1 and 3.98+0.1 A, 3.78-0.05 and 3.78+0.05 A, 3.47-0.1 and 3.47+0.1 A, and 2.86-0.1 and 2.86+0.1 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 mordenite / Y zeolite symbiotic molecular sieve and a synthesis method thereof. Background technique [0002] Y zeolite 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 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...

Claims

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Application Information

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IPC IPC(8): C01B39/46C01B39/48C01B39/26C01B39/24
Inventor 马广伟谢在库张惠明
Owner CHINA PETROLEUM & CHEM CORP
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