Mordenite/beta zeolite/Y zeolite coexisting material and method for synthesizing same
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A technology of mordenite and synthesis method, applied in mordenite crystalline aluminosilicate zeolite, chemical instruments and methods, crystalline aluminosilicate zeolite, etc., can solve the problems of low activity, no involvement, weak acidity, etc., and achieve good catalysis The effect of performance, good technical effect
Active Publication Date: 2009-08-26
CHINA PETROLEUM & CHEM CORP +1
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[0007] The technical problem to be solved by the present invention is that one of the porous materials synthesized by the prior art has single pore size, weak acidity and low activity, and a new mordenite/beta zeolite/Y zeolite symbiotic material is provided, the porous material It has a multi-level pore structure, a w
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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 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 three Ethylamine and 29.4 grams of tetraethylammonium hydroxide (the mixed template is denoted as M), after stirring for a while, adjust the pH value at 11.5 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 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 for 3 hours, the mordenite / beta zeolite / Y zeolite intergrowth material was obtained, and the XRD diffraction pattern is as follows figure 1As shown, there are d-spacing maxima at 4.52, 13.52, 11.32, 8.9, 6.71, 5.71, 4.51, 4.15, 3.97, 3.78, 3.51, 3.02, 2.86 angstr...
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Abstract
The invention relates to a mordenite/beta zeolite/Y zeolite coexisting material 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/beta zeolite/Y zeolite coexisting material by adding a seed crystal containing a Y zeolite precursor during a synthesis process of mordenite/beta zeolite/Y zeolite coexisting material. A mole relation of the components of the synthesized mordenite/beta zeolite/Y zeolite coexisting material is nSiO2 :Al2O3, wherein n is between 4 and 400; the XRD diffraction pattern of the mordenite/beta zeolite/Y zeolite coexisting material comprises a technical proposal that a maximum value of a distance d is at positions between 14.52-0.1 and 14.52+0.1 A, 13.52-0.1 and 13.52+0.1 A,11.32-0.1 and 11.32+0.1 A, 8.96-0.1 and 8.96+0.1 A, 6.71-0.1 and 6.71+0.1 A, 5.71-0.1 and 5.71+0.1 A, 4.51-0.05 and 4.51+0.05 A, 4.15-0.05 and 4.15+0.05 A, 3.97-0.05 and 3.97+0.05 A, 3.78-0.05 and 3.78 +0.05 A, 3.51-0.05 and 3.51+0.05 A, 3.02-0.05 and 3.02+0.05 A, and 2.86-0.1 and 2.86+0.1 A; therefore, the problems are solved well. The mordenite/beta zeolite/Y zeolite coexisting material 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 / beta zeolite / Y zeolite symbiotic material and a synthesis method thereof. 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 mordenite / beta zeolite / Y zeolite symbiotic material containing more than two components has a multi-level pore structure and a wide distribution range of strong and weak acids. It can handle complex components with different molecular diameters and can exert their synergistic catalysis effect. [0003] Documents CN1565967A and CN1565970A report using ZSM-5 molecular sieve or mor...
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