Mordenite/beta zeolite/analcime porous coexisting material and method for synthesizing same
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A technology of mordenite and beta zeolite, which is applied in the field of mordenite/beta zeolite/analcite porous symbiotic materials and their preparation, can solve the problems of low activity, single pore size of porous materials, weak acidity, etc., and achieve good catalytic performance
Active Publication Date: 2009-08-26
CHINA PETROLEUM & CHEM CORP +1
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[0007] One of the technical problems to be solved by the present invention is that the porous
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Embodiment 1
[0021] 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 24.4 grams of B Diamine and 29.4 grams of tetraethylammonium hydroxide are used as the template agent M. After stirring for a period of time, the pH value is adjusted at 12 with sodium hydroxide and dilute sulfuric acid, and the molar ratio of the control sol is: Si: Al: M: H 2 O:OH - =1:0.05:0.4:40, put the mixed solution in an autoclave, keep it warm at 160°C for 40 hours, then take it out and wash it twice, dry at 120°C for 4 hours, and roast at 550°C for 3 hours to obtain Mordenite / β Zeolite / alalcite porous intergrowth material, XRD diffraction pattern as figure 1 As shown, there are d-spacing maxima at 13.52, 11.32, 9.47, 8.96, 7.07, 6.71, 4.51, 4.15, 3.98, 3.76, 3.65, 3.53, 3.47, 3.31, 3.02 Angstroms. Q...
Embodiment 2～6
[0023] According to the method of Example 1, the raw materials used are as shown in Table 4, and the pH of the solution is controlled to be different, and mordenite / beta zeolite / analcite symbiotic materials were synthesized respectively, as shown in Table 1. The XRD diffraction pattern is the same as that of Example 1, and the proportions of zeolite beta, mordenite and analcime in the intergrowth material are shown in Table 3.
[0024] Table 1
[0025] Example
Embodiment 7～17
[0027] According to the method of Example 1, the raw materials used are shown in Table 4, and the different molar ratios of the solutions are controlled, and the mordenite / beta zeolite / analcite symbiotic materials synthesized respectively are shown in Table 2. The XRD diffraction pattern is the same as that of Example 1, and the proportions of zeolite beta, mordenite and analcime in the intergrowth material are shown in Table 3.
[0028] Table 2
[0029] Example
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Abstract
The invention relates to a mordenite/beta zeolite/analcime porous 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 porous coexisting material by well controlling the nucleating and growing process of a molecular sieve during a synthesis process of porous material. The coexistence phase ratio of the porous coexisting material is adjustable, and a mole relation of the components of the synthesized porous coexisting material is nSiO2 :Al2O3, wherein n is between 4 and 400; the porous coexisting material has more than three phases; the XRD diffraction pattern of the porous coexisting material 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,11.32-0.1 and 11.32+0.1 A, 9.47-0.1 and 9.47+0.1 A, 8.96-0.1 and 8.96+0.1 A, 7.07-0.1 and 7.07+0.1 A, 6.71-0.1 and 6.71+0.1 A, 4.51-0.1 and 4.51+0.1 A, 4.15-0.1 and 4.15+0.1 A, 3.98-0.05 and 3.98+0.05 A, 3.76-0.05 and 3.76 +0.05 A, 3.65-0.05 and 3.65+0.05 A, 3.53-0.02 and 3.53+0.02 A, 3.47-0.02 and 3.47+0.02 A, 3.31-0.05 and 3.31+0.05 A, and 3.02-0.05 and3.02+0.05 A; therefore, the problems are solved well. The mordenite/beta zeolite/analcime porous 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 / alalcite porous symbiotic material and a preparation 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 porous symbiotic material 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 can exert their synergistic catalytic effect. [0003] Documents CN1565967A and CN1565970A report that ZSM-5 or mordenite is used as a seed crystal and added to the...
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