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Magadiite-beta zeolite coexisting material and method for synthesizing same

A synthesis method and technology of zeolite beta, applied in biological raw materials, chemical instruments and methods, ethylene production, etc., can solve the problems that the pore diameter cannot be adjusted at will, and the pore diameter of porous materials is single, so as to achieve good catalytic performance, increase the specific surface area, The effect of increasing selectivity

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

[0008] One of the technical problems to be solved by the present invention is that the porous material synthesized in the prior art has a single pore diameter and the pore diameter cannot be adjusted arbitrarily.

Method used

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  • Magadiite-beta zeolite coexisting material and method for synthesizing same

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Experimental program
Comparison scheme
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Embodiment 1

[0023]Get 569 grams of sodium metasilicate and dissolve in 900 grams of deionized water. In addition, 33.4 grams of aluminum sulfate was dissolved in 150 grams of deionized water, and added into the sodium silicate solution under stirring. After the solution was mixed evenly, 59 g of tetraethylammonium hydroxide 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 desired seed crystal of the present invention, which was designated as M1.

Embodiment 2

[0025] According to the method and content provided in Example 1, the added amount of aluminum sulfate was changed to 17.7 grams to obtain the required seed crystal of the present invention, which was denoted as M2.

Embodiment 3

[0027] Get 33.3 grams of sodium metasilicate, dissolve into solution A with 100 grams of distilled water, get 57.4 grams of 40% silica sol, make solution β with 100 grams of distilled water, get 0.48 grams of aluminum sulfate, make solution C with 20 milliliters of distilled water, Slowly pour the A and C solutions into the β solution, stir vigorously, add 2.6 grams of sodium hydroxide and 29.4 grams of tetraethylammonium hydroxide, and then add 1.2 grams of β zeolite seed crystal M1, stir for a period of time, use dilute Sulfuric acid adjusts the pH value at 11, and the molar ratio of the control sol is: Si: Al: Na: M: H 2 O=1:0.005:0.6:0.4:40, put the mixed solution into 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 bake at 550°C for 3 hours to obtain Magadiite / β zeolite intergrowth material, the XRD diffraction pattern is as follows figure 1 As shown, there are d-spacing maxima at 15.73, 11.32, 11.14, 9...

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Abstract

The invention relates to a magadiite-beta 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 and nonadjustable in pore-size distribution. The method prepares a magadiite-beta zeolite coexisting material by well controlling the nucleating and growing process of a molecular sieve during a synthesis process of beta zeolite molecular sieve material. The coexistence phase ratio of the magadiite-beta zeolite coexisting material is adjustable, and a mole relation of the components of the synthesized magadiite-beta zeolite coexisting material is nSiO2 :Al2O3, wherein n is between 20 and 2,000; the magadiite-beta zeolite coexisting material has two coexistence phases, the XRD diffraction pattern of the magadiite-beta zeolite coexisting material comprises a technical proposal that a maximum value of a distance d is at positions between 15.73-0.1 and 15.73+0.1 A, 11.14-0.1 and 11.14+0.1 A, 9.97-0.1 and 9.97+0.1 A, 7.74-0.1 and 7.74+0.1 A, 5.14-0.1 and 5.14+0.1 A, 3.86-0.05 and 3.86+0.05 A, 3.66-0.05 and 3.66+0.05 A, 3.45-0.05 and 3.45+0.05 A, 3.30-0.05 and 3.30+0.05 A, and 3.14-0.1 and 3.14+0.1 A; therefore, the problems are solved well. The magadiite-beta zeolite coexisting material can be used in the industrial production of ethylene and propylene through the dehydration of methanol.

Description

technical field [0001] The invention relates to a Magadiite / beta zeolite symbiotic material and a synthesis method thereof. Background technique [0002] Beta zeolite porous materials are widely used in petrochemical and other fields due to their good shape-selective catalytic performance and good thermal stability. However, due to the uniform and single pore diameter of the zeolite beta material, the pore diameter is not easy to adjust at will, and complex components cannot be processed. Magadiite is a two-dimensional layered structure material. Its laminates are composed of negatively charged Si-0 tetrahedra, so it has good thermal stability. Magadiite has some typical properties of charged layered structure materials, such as water As well as the adsorption of some small polar organic molecules, there are hydrated sodium ions that can be exchanged between the layers, and the layers have good expansibility, which can accommodate molecules or groups ranging from protons to...

Claims

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Application Information

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IPC IPC(8): C01B39/46C01B39/48
CPCY02P30/20Y02P30/40
Inventor 马广伟谢在库滕加伟肖景娴
Owner CHINA PETROLEUM & CHEM CORP
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