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Method for preparing layered zeolite with MWW structure

A layered zeolite and mixture technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of potential safety hazards, template agent storage, transportation, high cost of use and management, etc., to reduce dosage, shorten crystallization time, and improve production speed effect

Inactive Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that a large amount of highly toxic hexamethyleneimine is used as a template in the process of preparing layered zeolite with a MWW structure in the prior art, which brings great safety to the production process of the enterprise. Hidden dangers, as well as the storage, transportation, use process and related management costs of template agents are high, providing a new method for preparing layered zeolites with MWW structure

Method used

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  • Method for preparing layered zeolite with MWW structure
  • Method for preparing layered zeolite with MWW structure
  • Method for preparing layered zeolite with MWW structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The synthetic process of the present invention is as follows: take by weighing 150 grams (1 mole) of silica sol (40% by weight), 30 grams (0.05) of aluminum sec-butoxide, 75 grams of dimethyl diethyl ammonium hydroxide (20% by weight) aqueous solution ( 0.1 mole), 11.6 grams (0.2 moles) of sodium chloride, 4 grams (0.1 moles) of sodium hydroxide, 8 grams of seed crystals, and 50 grams of distilled water were mixed and stirred for 18 hours, and the slurry mixture was poured into the crystallization kettle , moved into an oven for crystallization at 140°C for 4 days, took out the product, filtered, washed, and the XRD powder diffraction spectrum detection of the dried product determined that the zeolite microcrystal was a zeolite with a layered WMM structure. The specific X-ray diffraction spectrum is shown in the attached figure 1 , and its XRD spectrum has a dissociation peak at 7°-11°, indicating that the product prepared by the present invention is a layered zeolite wi...

Embodiment 2～9

[0034] The synthesis steps and methods of [Examples 2-9] are the same as [Example 1], except that the types and proportions of raw materials, crystallization temperature, crystallization time, templating agent, seed crystals and proportions are changed. The synthesized zeolite product was determined by XRD powder diffraction spectrum detection. The zeolite microcrystal is a layered zeolite with a similar MWW topology. The specific X-ray diffraction spectrum and the attached figure 1 unanimous. The specific data are the same as in Table 1. Template agent: The molecular formula of the template agent obtained according to the different values ​​of m, n, k, and l in the general formula of the template agent is represented by different English letters, as shown in Table 2. The ratio of raw materials for the synthesis system is shown in Table 3.

[0035] In this method, during the preparation of layered zeolite molecular sieves, unequal tetraalkylammonium cations are used to repla...

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Abstract

The invention relates to a method for preparing a layered zeolite with MWW structure and aims to solve problems of severe toxicity and environmental pollution of a prior art using hexamethylene imines as a template. According to the invention, silicon source, aluminium source, template (T), alkali metal cation M, seed crystal and water are mixed into a mixture, wherein molar ratios of the mixture are as below: SiO2 / Al2O3 equals to 1-200; H2O / SiO2 equals to 5-500; OH<-> / SiO2 equals to 0.01-4; M<+> / SiO2 equals to 0.01-4; and T / SiO2 equals to 0.01-4; the mixture is crystallized for 1-400 h at 30-200 DEG C to obtain a crystallization product, which is the layered zeolite with MWW structure; and the template T is non-equivalence tetra-allkylammonium cation. The above technical scheme well solves the problems and can be applied to industrial production of layered zeolite with MWW structure.

Description

technical field [0001] The present invention relates to a method for preparing layered zeolite with MWW structure, which is also called MCM-56 zeolite. Background technique [0002] Zeolite molecular sieves are a class of SiO 2 and AlO 2 A crystalline aluminosilicate with molecular pores or cages formed at the vertices of tetrahedrons (or other corresponding elements that can form tetrahedrons) (or crystals containing other elements that can form tetrahedrons). Widely used in the fields of petroleum refining, petrochemistry, synthesis of fine and special chemicals, etc., it has the functions of ion exchange, shape-selective catalysis, molecular sieving and so on. [0003] The three-dimensional structure of zeolite-based catalytic materials has strong acidic active sites and shape-selective effects, and its pore diameter is generally less than 1 nanometer, which cannot accommodate larger reactant molecules. Compared with three-dimensional structured zeolite catalytic mater...

Claims

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Application Information

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IPC IPC(8): C01B39/04
Inventor 钱斌郑钧林陈燕李旭光
Owner CHINA PETROLEUM & CHEM CORP
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