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Method for synthesizing MCM-56 molecular sieves

A technology of MCM-56 and synthesis method, which is applied in the field of synthesis of MCM-56 molecular sieve, and can solve the problems of long crystallization time and low crystallinity of MCM-56 molecular sieve

Inactive Publication Date: 2005-06-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the crystallization time of the existing literature is relatively long in the process of synthesizing the MCM-56 molecular sieve, and the crystallinity of the synthesized MCM-56 molecular sieve is relatively low, and a kind of MCM-56 molecular sieve is provided. resolve resolution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Get 600 grams of 40% (weight) of silica sol, add 700 grams of water, 38.9 grams of sodium metaaluminate [Al 2 o 3 , 42% (weight)] and 2 grams of sodium hydroxide, after stirring, add 125 grams of hexamethyleneimine (HMI). The above mixture was aged at room temperature for 3 days, then raised to 138° C. for crystallization, and crystallized for 48 hours. Rinse with distilled water until neutral, and dry. X-ray powder diffraction showed (XRD) that the synthesized product was MCM-56. Wherein the above reaction mixture is in molar ratio: SiO 2 / Al 2 o 3 25,OH - / SiO 2 is 0.093, H 2 O / SiO 2 14.72, HMI / SiO 2 is 0.32. The obtained MCM-56 molecular sieve silicon aluminum molar ratio SiO 2 / Al 2 o 3 is 24.5, and the crystallinity of MCM-56 molecular sieve is 100%.

Embodiment 2～5

[0024] Example number

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Abstract

The invention relates to a method for synthesizing MCM-56 molecular sieves, which mainly solves the problems of long crystallization time during the synthesis of MCM-56 molecular sieves and low crystallinity of obtained MCM-56 molecular sieves in previous literatures. The invention preferably solves this problem by adopting the technical scheme of aging the synthesized MCM-56 molecular sieve precursor mixture at 0-100 DEG C for 0.5-720 hours, and can be used in the industrial preparation of MCM-56 molecular sieves.

Description

technical field [0001] The invention relates to a synthesis method of MCM-56 molecular sieve. Background technique [0002] In industry, zeolite molecular sieves are porous crystalline aluminosilicates, which have a regular and ordered crystal structure, so they have characteristic X-ray diffraction. The basic framework structure of molecular sieves is based on the rigid three-dimensional TO 4 (SiO 4 , AlO 4 etc.) unit structure; in this structure TO 4 Oxygen atoms are shared in a tetrahedral manner, and the skeleton tetrahedron such as AlO 4 The charge balance of is through surface cations such as Na + , H + existence is maintained. It can be seen that the framework properties of zeolite molecular sieves can be changed by means of cation exchange. At the same time, in the structure of zeolite molecular sieve, there are abundant pore systems with certain pore diameters, and these pore channels are interlaced to form a three-dimensional networ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/06C01B39/04
Inventor 高焕新周斌方华顾瑞芳季树芳
Owner CHINA PETROLEUM & CHEM CORP