Process for synthesizing MCM-56 molecular sieve

A technology of MCM-56 and synthesis method, which is applied in the field of synthesis of MCM-56 molecular sieve, can solve the problems such as difficult control of MCM-56 molecular sieve crystal phase and easy occurrence of crystal transformation, so as to solve the problem that crystal phase is difficult to control, the process is simple and easy The effect of industrial production

Inactive Publication Date: 2009-10-07
EAST CHINA NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The biggest shortcoming of this method is that the crystal phase of the synthesized product MCM-56 molecular sieve is difficult to control, and it is easy to undergo crystal transformation and transform into MCM-49 molecular sieve, another member of the MWW structure molecular sieve family.

Method used

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  • Process for synthesizing MCM-56 molecular sieve

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Experimental program
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Embodiment 1

[0020] The raw material MCM-22(p) was synthesized according to the method described in US 4,954,325.

[0021] The first step acid treatment MCM-22(p)

[0022] MCM-22(p) and a nitric acid solution with a concentration of 2 mol / l were prepared in a weight ratio of 1:50 to prepare a reaction mixture, treated at room temperature for 20 hours, filtered, washed, and dried to obtain an acid-treated product;

[0023] Second step roasting

[0024] The acid-treated product obtained in the first step was calcined at 550°C for 8 hours to obtain the product MCM-56 molecular sieve.

[0025] The XRD spectrum of the product MCM-56 molecular sieve is as follows figure 1 shown.

Embodiment 2～6

[0027] Implementation process is except following difference, and all the other are all the same with embodiment 1:

[0028] The first step acid treatment MCM-22(p)

[0029] Reaction mixture weight ratio and processing conditions:

Embodiment 2

[0030] Embodiment 2MCM-22 (p): 6mol / l nitric acid=1: 20, treated at room temperature for 36 hours;

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Abstract

The invention discloses a method for synthesizing MCM-56 molecular sieves, belonging to the technical field of inorganic chemical synthesis. The molecular sieve is a member of the molecular sieve family with MWW structure, and US5,362,697 first disclosed its synthesis method: controlling the generation of MCM-56 molecular sieve by controlling the crystallization conditions. The disadvantage of this method is that the crystal phase of the synthetic product MCM-56 molecular sieve is difficult to control, and crystal transformation is prone to occur. The technical scheme of the present invention is characterized in that the MCM-22(p) is used as raw material, the MCM-22(p) is acid-treated and calcined to obtain the MCM-56 molecular sieve. The invention has the advantages of stable crystal phase of synthetic product MCM-56 molecular sieve, simple process, no special equipment requirements and easy realization of industrialized production, and is especially suitable for preparing MCM-56 molecular sieve.

Description

technical field [0001] The invention relates to a synthesis method of MCM-56 molecular sieve, which belongs to the technical field of inorganic chemical synthesis. Background technique [0002] MCM-56 molecular sieve is a member of the molecular sieve family with MWW structure. Such molecular sieves were first disclosed by Fung et al. in US 5,362,697. Because MCM-56 molecular sieve has a large specific surface area and many surface holes, it shows high catalytic activity in the catalytic reaction of macromolecules. [0003] The current synthesis method of MCM-56 molecular sieve is basically based on the process disclosed in US5,362,697. That is, the generation of MCM-56 molecular sieve is controlled by controlling the crystallization conditions. The biggest disadvantage of this method is that the crystal phase of the synthesized product MCM-56 molecular sieve is difficult to control, and it is easy to undergo crystal transformation and transform into another member of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02
Inventor 刘月明吴鹏汪玲玲王勇何鸣元
Owner EAST CHINA NORMAL UNIV
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