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Method for preparing Ti-MWW molecular sieve membrane by double-template method

A technology of molecular sieves and supports, applied in the direction of molecular sieve catalysts, catalyst activation/preparation, molecular sieves and base exchange compounds, etc., can solve the problems of affecting catalytic activity and increasing the electronegativity of the skeleton, and achieve simple operation and solve the difficulty of separation and recovery , Solve the effect of low reuse rate

Inactive Publication Date: 2019-05-31
JIANGXI NORMAL UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

CN 106083199A discloses a method for preparing Ti-MWW molecular sieve membrane. The method uses boric acid as a crystallization aid. It needs to be synthesized under the condition of a large amount of boron (Si / B=0.75), and the boron content in the skeleton is relatively high, resulting in The electronegativity of the skeleton increases, which affects the catalytic activity

Method used

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  • Method for preparing Ti-MWW molecular sieve membrane by double-template method
  • Method for preparing Ti-MWW molecular sieve membrane by double-template method
  • Method for preparing Ti-MWW molecular sieve membrane by double-template method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Follow the steps below to prepare Ti-MWW molecular sieve membranes:

[0028] (1) Add K to TMAdaOH aqueous solution 2 CO 3 , after stirring evenly, add HMI and tetrabutyl titanate, stir at room temperature for 30 minutes until clear, then add HS-40 and stir evenly, and age for 1 hour to obtain a molar ratio of 1SiO 2 :0.03TiO 2 :0.26TMAdaOH:0.3HMI:0.07K 2 O:60H 2 Synthetic gel of O;

[0029] (2) The pure phase flake Ti-MWW molecular sieve prepared by the method in the literature (J.PhyS.Chem.B, 105(2001) 289; J.Catal., 201(2001) 24) is used as a seed crystal and coated on 10cm On the outer surface of the tubular mullite support body, dry in an oven at 80°C for 3 hours;

[0030] (3) Then transfer the prepared synthetic gel and the support with pre-coated seed crystals to a titanium kettle, and the reactor was crystallized at 170°C for 6 days, and the crystallized samples were washed in boiling water. to neutral and dry at 80°C for 6 hours;

[0031] (4) Put the dri...

Embodiment 2

[0034] The molar proportioning in embodiment 1 is adjusted to 1SiO 2 :0.03TiO 2 :0.26TMAdaOH:0.3HMI:60H 2 O, do not join K 2 CO 3 , other synthesis conditions are consistent with Example 1. Since no film layer was formed without the addition of alkali metal, no catalytic performance was exhibited during the catalytic process.

Embodiment 3

[0036] The molar proportioning in embodiment 1 is adjusted to 1SiO 2 :0.03TiO 2 :0.56TMAdaOH:0.07K 2 O:60H 2 O, without adding HMI, other synthesis conditions are consistent with Example 1. Since the film growth is not dense, it does not exhibit catalytic performance during the catalytic process.

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Abstract

The invention discloses a method for preparing a Ti-MWW molecular sieve membrane by a double-template method.A pure-phaseTi-MWW molecular sieve is used as a seed crystal to be applied to the outer surface of a tubular supporting body, and the high-catalytic-activity Ti-MWW molecular sieve membrane is prepared on the porous tubular mullite supporting body through secondary hydrothermal growth. By adopting the hydrothermal growth method, the growth of the continuous and compactTi-MWW molecular sieve membrane on the porous mullite supporting body isprepared without adding of boric acid as crystallization aid, material preparation is executed by a one-pot method without an acid treatment process, and the process is simple.

Description

technical field [0001] The invention relates to a synthesis method of a Ti-MWW molecular sieve membrane, which belongs to the field of inorganic membrane materials. Background technique [0002] Molecular sieves with MWW structure have two sets of independent pores that do not cross each other. One is a ten-element two-dimensional sinusoidal channel with an inner diameter of 0.40×0.55nm; the other is a 12-element supercage with an interlayer diameter of 0.71×0.71×1.81nm; in addition, some twelve-element supercages with a depth of about 0.91nm are distributed on the surface. Yuan bowl-shaped hole. The tetravalent titanium atoms with high catalytic activity are introduced into the MWW molecular sieve framework, coupled with the unique supercage and layered structure, the Ti-MWW molecular sieve constructed has excellent performance in olefin epoxidation, phenol hydroxylation, ketoaminoxime It exhibits better catalytic performance than other titanium silicon molecular sieves i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J37/10C01B39/08C01B39/48C07C37/60C07C39/08
Inventor 朱美华陈祥树姜佳敏桂田刘永生
Owner JIANGXI NORMAL UNIV
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