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A preparation method of coated pure silicon mesoporous MSU-1 molecular sieve membrane core-shell catalyst

A MSU-1, molecular sieve technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc.

Inactive Publication Date: 2011-11-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the methods reported in the literature, there is no method of covering the surface of a spherical carrier with a pure silicon mesoporous MSU-1 molecular sieve membrane; in addition, as a catalyst, the membrane of a core-shell structure catalyst coated with MSU-1 molecular sieve membrane The coating on the catalyst surface requires certain mechanical strength and heat resistance, but the synthesis method reported in the literature cannot meet this requirement.

Method used

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  • A preparation method of coated pure silicon mesoporous MSU-1 molecular sieve membrane core-shell catalyst
  • A preparation method of coated pure silicon mesoporous MSU-1 molecular sieve membrane core-shell catalyst
  • A preparation method of coated pure silicon mesoporous MSU-1 molecular sieve membrane core-shell catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Preparation of alkali-resistance composite collector plate

[0029] (1) Preparation of pure silicon molecular sieve seed crystals and their covalent coupling with carriers

[0030] According to TPAOH:SiO 2 :H 2 O=25:100:2700 molar ratio to prepare Sil-1 molecular sieve seed crystal synthesis precursor solution, wherein tetrapropylammonium hydroxide (TPAOH) and deionized water are used as silicon source, tetrapropylammonium hydroxide (TPAOH) and deionized water , fully mixed and stirred at room temperature for 24 hours, poured into a stainless steel crystallization kettle lined with polytetrafluoroethylene, sealed and placed in an oven at 100°C, and taken out after 15 hours; the obtained mixed solution was centrifuged and washed with deionized water Wash it repeatedly to neutrality, and then replace it with ethanol solution to obtain Sil-1 molecular sieve seed crystals with a particle size of 150-200nm, prepare it into an ethanol suspension with a mass fract...

Embodiment 2

[0036] Example 2: MSU-1 / Ni-Al 2 o 3 Test of catalyst anti-alkali poisoning performance

[0037] The test reactor adopts a stainless steel tube (inner diameter 6mm, length 400mm), ceramic inert packing is placed at the bottom of the reactor first, and then the original catalyst and MSU-1 / Ni-Al 2 o 3 The catalyst (500-1000 mg) is placed on the packing layer (quartz wool pad) so that the catalyst layer is in the constant temperature zone of the heating furnace, and the alkali (Li 2 CO 3 with K 2 CO 3 Molar ratio is 62: 38) impregnated inert packing layer (the mass fraction of alkali concentration is 20%) is placed on the catalyst bed layer; Before reaction system feeds hydrogen (20ml / min) to carry out catalyst reduction 2~4h, according to CH 4 / H 2 O ratio 3: 1 from the upper port of the reactor (25ml: 75ml), control reaction temperature 650 ℃, gas chromatography (GC7890, TCD detector) online sampling detection H 2 , CO, CO 2 and CH 4 Component content.

Embodiment 3

[0038] Example 3: Stability test of MSU-1 molecular sieve membrane loaded on the carrier surface

[0039] MSU-1 / Ni-Al prepared without seed induction method and with seed induction method 2 o 3 The catalysts were put into the crucible together, and baked in a muffle furnace at 650°C for 10-15 hours, and the stability of the MSU-1 molecular sieve membrane loading and binding on the carrier surface could be judged by the shedding of the membrane layer.

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Abstract

The invention belongs to the field of catalysis and inorganic membrane application and relates to a method for preparing an encapsulated pure silicon mesoporous MSU-1 molecular sieve membrane core-shell catalyst. An MSU-1 / Ni-Al2O3 core-shell catalyst with continuous and uniform membrane layer is synthesized under the coactions of a rotating synthesizing process and an ion diffusion process, the stability and heat resistance of the MSU-1 molecular sieve membrane loaded on the surface of the carrier are increased by a seed crystal induction process, and the mechanical strength of the MSU-1 / Ni-Al2O3 core-shell catalyst is increased. In the invention, when the MSU-1 / Ni-Al2O3 core-shell catalyst is synthesized, the catalytic reaction of macromolecular substances can be catalyzed selectively under the sieving action of the MSU-1 molecular sieve membrane; meanwhile, the MSU-1 molecular sieve membrane can serve as a protective layer to prevent materials that can affect the activity of the catalyst in a reaction system from poisoning a core catalyst.

Description

technical field [0001] The invention belongs to the field of catalysis and inorganic membrane application, and in particular relates to a preparation method of a membrane core-shell catalyst coated with pure silicon mesoporous MSU-1 molecular sieve. Background technique [0002] In recent years, the design and controllable preparation of composite materials with core-shell structure has become a hot spot in the field of materials science. The core-shell structure material has a central core and an outer shell, and its properties are controlled by different types and properties of core and shell materials. Due to its special structure and the combination of different material properties, the core-shell composite material exhibits many outstanding advantages that other materials do not have, and has special optical, electrical, magnetic, chemical and other properties. It is used in nanomaterials, biology, It has a wide range of applications in medicine, machinery, catalysis a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/035
Inventor 张雄福张健涂敏刘海鸥邱介山
Owner DALIAN UNIV OF TECH
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