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Application of natural stilbite in preparation of CHA molecular sieve and preparation method of CHA molecular sieve

A technology of stilbite and molecular sieve, which is applied in the field of molecular sieve preparation and can solve the problem of high cost of raw materials

Active Publication Date: 2021-08-06
JILIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation of CHA-type molecular sieves in the prior art requires the use of purified silicon sources and aluminum sources, such as silica sol, alumina, etc. These silicon sources and aluminum sources generally come from various natural minerals; natural minerals are extracted to obtain silicon Aluminum source and aluminum source are used as raw materials for the preparation of molecular sieves, and the cost is high

Method used

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  • Application of natural stilbite in preparation of CHA molecular sieve and preparation method of CHA molecular sieve
  • Application of natural stilbite in preparation of CHA molecular sieve and preparation method of CHA molecular sieve
  • Application of natural stilbite in preparation of CHA molecular sieve and preparation method of CHA molecular sieve

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preparation example Construction

[0036] The invention also provides a preparation method of CHA molecular sieve, the preparation raw material includes natural stilbite.

[0037] In the present invention, the preparation method of the CHA molecular sieve further preferably comprises the following steps:

[0038] Mixing the preparation raw materials and water for the first time to obtain the preparation raw material dispersion;

[0039] Mixing the prepared raw material dispersion and the CHA seed crystal for a second time to obtain a precursor dispersion;

[0040] Static crystallization is performed on the precursor dispersion liquid to obtain the CHA type molecular sieve.

[0041] In the present invention, unless otherwise specified, the raw materials used in the present invention are preferably commercially available products.

[0042] In the present invention, the preparation raw material is first mixed with water to obtain the dispersion liquid of the preparation raw material.

[0043] In the present inv...

Embodiment 1

[0056] 0.500 gram of STI type molecular sieves (purchased from Guilin Hsinchu Nature Biomaterials Co., Ltd., particle size is 800 mesh, and the molar ratio of silicon to aluminum is 2.5), 0.450 gram of potassium hydroxide and 8 milliliters of distilled water are added in the reaction vessel, in airtight , room temperature, and 200 rpm under the condition of stirring for 20 min to obtain the prepared raw material dispersion; add 0.060 gram of CHA seed crystals (purchased from Dalian Zhuoran Environmental Protection Technology Co., Ltd., the molar ratio of silicon to aluminum is 3.0, the particle size 25000 mesh), stirred for 5min under the conditions of airtight, room temperature and 200rpm to obtain the precursor dispersion (the molar ratio of silicon dioxide, aluminum oxide, potassium hydroxide and water in the precursor dispersion is 1: 0.2:1.87:80), the precursor dispersion was statically crystallized at 120°C for 3 days; after the static crystallization was completed, it wa...

Embodiment 2

[0058] 0.500 gram of STI type molecular sieve (purchased from Guilin Hsinchu Nature Biological Materials Co., Ltd., particle size is 400 mesh, and the molar ratio of silicon to aluminum is 2.6), 0.450 gram of potassium hydroxide and 10 milliliters of distilled water are added in the reaction vessel, in airtight , room temperature, and stirred for 10 min under the conditions of 300 rpm to obtain a raw material dispersion; add 0.005 gram of CHA seed crystals (purchased from Dalian Zhuoran Environmental Protection Technology Co., Ltd., the molar ratio of silicon to aluminum is 3.0, and the particle size is 25000 mesh), stirred for 5min under airtight conditions at room temperature and 300rpm to obtain a precursor dispersion (the molar ratio of silicon dioxide, aluminum oxide, potassium hydroxide and water in the precursor dispersion is 1: 0.2:1.87:123), the precursor dispersion liquid was statically crystallized at 170°C for 1 day; after the static crystallization was completed, i...

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Abstract

The invention belongs to the technical field of natural stilbite, and provides an application of natural stilbite in preparation of a CHA molecular sieve and a preparation method of the CHA molecular sieve. The invention provides a new application of the natural stilbite, and the resource utilization range of the natural stilbite isbroadened. The invention provides a preparation method of the CHA molecular sieve. The method comprises: mixing preparation raw materials and water to obtain a preparation raw material dispersion liquid, the preparation raw materials comprise natural stilbite and potassium hydroxide; mixing the prepared raw material dispersion liquid with CHA seed crystal to obtain precursor dispersion liquid; and carrying out static crystallization on the precursor dispersion liquid to obtain the CHA type molecular sieve. According to the preparation method provided by the invention, natural stilbite is taken as the raw material, so that the preparation cost of the molecular sieve is reduced; and meanwhile, the CHA molecular sieve obtained by the method has relatively high crystallinity.

Description

technical field [0001] The invention relates to the technical field of molecular sieve preparation, in particular to the application of natural stilbite in the preparation of CHA molecular sieves and the preparation method of CHA molecular sieves. Background technique [0002] Natural zeolite is a kind of natural aluminosilicate ore. It is called zeolite because it emits a large amount of water vapor when it is burned to produce a phenomenon similar to boiling. Because there are many impurities in natural zeolite, even if it has a large specific surface area and porosity, it needs to be modified when it is used as an adsorption material or a filler. Although modification treatment can expand the application range of natural zeolites, because molecular sieves with specific structure types have been studied very maturely in the prior art, researchers tend to use synthetic molecular sieves as adsorption materials or fillers, which leads to The large stockpiling of natural zeol...

Claims

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Application Information

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IPC IPC(8): C01B39/46C01B39/02
CPCC01B39/46C01B39/02Y02P30/40
Inventor 闫文付刘雨竹白璞黄少飞郭展于吉红
Owner JILIN UNIV
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