Preparation of zeolite/mullite composite hollow microsphee by using fly-ash hollow imcrobead

The technology of hollow microbeads and hollow microspheres is applied in molecular sieves and alkali exchange compounds, inorganic chemistry, non-metallic elements, etc., and can solve the problems of insufficiency of economical and simple methods, unpractical zeolite, waste of energy, etc. High utilization rate and environment-friendly effect

Inactive Publication Date: 2005-05-25
FUDAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

There have been reports on the direct hydrothermal treatment of fly ash or indirect use of fly ash to synthesize zeolite in combination with other methods such as alkali fusion, but these methods or the prepared zeolite are not very practical, or the method is not economical and simple enough, such as the alkali fusion method requires a higher temperature, wastes a lot of energy

Method used

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  • Preparation of zeolite/mullite composite hollow microsphee by using fly-ash hollow imcrobead
  • Preparation of zeolite/mullite composite hollow microsphee by using fly-ash hollow imcrobead
  • Preparation of zeolite/mullite composite hollow microsphee by using fly-ash hollow imcrobead

Examples

Experimental program
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example 1

[0023] Fly ash hollow microspheres (containing SiO2) provided by Henan Fly Ash Research Center 2 56.21%, Al 2 o 3 29.45%, the main crystal phase is mullite and quartz, select the hollow microspheres with a diameter of less than 100μm as an example), firstly adsorb a layer of FAU seed crystals with a size of about 100nm, and put 0.08g of fly ash hollow microspheres adsorbed with FAU seeds Mix it with 1ml of 2M NaOH solution and put it into a 15ml polytetrafluoroethylene-lined reaction kettle, seal it and crystallize at 100°C for 48 hours, wash and dry to obtain a sample, and XRD (Rigaku D / max-IIA x-ray powder Diffractometer) and SEM (Philips XL 30 Scanning Electron Microscope) characterization detection, XRD spectrum and SEM figure are shown in the accompanying drawings.

example 2

[0025] The LTA seed crystal with a size of about 200nm is used instead of the FAU seed crystal, and the other experimental procedures are the same as above, and the XRD spectrum and SEM image are shown in the attached figure.

example 3

[0027] With 1ml of aluminum-containing solution (NaOH:NaAlO 2 :H 2 O=9:1:250 molar ratio) replaces NaOH solution, and other experimental steps are with example 2, and XRD spectrum and SEM figure are shown in accompanying drawing.

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Abstract

The invention relates to a method for preparing zeolite FAU / mullite and LTA / mullite composite zeolite hollow microspheres by inducing in-situ hydrothermal crystallization with fly ash hollow microspheres as raw materials. Fly ash is the fine dust emitted by coal-fired power plants and other solid fuels, and the discharged solid waste contains a large number of glass bodies with hollow structures, called fly ash hollow microspheres. In the present invention, two different small particle zeolites, FAU or LTA, are used as crystal seeds, and are hydrothermally crystallized in an aluminum-containing or aluminum-free NaOH alkali solution, so that the active silicon-aluminum component in the fly ash hollow microspheres is crystallized into zeolite , while the inert mullite cannot be converted, and the original hollow structure is maintained, so that the composite hollow microspheres supported by the outer layer of dense zeolite membrane and the inner layer of mullite macropores are prepared.

Description

technical field [0001] The invention is a method for preparing zeolite FAU / mullite and LTA / mullite composite hollow microspheres by using fly ash hollow microspheres as raw material seed crystals to induce in-situ hydrothermal crystallization. Hollow zeolite microspheres are a new type of material with low density, high specific surface area, good thermal stability, and good surface permeability. Capsules, etc. have been used. Background technique [0002] Fly ash is fine dust emitted by burning solid fuels in coal-fired power plants. The amount is large. Improper treatment will increase the smoke and pollute the atmosphere; if the discharged solid waste is discharged into the water system, it will cause river silting. The harmful Substances can also pose hazards to humans and living organisms. China's coal-fired power plants emit a large amount of ash every year, and the ash accumulated over the years not only seriously pollutes the environment, but also occupies land, po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/50
Inventor 王德举唐颐夏建超
Owner FUDAN UNIV
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