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Process for preparing fine grain zeolite

A technology of small crystal grain and zeolite, which is applied in the field of preparation of small crystal grain NaA zeolite, can solve problems such as large synthesis cost, and achieve the effect of reducing preparation cost and improving technical effect.

Active Publication Date: 2006-12-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in the past, organic templates were used in the process of preparing A zeolite, so that the synthesis cost was relatively large, and a method for preparing small-grain NaA zeolite is provided.

Method used

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  • Process for preparing fine grain zeolite
  • Process for preparing fine grain zeolite
  • Process for preparing fine grain zeolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0015] The value of a is 6.0, the value of d is 128, and the values ​​of X are 3.0, 2.5, 2.0 and 1.5 respectively. After reacting at 90°C for 5 hours, the XRD pattern of the product shows that the product is NaA zeolite, and the SEM characterization results show that The zeolite particle size is NaA zeolite with a particle size of 300-800 nanometers.

Embodiment 5～8

[0017] The value of a is 6.0, the value of d is 128, and the value of X is 2.5. They are respectively reacted at 60°C for 8 hours, 10 hours, 12 hours and 14 hours. The XRD pattern of the product shows that the product is NaA zeolite, SEM The characterization results show that the zeolite particle size ranges are 200-300 nanometers, 200-400 nanometers, 200-500 nanometers and 300-700 nanometers. The high-magnification SEM photos show that the product particles reacted for 8 hours are composed of NaA nanocrystals smaller than 100 nanometers. Wherein the product XRD pattern of reacting 8 hours is as figure 1 As shown, the SEM image is shown in figure 2 As shown, the high-magnification SEM image is shown in image 3 shown.

Embodiment 9～12

[0019] The value of X is 2.5, the value of d is 128, and the value of a is respectively 4.0, 5.0, 7.0 and 8.0 respectively. After reacting at 60°C for 8 hours, the product XRD and SEM characterization results show that the product is less than 1 micron NaA zeolite.

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Abstract

The invention relates to a method for preparing small-grain NaA zeolite, which mainly solves the problem that an organic template is used in the process of preparing small-grain A zeolite, which causes relatively high synthesis cost. The present invention is by adopting the SiO2 precursor obtained by hydrolysis of silica sol or tetraethyl orthosilicate as a silicon source, using sodium metaaluminate as an aluminum source, and the raw material molar composition is aNa2O: XAl2O3: SiO2: dH2O, wherein a is 4~ 9. X is 0.4-4, d is 50-500, and the technical scheme of preparing NaA zeolite by hydrothermal crystallization under the conditions of crystallization temperature of 40-100°C and crystallization time of 2-72 hours is a good solution This problem can be used in the industrial preparation of small crystal A zeolite.

Description

technical field [0001] The present invention relates to a preparation method of small crystal NaA zeolite, in particular to a preparation method of small crystal NaA zeolite without any organic additives. Background technique [0002] Zeolite is a crystalline aluminosilicate with properties such as large specific surface area, high hydrothermal stability, rich and uniform micropores, etc. It is widely used as catalyst, adsorbent, ion exchanger and new functional material. Small-grain zeolite molecular sieves have large external specific surface area and short intra-crystalline pores, so they may have incomparable properties of many large-grain zeolites: when used as a catalyst, the reactant molecules can easily reach the catalytic active site, and The generated product can quickly diffuse out of the pores, and has superior performance in improving the utilization rate of the catalyst, enhancing the conversion ability of macromolecules, reducing th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/14B01J29/06
Inventor 王德举唐颐刘仲能谢在库张惠宁
Owner CHINA PETROLEUM & CHEM CORP