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Method for removing composite template from UZM-5 zeolite

A UZM-5, composite template technology, applied in molecular sieve compounds, chemical instruments and methods, crystalline aluminosilicate zeolite, etc., can solve the problem of not considering removal efficiency, etc., achieve high specific surface area and external surface activity, Mild conditions and simple operation

Inactive Publication Date: 2012-11-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has mild conditions and simple operation, but not all molecular sieves can achieve 100% removal of the template under this method, and this method does not consider adding suitable substances as co-catalysts to improve the removal efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Put 0.6g of synthesized UZM-5 molecular sieve former powder containing tetraethylammonium hydroxide-tetramethylammonium chloride composite organic template in a beaker, add 60ml of 10% hydrogen peroxide aqueous solution, 400ppm Fe 2+ (FeCl 2 ), 80ppm Mn 2+ (MnCl 2 ), irradiated by ultraviolet light for 3 hours, filtered and washed with deionized water after completion of the reaction. The obtained samples were characterized by XRD, TG and other means. The results show that the template agent has been removed 100%. Compared with the roasting method, the UZM-5 molecular sieve obtained by this method has good crystallinity.

Embodiment 2

[0012] Put 0.6g of synthesized UZM-5 molecular sieve former powder containing tetraethylammonium hydroxide-tetramethylammonium chloride composite organic template in a beaker, add 60ml of 10% hydrogen peroxide aqueous solution, 300ppm Fe 3+ (FeCl 3 ), 100ppm Cu 2+ (CuCl 2 ), irradiated by ultraviolet light for 3 hours, filtered and washed with deionized water after completion of the reaction. The obtained samples were characterized by XRD, TG and other means. The results show that 80% of the template agent has been removed. Compared with the roasting method, the UZM-5 molecular sieve obtained by this method has good crystallinity.

Embodiment 3

[0014] Put 0.6g of synthesized UZM-5 molecular sieve former powder containing tetraethylammonium hydroxide-tetramethylammonium chloride composite organic template in a beaker, add 60ml of 10% hydrogen peroxide aqueous solution, 400ppm Fe 2+ (FeCl 2 ), 100ppm Cr 2+ (CrCl 2 ), irradiated by ultraviolet light for 3 hours, filtered and washed with deionized water after completion of the reaction. The obtained samples were characterized by XRD, TG and other means. The results show that 90% of the template agent has been removed. Compared with the roasting method, the UZM-5 molecular sieve obtained by this method has good crystallinity.

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PUM

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Abstract

The invention provides a method for removing a composite template from UZM-5 zeolite. The method comprises the following steps: putting the synthesized UZM-5 zeolite containing a tetraethylammonium hydroxide-tetramethylammonium chloride composite template in an ultraviolet oven, adding a hydrogen peroxide solution having a amount being 0.5-15% of the weight of the zeolite, 0-500ppm of a catalyst Fe<2+> / Fe<3+> and 0-300ppm of a cocatalyst (a transition metal ion, such as Mn<2+>, Cu<2+>, Cr<2+> and Ce<3+>), stirring a reaction system, irradiating the reaction system by an ultraviolet light source, reacting at room temperature for 0.5-24h, filtering the resultant reaction solution, and washing with deionized water. Compared with existing methods for removing the organic template from the UZM-5 zeolite, the method provided in the invention has the advantages of reasonable utilization of the cocatalyst, maintenance of the good crystallization degree of the UZM-5 zeolite, efficient removal of the organic template from the zeolite, mild condition and simple operation.

Description

technical field [0001] The technology belongs to the field of inorganic porous materials, and specifically relates to a method for removing a composite template agent in UZM-5 molecular sieves. technical background [0002] UZM-5 molecular sieve, given by the International Molecular Sieve Association (IZA) as UFI, is currently the highest silicon-aluminum ratio (SiO 2 / Al 2 o 3 =3~5) molecular sieves are also currently known molecular sieves with α-cage and 5-membered ring structures. They have strong B-acid centers, high specific surface area and external surface activity. ), the alkylation reaction of benzene and propylene to produce cumene, the alkylation reaction of benzene and olefins and the isomerization reaction of xylene can play a very good catalytic role. In the process of synthesizing UZM-5 molecular sieve, tetraethylammonium hydroxide-tetramethylammonium chloride was added as a template agent, and these template agents were enclosed in the pores or cages of t...

Claims

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Application Information

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IPC IPC(8): C01B39/04C01B37/00
Inventor 李英霞丁佩王煊
Owner BEIJING UNIV OF CHEM TECH
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