Method for modification of zeolite molecular sieve outer surface acidity

A zeolite molecular sieve and outer surface technology, applied in molecular sieve catalysts, chemical instruments and methods, hydrocarbons, etc., can solve the problems of repeated repetition and low loading efficiency, and achieve the effect of eliminating acidity and high efficiency.

Inactive Publication Date: 2007-03-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem to be solved by the present invention is to overcome the disadvantages of low loading efficiency and the need for multiple repetitions of the traditional silanization method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 2

[0013] The catalyst prepared by liquid phase chemical impregnation method was used as reference. Take nano HZSM-5 at 40Kg / cm -2 Press down to form a tablet, break it into 10-20 mesh, weigh about 3.0 grams of 10-20 mesh HZSM-5, impregnate 2.6ml, 1.0mol / l cyclohexane solution of tetraethyl orthosilicate, and place it in an oven at 120°C Dry for 30 minutes, cool to room temperature, and then carry out the second impregnation, that is, add 2.6 ml, 1.0 mol / l cyclohexane solution of ethyl orthosilicate. Dry at 120°C for 30 minutes, calcine at 340°C for 1 hour, and 540°C for 5 hours. The catalyst prepared in this way is marked as INH-1.

[0014] Reference example 3

[0015] The catalyst prepared by liquid phase chemical impregnation method was used as reference. Take 3.0g of INH-1 catalyst and impregnate 2.6ml, 1.0mol / l cyclohexane solution of tetraethyl orthosilicate, dry in an oven at 120°C for 30 minutes, cool to room temperature and then impregnate for ...

Embodiment 1

[0017] Will be at 40Kg / cm -2 The nanometer HZSM-5 formed by pressing down is crushed into 10-20 meshes, 3.0 grams is taken and placed in a crucible, and 2.6 ml, 2.0 mol / l cyclohexane solution of ethyl orthosilicate is added. Put the crucible into a polytetrafluoro-lined crystallization kettle (volume 100ml), keep the temperature at 170°C for 12 hours, and then cool to room temperature. Loosen the crystallization kettle and take out the crucible, bake at 340°C for 1 hour and 540°C for 5 hours, and the prepared catalyst is marked as CRD-1.

Embodiment 2

[0019] Using the catalyst CRD-1 prepared in Example 1 as the matrix, repeat the loading process once to prepare CRD-2. The specific operation steps are as follows: 3.0 grams of 10-20 mesh CRD-1 are placed in a crucible and 2.6ml of 1.0mol / l Cyclohexane solution of ethyl orthosilicate. Put the crucible into a crystallization kettle (100 ml) with a Teflon liner, keep the temperature at 170° C. for 12 hours, and then cool to room temperature. Loosen the crystallization kettle, take out the crucible, and bake at 340°C for 1 hour and 540°C for 5 hours. The catalyst prepared in this way is marked as CRD-2.

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Abstract

The invention relates to a method for using chemical reaction deposit to decorate the outer surface acid of ZSM-5 zeolite. Wherein, said method is characterized in that the silicone grease and the molecule screen are reacted in sealed container at 140-170Deg.C to be cooled and baked; and it uses cyclohexane solution of ethyl orthosilicate at 1-2.0mol / l; therefore, the silicon atom of ethyl orthosilicate can be completely carried by the molecule screen; and then left slag will not contain silicone grease. The invention has high carry efficiency of silicone grease, that only carrying the micrometer ZSM-5 one time while the opposite selectivity of catalyst can reach 90%, and carrying nanometer ZSM-5 two times while the opposite selectivity of catalyst can reach 90%.

Description

technical field [0001] The invention belongs to the technical field of industrial catalysis and relates to the modification of zeolite molecular sieves, in particular to a method for modifying the acidity of the outer surface of ZSM-5 zeolite by chemical reaction deposition. Background technique [0002] The acidity of the outer surface of the molecular sieve is unfavorable to the shape selection of the molecular sieve. Taking the disproportionation reaction of toluene as an example, only p-xylene can diffuse out of the pores of ZSM-5 among xylenes, while m-xylene and o-xylene cannot. . If the acid sites on the outer surface exist, the p-xylene diffused from the pores is isomerized into m-xylene and o-xylene under the action of the acid sites on the outer surface. To obtain the target product p-xylene, it is necessary to eliminate the acid sites on the outer surface. [0003] Silanization is a commonly used method for modifying the acidity of the outer surface of zeolite m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/06B01J31/02C07C6/12C07C15/08
CPCY02P20/52
Inventor 王祥生王坤院李钢
Owner DALIAN UNIV OF TECH
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