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Synthesis method of ZSM-5/beta nuclear shell-shaped molecular sieve

A technology of ZSM-5 and synthesis method, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low product shell coverage, expensive raw materials, etc., and achieve reduced synthesis costs and good technology effect of effect

Active Publication Date: 2010-11-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the raw materials used in the existing synthetic ZSM-5 / β core-shell molecular sieve technology are expensive, and the product shell coverage is low (only 5%). A new ZSM-5 / β core-shell molecular sieve technology is provided. Synthesis method of 5 / β core-shell molecular sieve

Method used

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  • Synthesis method of ZSM-5/beta nuclear shell-shaped molecular sieve
  • Synthesis method of ZSM-5/beta nuclear shell-shaped molecular sieve
  • Synthesis method of ZSM-5/beta nuclear shell-shaped molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 5 grams of PDDA (20%wt) were dissolved in 495 milliliters of deionized water and stirred evenly, and the former powder of 320 grams of ZSM-5 was used as the nuclear phase molecular sieve (SiO 2 / Al 2 o 3 =100) into the surface modifier solution, heated to 30°C under stirring and maintained for 3 hours, filtered and dried in an air atmosphere at 100°C, added to the β zeolite nanocrystal suspension for pre-adhesion for 120 minutes, filtered And after drying in air atmosphere at 100°C, the treated ZSM-5 powder is obtained. Zeolite beta can be obtained after 40 grams of tetraethyl orthosilicate, 8 grams of sodium aluminate, 18 grams of sodium chloride, 6 milliliters of sulfuric acid, 20 milliliters of tetraethylammonium hydroxide, 10 milliliters of ammonia and 400 milliliters of water are evenly gelled. Molecular sieve synthesis system. Add 320 grams of treated ZSM-5 powder into the gelling solution and stir for 2 hours. The mixed system was transferred into a polytetra...

Embodiment 2～15

[0035] Examples 2-15 are based on the synthesis ratio and synthesis conditions in Table 1, and are synthesized according to the similar method and steps of Embodiment 1 to obtain core-shell molecular sieves CS2-15#, and according to the method similar to Example 1 to prepare the core crystal catalyst Cat.0 and core-shell molecular sieve catalysts CS-Cat2~15#, see Table 1 for details.

[0036] Table 1 Preparation conditions of core-shell molecular sieves

[0037]

[0038] Table 2 Core-shell catalyst preparation conditions

[0039] Core-shell molecular sieve catalyst

[0040] Core-shell molecular sieve catalyst

Embodiment 16～23

[0042] Catalysts CS-Cat2-CS-Cat12 prepared in Examples 2-15 were tested on the catalytic cracking reaction activity of 1,3,5-trimethylbenzene on a fixed-bed reaction evaluation device, see Table 3 for details. The catalyst loading is 3.0 grams and the gravimetric space velocity is 1.0 hours -1 , the reaction temperature is 380° C., the reaction pressure is 0.5 MPa, and the molar ratio of hydrogen to hydrocarbon is 6.0. The result of the reaction is as follows:

[0043] Table 3 1,3,5-trimethylbenzene reaction performance of core-shell molecular sieves

[0044] Catalyst number

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Abstract

The invention relates to a synthesis method of a ZSM-5 / beta nuclear shell-shaped zeolite molecular sieve, mainly solving the problems of expensive raw materials used by the ZSM-5 / beta nuclear shell-shaped molecular sieve, low shell coverage of the product and the like existing in the prior art. The synthesis method comprises the following steps of carrying out surface pretreatment and beta nano crystal adsorption to ZSM-5 nuclear-phase molecular sieve as a seed crystal and then adopting at least one of water glass, silica sol, sodium silicate, white carbon black or activated clay as a silicon source to prepare the ZSM-5 / beta nuclear shell-shaped zeolite molecular sieve with high shell coverage. The invention adopting the technical scheme solves the problems well and can be used for industrially preparing the ZSM-5 / beta nuclear shell-shaped zeolite molecular sieve.

Description

technical field [0001] The invention relates to a method for synthesizing a ZSM-5 / beta core-shell type zeolite molecular sieve. Background technique [0002] Zeolite molecular sieve is a kind of microporous crystal material with skeleton structure. It has specific size and shape of pore structure, large specific surface area and strong adjustable acidity. It is widely used in the process of petroleum refining and processing. Such as catalytic cracking, alkane isomerization, catalytic reforming and toluene disproportionation and other catalytic reactions. [0003] Generally speaking, while improving the selectivity of the catalyst in the reaction process, it often results in a significant decline in the activity of the catalyst. Therefore, in order to improve the selectivity of molecular sieve catalysts while reducing the loss of catalyst activity, researchers have conducted a lot of research on the modification of zeolite molecular sieves. Due to its unique three-dimension...

Claims

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Application Information

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IPC IPC(8): C01B39/02B01J29/06
Inventor 孔德金祁晓岚童伟益
Owner CHINA PETROLEUM & CHEM CORP
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