Preparation method of mordenite/ZSM-5 core-shell type molecular sieve material

A technology of ZSM-5 and mordenite, which is applied in the field of preparation of core-shell molecular sieve materials, can solve problems such as difficulty in compound growth, and achieve the effects of low synthesis cost, avoidance of mass use and good technical effect.

Inactive Publication Date: 2010-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem that ZSM-5 and mordenite in the prior art are difficult to co...

Method used

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  • Preparation method of mordenite/ZSM-5 core-shell type molecular sieve material
  • Preparation method of mordenite/ZSM-5 core-shell type molecular sieve material
  • Preparation method of mordenite/ZSM-5 core-shell type molecular sieve material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 110 milliliters of n-butylamine was dissolved in 480 milliliters of deionized water and stirred evenly, 320 grams of mordenite raw powder was added to this surface modifier solution, and the temperature was raised to 30 ° C under stirring and kept for 120 hours, filtered and cooled in 100 ° C air After drying in the atmosphere, the treated mordenite powder is obtained. 124 grams of water glass, 1 gram of aluminum sulfate, 18 grams of sodium chloride, 6 milliliters of sulfuric acid, 20 milliliters of ethylamine, 10 milliliters of ammonia water and 600 milliliters of water are evenly gelled to obtain the ZSM-5 zeolite molecular sieve synthesis system. Add 320 grams of processed mordenite powder into the gelling solution and stir for 2 hours. The mixed system was transferred into a polytetrafluoroethylene-lined stainless steel crystallization kettle, and statically crystallized in an oven at 120°C for 48 hours. The XRD spectrum of gained sample has the characteristic diff...

Embodiment 2

[0038] Dissolve 45 grams of tetrapropylammonium bromide in 80 milliliters of deionized water and stir evenly. Add 50 grams of mordenite raw powder into this surface modifier solution, heat up to 170° C. under stirring and keep it for 2 hours, filter and After drying in air atmosphere at 100°C, the treated mordenite powder is obtained. 124 grams of water glass, 0.38 grams of aluminum nitrate, 7.5 milliliters of nitric acid, 24 milliliters of n-butylamine, and 420 milliliters of water are uniformly gelled to obtain the ZSM-5 zeolite molecular sieve synthesis system. Add 32 grams of treated mordenite powder B into the gelling solution and stir for 2 hours. The mixed system was transferred into a polytetrafluoroethylene-lined stainless steel crystallization kettle, and statically crystallized in an oven at 135°C for 36 hours. The XRD pattern of the obtained sample has both the characteristic diffraction peaks of mordenite and ZSM-5 zeolite molecular sieve, and it can be calculate...

Embodiment 3

[0040] Add 100 g of mordenite raw powder into 120 ml of n-butylamine, raise the temperature to 80° C. under stirring and keep it for 60 hours, filter and dry in air atmosphere at 100° C. to obtain the treated mordenite powder. After 49 grams of silica gel, 2.45 grams of sodium aluminate, 18 grams of sodium chloride, 6 milliliters of sulfuric acid, 26 milliliters of ethylamine and 1200 milliliters of water are uniformly gelled, the ZSM-5 zeolite molecular sieve synthesis system can be obtained. Add 96 grams of processed mordenite powder B into the gelling solution and stir for 2 hours. The mixed system was transferred into a polytetrafluoroethylene-lined stainless steel crystallization kettle, and statically crystallized in an oven at 150°C for 24 hours. The XRD pattern of the obtained sample has both the characteristic diffraction peaks of mordenite and ZSM-5 zeolite molecular sieve, and it can be calculated that the phase content of ZSM-5 accounts for more than 60%. In the S...

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Abstract

The invention relates to a preparation method of a mordenite/ZSM-5 core-shell type molecular sieve material, mainly solving the problems that mordenite and ZSM-5 zeolite molecular sieve are difficult for compound growth in the prior art. The method comprises the following steps of: (1) treating mordenite crystal grains in a modified agent solution; (2) adding the mordenite crystal grains treated by a modified agent into a ZSM-5 synthetic system comprising a template agent R, a silicon source, an aluminum source and water, wherein the mol ratio of R2O to SiO2 is 0.05-0.5, the mol ratio of SiO2 to Al2O3 is 50-infinity, the mol ratio of SiO2 to Na2O is 2-10 and the mol ratio of H2O to SiO2 is 20-100; and (3) hydrothermally crystallizing, filtering, washing and roasting to obtain the mordenite/ZSM-5 core-shell type molecular sieve material, thus the problems are better solved. The invention can be used for industrial production of the mordenite/ZSM-5 core-shell type molecular sieve materials.

Description

technical field [0001] The invention relates to a preparation method of a core-shell molecular sieve material, in particular to a preparation method of a mordenite / ZSM-5 core-shell molecular sieve material. Background technique [0002] Zeolite molecular sieves contain regular nanopores and adjustable acidity. Since the 1960s, they have been widely used in petroleum refining and chemical fields, such as catalytic cracking, catalytic reforming, transalkylation, isomerization and alkylation Catalyzed reaction process. With the continuous development of zeolite catalytic technology, people put forward higher and higher requirements for the shape selectivity of zeolite molecular sieve catalysts. Both the inner and outer surfaces of zeolite grains contain solid acid sites. As the size of zeolite grains changes, the hydroxyl acid sites on the outer surface usually account for 3-5% of the total acid sites. The acid sites on the outer surface without spatial localization do not hav...

Claims

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Application Information

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IPC IPC(8): B01J29/80B01J29/18B01J29/40B01J35/02C01B39/26C01B39/38
Inventor 孔德金郑均林
Owner CHINA PETROLEUM & CHEM CORP
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