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ZSM-5 zeolite and synthesis method thereof

A technology of ZSM-5 and synthesis method, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problem that ZSM-5 zeolite does not contain mesopores, and achieve good propylene selection properties, high conversion rate, and low yield of heavy oil

Active Publication Date: 2012-07-18
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 ZSM-5 zeolite synthesized by the above existing methods does not contain mesopores

Method used

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  • ZSM-5 zeolite and synthesis method thereof
  • ZSM-5 zeolite and synthesis method thereof
  • ZSM-5 zeolite and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of seed crystal solution: Add 15 grams of sodium hydroxide to 310 grams of water, dissolve and make it transparent, then add 10 grams of ZSM-5 zeolite, heat to 80°C, stir for 30 minutes, replenish the water evaporated during the heating process, and obtain a crystal seed solution. Seed liquid.

[0028] Add 25 grams of sodium aluminate into 500 grams of water, dissolve and make it transparent, then add 194 grams of coarse-porous silica gel, then add seed liquid, and stir for 30 minutes to obtain a gel. The gel was transferred to a 2-liter stainless steel crystallization kettle, sealed and then dynamically crystallized at 160° C. for 30 hours with a stirring speed of 100 rpm. After suction filtration, washing and drying, a solid product was obtained. The solid product was analyzed by X-ray diffraction to be a pure phase ZSM-5 zeolite with a relative crystallinity of 102%. In the present embodiment, the mol ratio between each component of reaction mixture is a...

Embodiment 2

[0030] Preparation of seed crystal liquid: 29.6 g of NaY zeolite was added to 320 g of water, and treated for 3 minutes under the action of ultrasonic waves (frequency of ultrasonic wave was 28KHz, ultrasonic power 100w) to obtain seed crystal liquid.

[0031] Add 10.4 grams of sodium aluminate and 23.3 grams of sodium hydroxide to 400 grams of water. After dissolving and making it transparent, add 243 grams of coarse-pore silica gel, then add the seed liquid, and stir for 30 minutes to obtain a uniform gel. The gel was transferred to a 2-liter stainless steel crystallization kettle, sealed and then dynamically crystallized at 180° C. for 16 hours at a dynamic crystallization stirring speed of 100 rpm. The solid product was obtained after suction filtration, washing, and drying. The solid product is analyzed by X-ray diffraction to be a pure phase ZSM-5 zeolite (see figure 1), the relative crystallinity is 104%. In the present embodiment, the molar ratio between each componen...

Embodiment 3

[0033] Seed liquid preparation: Add 26.2 grams of sodium hydroxide to 320 grams of water, dissolve and make it transparent, then add 18.5 grams of ZSM-5 zeolite, transfer to a 1-liter stainless steel crystallization kettle, seal it and stir at 120°C for 30 minutes, then cool , to obtain the seed liquid.

[0034] Add 23.8 grams of sodium aluminate into 400 grams of water, dissolve and make it transparent, then add 369 grams of coarse-porous silica gel, then add the seed liquid, and stir for 30 minutes to obtain a uniform gel. The gel was transferred to a 2-liter stainless steel crystallization kettle, sealed and dynamically crystallized at 190° C. for 10 hours at a dynamic crystallization stirring speed of 100 rpm. After suction filtration, washing, and drying, a solid product was obtained. The solid product is analyzed by X-ray diffraction to be a pure phase ZSM-5 zeolite (see attached figure 1 ), the relative crystallinity is 101%. Its adsorption isotherm and pore distribut...

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Abstract

The invention relates to a ZSM-5 zeolite and a synthesis method thereof, wherein the middle-hole-area of the zeolite is not less than 10m<2> / g, the middle-hole-volume is not less than 0.03ml / g, and the ratio of the diffraction peak intensity at a diffraction angle 2 theta which is equal to 7.8+ / -0.2 degree in the X-ray diffraction diagram to the diffraction peak intensity at a diffraction angle 2theta which is equal to 23.0+ / -0.2 degree is more than one. The synthesis method of the zeolite comprises the following steps: mixing solid silicon source dioxide, aluminum source, alkali, water and processed seed crystals and performing crystallization. When used in catalytic cracking, the ZSM-5 zeolite is characterized by high ability of cracking macromolecules and high yields of liquefied gas and propylene.

Description

technical field [0001] The invention relates to a ZSM-5 zeolite and a synthesis method thereof. Background technique [0002] ZSM-5 zeolite was first reported by Mobil Corporation of the United States in 1972 (USP3702886), because of its high silicon-aluminum ratio, good thermal and hydrothermal stability, lipophilic and hydrophobic characteristics, and unique three-dimensional pore structure and shape-selective catalysis It has unique catalytic properties for reactions such as alkylation, isomerization, disproportionation, shape-selective reaction, catalytic cracking, methanol-to-gasoline, and methanol-to-olefins, and is widely used in the petrochemical field. [0003] The synthesis method of ZSM-5 zeolite can be generally divided into organic method and inorganic method. The so-called organic method is to use an organic template in the reaction system, and the inorganic method is to use no organic template in the reaction system. Organic templates are expensive and pollu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/38
Inventor 潘晖华罗一斌王殿中舒兴田何鸣元
Owner CHINA PETROLEUM & CHEM CORP
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