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Method of compounding silicon-rich ZSM-5 zeolite molecular sieve with seed crystal guide method

A technology of ZSM-5 and zeolite molecular sieve, applied in the directions of crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminum silicate zeolite, etc., can solve the problems of aluminum-rich zeolite molecular sieve, and achieve improved yield and good catalytic reaction. Active, loss-reducing effect

Active Publication Date: 2018-06-22
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, however, these synthesized zeolite molecular sieves are also aluminum-rich

Method used

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  • Method of compounding silicon-rich ZSM-5 zeolite molecular sieve with seed crystal guide method
  • Method of compounding silicon-rich ZSM-5 zeolite molecular sieve with seed crystal guide method
  • Method of compounding silicon-rich ZSM-5 zeolite molecular sieve with seed crystal guide method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the synthesis of all silicon ZSM-5 zeolite molecular sieve

[0020] First, 1.6g of solid silica gel, 0.1g of NaOH, 0.16g of all-silicon ZSM-5 zeolite seed crystals (10%) and 2g of ethanol were placed in a mortar and ground for 2 minutes, and then the reaction materials were added to a polytetrafluoroethylene stainless steel reaction kettle , Crystallization at 180°C for 2 days means complete crystallization, the product is suction filtered and dried to obtain the product. The molar ratio of the reaction raw materials is as follows: SiO 2 :Na 2 O:C 2 h 5 OH=1:0.05:1.6.

[0021] Through X-ray diffraction analysis, its structure is ZSM-5 zeolite molecular sieve such as figure 1 , and it can be seen from the scanning electron microscope that the synthesized product presents a block shape, which is a typical morphology of ZSM-5 zeolite molecular sieve. figure 2 Scanning electron micrograph (SEM) of the synthesized product. image 3 It shows that no orga...

Embodiment 2

[0022] Embodiment 2: High-temperature synthesis of all-silicon ZSM-5 zeolite molecular sieve

[0023] First, 1.6g solid silica gel, 0.04g NaOH, 0.08g all-silicon ZSM-5 zeolite seed crystal (5%) and 0.63g ethanol were placed in a mortar and ground for 2min, and then the reaction materials were added to a polytetrafluoroethylene stainless steel reactor During the crystallization at 260°C for 2 hours, the crystallization was complete, and the product was filtered with suction and dried to obtain the product. The molar ratio of the reaction raw materials is as follows: SiO 2 :Na 2 O:C 2 h 5 OH=1:0.02:0.5.

Embodiment 3

[0024] Embodiment 3: Low-temperature synthesis of all-silicon ZSM-5 zeolite molecular sieve

[0025] First, 1.6g solid silica gel, 0.32g NaOH, 0.08g all-silicon ZSM-5 zeolite seed crystal (5%) and 1.4g methanol were placed in a mortar and ground for 2min, and then the reaction materials were added to a polytetrafluoroethylene stainless steel reactor In the process, crystallization at 100°C for 7 days was complete crystallization, and the product was filtered with suction and dried to obtain the product. The molar ratio of the reaction raw materials is as follows: SiO 2 :Na 2 O:C 2 h 5 OH=1:0.15:1.6.

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Abstract

The invention relates to molecular sieve preparation, and aims at providing a method of compounding a silicon-rich ZSM-5 zeolite molecular sieve with a seed crystal guide method. The method of compounding the silicon-rich ZSM-5 zeolite molecular sieve with the seed crystal guide method comprises the steps of placing an alkali source, a silicon source, a seed crystal, an organic addition agent andan R source into a mortar and conducting mixing, after grinding for two minutes, transferring a mixture into a reactor, and crystallizing the mixture at 100-260 DEG C for 2h-7d; then, conducting suction filtration on and drying a reaction product to prepare ZSM-5 zeolite molecular sieve raw powder. According to the method of compounding the silicon-rich ZSM-5 zeolite molecular sieve with the seedcrystal guide method, no solvent is adopted, thus the yield is greatly increased, unnecessary loss during production is reduced, and pollution discharge is remarkably reduced; the method further avoids the usage of expensive organic template agents, and the compounding cost is greatly reduced.

Description

technical field [0001] The invention relates to the field of molecular sieve preparation, in particular to a method for synthesizing silicon-rich ZSM-5 zeolite molecular sieves by adopting a crystal seed guiding method. Background technique [0002] Zeolite molecular sieve materials, including silica-alumina molecular sieves, phosphorus-aluminum molecular sieves, etc., are widely used in petrochemical, fine chemistry and environmental protection and other fields. Among them, MFI structure zeolite molecular sieve, as a kind of silica-alumina zeolite molecular sieve material, has good hydrothermal stability, shape selectivity, thermal stability and other advantages, so it is widely used in xylene isomerization, methanol to propylene, catalytic dewaxing Waiting for the reaction process. [0003] However, in the current synthesis process, organic templates are usually required to guide the synthesis of ZSM-5 zeolite molecular sieves. Common organic templates include tetrapropyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38
CPCC01B39/38C01P2002/72C01P2002/86C01P2004/03C01P2006/80
Inventor 吴勤明孟祥举肖丰收
Owner ZHEJIANG UNIV
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