Method for synthesizing silicon-rich ZSM-48 zeolite molecular sieve by using seed-crystal guiding method

A technology of ZSM-48 and zeolite molecular sieve, which is applied to molecular sieve catalysts, molecular sieves and alkali exchange compounds, chemical instruments and methods, etc., can solve the problems of high toxicity, high cost, and environmental pollution, and achieve high yield, low price, The effect of reducing loss

Active Publication Date: 2018-06-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of organic templates is not only toxic and expensive, but also pollutes the environment

Method used

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  • Method for synthesizing silicon-rich ZSM-48 zeolite molecular sieve by using seed-crystal guiding method
  • Method for synthesizing silicon-rich ZSM-48 zeolite molecular sieve by using seed-crystal guiding method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: the synthesis of all silicon ZSM-48 zeolite molecular sieve

[0018] First, 1.56g of solid silica gel, 0.51g of Na 2 SiO 3 9H 2 O, 0.1g of all-silicon ZSM-48 zeolite seed crystals (6%) and 1.9g of ethanol were placed in a mortar and ground for 2min, then the reaction materials were added into a polytetrafluoroethylene stainless steel reactor, and crystallized at 180°C for 1d to complete crystallization 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=1:0.07:1.5.

[0019] Its structure is ZSM-48 zeolite molecular sieve by X-ray diffraction analysis. figure 1 , and it can be seen from the scanning electron microscope that the synthesized product is rod-shaped, which is a typical morphology of ZSM-48 zeolite molecular sieve. figure 2 Scanning electron micrograph (SEM) of the synthesized product.

Embodiment 2

[0020] Embodiment 2: High-temperature synthesis of all-silicon ZSM-48 zeolite molecular sieve

[0021] First, 1.6g solid silica gel, 0.09g NaOH, 0.16g all-silicon ZSM-48 zeolite seed crystal (10%) and 0.44g 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 200°C for 8 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=1:0.04:0.5.

Embodiment 3

[0022] Embodiment 3: Low-temperature synthesis of all-silicon ZSM-48 zeolite molecular sieve

[0023] First, put 1.6g of solid silica gel, 0.31g of NaOH, 0.016g of all-silicon ZSM-48 zeolite seed crystals (1%) and 3.5g of ethanol in a mortar and grind for 2min, then add the reaction materials into a polytetrafluoroethylene stainless steel reactor In the process, crystallization at 80°C for 10 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=1:0.15:3.

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Abstract

The invention relates to the preparation of molecular sieves, and aims at providing a method for synthesizing a silicon-rich ZSM-48 zeolite molecular sieve by using a seed-crystal guiding method. Themethod for synthesizing the silicon-rich ZSM-48 zeolite molecular sieve by using the seed-crystal guiding method comprises the following steps: placing an alkali source, a silicon source, seed crystal, an organic additive and an aluminum source in a mortar to be mixed, transferring a mixture to a reactor to be crystallized after grinding; then carrying out suction filtration on a reaction productand drying to obtain ZSM-48 zeolite molecular sieve raw powder. The method for preparing the silicon-rich ZSM-48 zeolite molecular sieve disclosed by the invention greatly improves the yield and further reduces unnecessary loss in the production process because no solvent is used; and the method further avoids the use of expensive organic template agents with higher toxicity to greatly reduce thesynthesis cost, is environment-friendly in the synthesis process, and finally realizes the greening and low cost of synthesis of all-silicon and high-silicon ZSM-48 zeolite molecular sieves.

Description

technical field [0001] The invention relates to the field of molecular sieve preparation, in particular to a method for synthesizing silicon-rich ZSM-48 zeolite molecular sieves by using a seed crystal-directed method. Background technique [0002] Silica-based zeolite molecular sieve materials are widely used in petrochemical and fine chemical industries. Among them, the one-dimensional ten-membered ring zeolite molecular sieve has very important applications in industrial catalytic processes, such as catalytic dewaxing, hydrocracking and other reactions, due to its long and narrow straight pore structure. Common one-dimensional ten-membered ring zeolite molecular sieves include ZSM-22, ZSM-23, ZSM-48, EU-1, etc. Among them, the pore size of ZSM-48 zeolite molecular sieve is 0.53nm×0.56nm, which has very good thermal stability, hydrothermal stability and adjustable acidity, and has excellent performance in the above-mentioned reactions. [0003] The traditional ZSM-48 zeo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/46B01J29/70
CPCB01J29/703C01B39/46C01P2002/72C01P2004/03
Inventor 吴勤明孟祥举肖丰收
Owner ZHEJIANG UNIV
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