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Method for synthesizing all-silicon ZSM-51 zeolite by seed crystal guiding method

A technology of ZSM-51 and guided method, which is applied in chemical instruments and methods, molecular sieves and alkali exchange compounds, inorganic chemistry, etc., can solve the problems of limiting the use of all-silicon ZSM-51 zeolite, achieve good reactivity, and simple synthesis operation Ease of operation, reduction of emissions and losses

Active Publication Date: 2019-07-23
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These problems limit the use of all-silica ZSM-51 zeolite to a certain extent

Method used

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  • Method for synthesizing all-silicon ZSM-51 zeolite by seed crystal guiding method
  • Method for synthesizing all-silicon ZSM-51 zeolite by seed crystal guiding method
  • Method for synthesizing all-silicon ZSM-51 zeolite by seed crystal guiding method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Synthesis of all-silicon ZSM-51 zeolite by seed crystal method

[0021] 0.65g Na 2 SiO 3 9H 2 O, 1.50g of solid silica gel, 1.3g of ethanol and 0.017g of all-silicon ZSM-51 (accounting for 1% of the mass ratio of silicon dioxide in the silicon source) seeds are placed in a grinding mill, and then crystallized at 180°C for 1d to complete After crystallization, the product was suction filtered and dried to obtain the product. The molar ratio of each reaction raw material is as follows:

[0022] SiO 2 :Na 2 O: ethanol = 1:0.08:1.0

[0023] Obtained through XRD analysis its structure is all silicon ZSM-51 zeolite ( figure 1 ), and find out that the all-silicon ZSM-51 zeolite obtained by this method is a semi-cubic shape with a smooth surface ( figure 2 ).

Embodiment 2

[0024] Example 2: Synthesis of all-silicon ZSM-51 zeolite by seed crystal method at relatively high temperature

[0025] 0.47g Na 2 SiO 3 9H 2 O, 1.68g of solid silica gel, 2.5g of ethanol and 0.17g of all-silicon ZSM-51 (accounting for 10% of the mass ratio of silicon dioxide in the silicon source) seed crystals are placed in a grinding mill, and then crystallized at 200°C for 12h to complete After crystallization, the product was suction filtered and dried to obtain the product. The molar ratio of each reaction raw material is as follows:

[0026] SiO 2 :Na 2 O: ethanol = 1:0.06:2.0

Embodiment 3

[0027] Example 3: Synthesis of all-silicon ZSM-51 zeolite by seed crystal method at relatively low temperature

[0028] 0.95g Na 2 SiO 3 9H 2 O, 1.35g of solid silica gel, 1.9g of ethanol and 0.085g of all-silicon ZSM-51 (accounting for 5% of the mass ratio of silicon dioxide in the silicon source) seed crystals are placed in a grinding mill, and then crystallized at 160°C for 3 days to complete After crystallization, the product was suction filtered and dried to obtain the product. The molar ratio of each reaction raw material is as follows:

[0029] SiO 2 :Na 2 O: ethanol = 1:0.12:1.5

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Abstract

The invention relates to a molecular sieve preparation method, and aims at providing a method for synthesizing all-silicon ZSM-51 zeolite by a seed crystal guiding method. The method comprises the following steps: taking a silicon source, an alkali source and ethanol, mixing with all-silicon ZSM-51 zeolite seed crystal, and then placing in a mortar to grind; afterwards, transferring into a reaction kettle, and performing crystallization reaction for 12h-3d at 160-200 DEG C; enabling products to be subjected to suction filtration and dried to obtain the all-silicon ZSM-51 zeolite. According tothe method, by using nontoxic harmless ethanol as a pore passage filling agent, the seed crystal is used for guiding, and toxic organic matter is prevented from use; and synthetic operation is simpleand easy. The yield of the products can be greatly improved, and the synthetic operation is simple and easy. The prepared products keep good crystallinity and purity, and have good reaction activity.No water is added in a whole synthetic system, a solid phase state is kept all the time in the synthetic process, and unnecessary exhaust gas and waste liquor discharge and loss are reduced in the production process. The adopted inorganic raw materials are all friendly to the environment and relatively low in price, thereby having important significance in the actual chemical production field.

Description

technical field [0001] The invention belongs to a method for preparing molecular sieves, in particular to a method for synthesizing all-silicon ZSM-51 zeolite by a crystal seed-directed method. Background technique [0002] ZSM-51 zeolite was first developed and synthesized by Mobil Corporation of the United States in the 1980s. Its topology is NON. This zeolite has a six-membered ring pore structure and has certain advantages as a catalyst carrier. [0003] In the process of synthesizing ZSM-51 zeolite, it is generally necessary to use organic templates for synthesis. The organic templates commonly used are metal organic complexes, tetraethylammonium, n-propylamine, tetramethylpiperidine, trimethyl Ethylammonium, bis(trimethylene)trimethylammonium salt, etc. The use of these nitrogen-containing organic templates is not only expensive, but also has high toxicity and heavy taste. In addition, there will be a large amount of nitrogen-containing waste liquid in the process of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/46
CPCC01B39/46C01P2002/72C01P2004/03
Inventor 朱龙凤吴勤明朱杰李以名
Owner JIAXING UNIV
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