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HZSM-5 molecular sieve as well as preparation method and application thereof

A technology of molecular sieve and crystallization reaction, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of high cost and complicated synthesis route, and achieve reduction of synthesis cost and simplification of synthesis The effect of technology and broad application prospects

Pending Publication Date: 2021-03-09
CHINA ENERGY GRP NINGXIA COAL IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of HZSM-5 molecular sieve and its preparation method and application in order to overcome the problem of complex synthesis route and high cost of HZSM-5 molecular sieve existing in the prior art

Method used

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  • HZSM-5 molecular sieve as well as preparation method and application thereof
  • HZSM-5 molecular sieve as well as preparation method and application thereof
  • HZSM-5 molecular sieve as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Add 17.55g of silica sol and 0.3509g of urea into 73.27g of deionized water, and then stir for 0.5h at a stirring rate of 200r / min to obtain A solution;

[0048] Add 0.3575g of seed crystals and 0.9751g of aluminum nitrate into 8.071g of ethanol, and then stir for 0.5h at a stirring rate of 200r / min to obtain B solution;

[0049] Under the condition of a stirring rate of 300r / min, slowly add the B solution to the A solution, after the dropwise addition, continue to stir for 1h to obtain a uniform gel;

[0050] The gel was transferred to a stainless steel crystallization kettle with polytetrafluoroethylene lining, crystallized at 160°C for 24h, then cooled to room temperature, filtered and washed to neutrality, and then dried at 80°C for 12h to obtain HZSM- 5 molecular sieves.

[0051] The molar ratio of each material in the present embodiment is shown in Table 1, and the obtained HZSM-5 molecular sieve is as follows figure 1 shown.

Embodiment 2-9

[0053] According to the method of embodiment 1, the difference is that the material ratio of each raw material is as shown in table 1.

Embodiment 10

[0055] According to the method of Example 1, the difference is that the crystallization temperature is 150° C., and the crystallization time is 24 h.

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Abstract

The invention relates to an HZSM5 molecular sieve as well as a preparation method and application thereof. The method comprises the following steps of: (1) mixing water, a silicon source and an alkalisource to obtain a solution A, mixing ethanol, seed crystals and an aluminum source to obtain a solution B; and (2) uniformly mixing the solution B and the solution A, and then carrying out crystallization reaction. The silicon source is metered on the basis of silicon dioxide, and the molar ratio of the ethanol to the silicon source is 0.5-2.5: 1. According to the HZSM-5 molecular sieve as wellas the preparation method and application thereof, the HZSM-5 molecular sieve with high crystallinity is obtained through a one-step crystallization method by adopting the ethanol as a template agentand controlling the use amounts of the ethanol and the silicon source within a specific range, so that the synthesis process of the HZSM-5 molecular sieve is simplified, the synthesis cost is reduced,no waste liquid is generated, and the method is environmentally friendly and has a wide application prospect.

Description

technical field [0001] The invention relates to the field of preparation of HZSM-5 molecular sieves, in particular to a HZSM-5 molecular sieve and its preparation method and application. Background technique [0002] HZSM-5 is one of the most important molecular sieve catalytic materials because of its unique MFI-type pore structure, good hydrothermal stability, good ion exchange performance and adjustable surface properties, and is widely used in petroleum processing, Catalytic fields such as coal chemical industry and fine chemical industry. [0003] At present, HZM-5 molecular sieves are mainly synthesized by liquid phase (solid-liquid system), solid phase synthesis (solid-solid system) and steam phase synthesis. Among them, the hydrothermal synthesis method mainly uses quaternary ammonium salt cations or organic amine molecules as templates to synthesize HZSM-5. These two types of templates have strong structure-guiding effects, but are more expensive. [0004] CN10560...

Claims

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Application Information

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IPC IPC(8): C01B39/40
CPCC01B39/40C01P2002/72
Inventor 张胜硕马丽萍金政伟雍晓静张伟黄克旺武燕娟王倩
Owner CHINA ENERGY GRP NINGXIA COAL IND CO LTD
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