Preparation method of highly stable MSUY-41 molecular sieve

A MSUY-41, high-stability technology, applied in the field of preparation of MSUY-41 molecular sieves, can solve the problems of high price of organic templates, narrow range of silicon-aluminum ratio, complex synthesis process, etc., and achieve good hydrothermal stability, reliable The effect of large tuning range and avoiding influence

Active Publication Date: 2012-09-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although they have improved the acidity and stability of MCM-41 molecular sieves to a certain extent, the synthesis process is relatively complicated and must undergo the synthesis of precursors.
Especially in the synthesis of Beta zeolite structural units, there are many problems such as high price and large dosage of organic templates, narrow range of silicon-aluminum ratio, and long crystallization time.

Method used

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  • Preparation method of highly stable MSUY-41 molecular sieve
  • Preparation method of highly stable MSUY-41 molecular sieve
  • Preparation method of highly stable MSUY-41 molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Industrially synthesized NaY(SiO 2 / Al 2 o 3 The molecular molar ratio is 4.7, the following are all SiO 2 / Al 2 o 3 Both are molecular molar ratios) in the presence of water vapor, hydrothermal treatment at 0.2MPa and 500°C for 3 hours, and then treated with hydrochloric acid solution to obtain modified Y zeolite, SiO 2 / Al 2 o 3 =10.

[0033] Disperse 4.8g of the above-mentioned modified Y zeolite in 50mL 2M HCl solution to form a hydrogel, stir at room temperature for 4h, and adjust the pH value to about 13 with 6M NaOH; then 12.5g of 16wt% cetyltrimethyl Drop the ammonium chloride solution into the hydrogel, stir at 50°C for 40 minutes, and adjust the pH to about 10 with hydrochloric acid; stir evenly, put the material into a crystallization kettle lined with polytetrafluoroethylene, and crystallize at 110°C for 2 days; then filter, Wash and dry at 100°C for 24h; then bake at 550°C for 8h in an air atmosphere to obtain the target product. The molecular siev...

Embodiment 2

[0035] Industrially synthesized NaY was hydrothermally treated in the presence of water vapor at a pressure of 0.2MPa and 500°C for 3 hours, and then treated with hydrochloric acid solution to obtain a modified Y zeolite, SiO 2 / Al 2 o 3 =10.

[0036] Disperse 4.8g of the above-mentioned modified Y zeolite in 50mL of 3M HCl solution to form a hydrogel, stir at room temperature for 4h, and adjust the pH to 13 with 6M NaOH; then 12.5g of 16wt% cetyltrimethyl Drop the ammonium bromide solution into the hydrogel, stir at 50°C for 40 minutes, then add 7g of tetraethyl orthosilicate, and adjust the pH to about 10 with hydrochloric acid; Crystallize at ℃ for 2d; then filter, wash, and dry at 100℃ for 24h; then bake at 550℃ for 8h in an air atmosphere to obtain the target product. The molecular sieve sample whose crystal phase is MCM-41 was obtained by XRD analysis. According to IR analysis, the framework contains Y zeolite secondary structural units.

Embodiment 3

[0038] Industrially synthesized NaY was hydrothermally treated in the presence of water vapor at a pressure of 0.3MPa and 600°C for 2 hours, and then treated with hydrochloric acid solution to obtain a modified Y zeolite, SiO 2 / Al 2 o 3 =20.

[0039] Disperse 4.8 g of the above modified Y zeolite in 50 mL of 1M HNO 3 In the solution, a hydrogel was formed, stirred at room temperature for 4h, and the pH value was adjusted to 13 with 6M NaOH; then 10.8g of 25wt% cetyltrimethylammonium chloride solution was dropped into the hydrogel at 0.86mL / min Stir at 50°C for 40 minutes, adjust the pH to about 10 with acetic acid; after stirring evenly, put the material into a polytetrafluoroethylene-lined crystallization kettle, and crystallize at 110°C for 3 days; then filter, wash, and dry at 100°C 24h; and then baked at 550°C for 8h under air atmosphere to obtain the target product. The molecular sieve sample whose crystal phase is MCM-41 was obtained by XRD analysis. According to I...

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Abstract

The invention discloses a preparation method of a high stable MSUY-41 molecular sieve, comprising the following steps of: treating a Y zeolite raw material by hydrothermal treatment; adding acid to prepare hydrogel; and adding a proper amount of silicon sources and templates to carry out crystallization to obtain the MSUY-41 molecular sieve. The prepared MSUY-41 molecular sieve has a MSUY-41 molecular sieve skeleton structure, has a Y zeolite secondary structure unit in a hole wall, has obviously enhanced acidity and hydrothermal stability and can be used for the technical fields of catalyticcracking, hydrocracking, hydrotreating, hydro-upgrading, and the like.

Description

technical field [0001] The invention relates to a method for preparing MSUY-41 molecular sieve with MCM-41 molecular sieve structure, in particular to a method for preparing MSUY-41 molecular sieve by introducing Y zeolite secondary structural units into the pore wall of MCM-41. Background technique [0002] Microporous molecular sieves have a uniform and well-developed microporous structure and strong acidity. They are important shape-selective catalysts in the modern petroleum industry and have a large specific surface area (>350m 2 g -1 ), adjustable pore size (0.2-1.2nm), hydrophilicity, high thermal stability (>500°C) and chemical stability. However, due to the small pore size, it is difficult for large-diameter molecules to enter the pores, and the macromolecules formed in the pores cannot escape quickly, resulting in side reactions, thus limiting its application range. Generally speaking, microporous molecular sieves are suitable for reactions in which the kin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/04
Inventor 张海娟李江红金亮张喜文
Owner CHINA PETROLEUM & CHEM CORP
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