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ZSM-5/MCM-48 composite molecular sieve, preparation method and application thereof

A technology of MCM-48 and composite molecular sieves, which is applied in the field of ZSM-5/MCM-48 composite molecular sieves and its preparation, can solve the problems of cumbersome catalyst preparation process, high cost, and modulation of reaction products, and improve hydrothermal stability , Improve low-temperature activity and extend the carbon chain length

Active Publication Date: 2014-09-17
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We previously disclosed a ZSM-5 / MCM-48 molecular sieve-based catalyst prepared by a two-step crystallization method and its use in methanol to gasoline reaction (Chinese invention patent application number: 201110195525.1), but there are still catalyst preparation The process is cumbersome, the cost is high, and the reaction product needs to be further adjusted.

Method used

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  • ZSM-5/MCM-48 composite molecular sieve, preparation method and application thereof
  • ZSM-5/MCM-48 composite molecular sieve, preparation method and application thereof
  • ZSM-5/MCM-48 composite molecular sieve, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation of ZSM-5 / MCM-48 composite molecular sieve:

[0044] The molar ratio of each raw material in the preparation of ZSM-5 / MCM-48 composite molecular sieve is: TEOS:CTAB:NaOH:Al:H2O=1.0:0.12:0.4:0.0125:56.

[0045] Mix 4.459g of cetyltrimethylammonium bromide (CTAB), 1.432g of sodium hydroxide and 100.89g of deionized water, add 0.26g of aluminum isopropoxide to the above solution, stir at a constant temperature of 35°C until clear, gradually Add 21.24g tetraethyl orthosilicate (TEOS) dropwise, adjust the pH to 10-11 with 50wt% acetic acid aqueous solution, and stir for 4 hours to prepare the MCM-48 precursor solution.

[0046] ZSM-5 (Si / Al=38, Nankai Catalyst Factory) was stirred in 0.5mol / L NaOH aqueous solution at 75°C for 4h, filtered, washed until the filtrate was neutral, dried at 110°C for 12h, and calcined at 550°C for 6h. Then grind it into 280-300 mesh particles, slowly add it to the precursor solution of MCM-48, stir at room temperature for 2h, crystal...

Embodiment 2

[0053] Preparation of ZSM-5 / MCM-48 composite molecular sieve:

[0054] The molar ratio of each raw material prepared by ZSM-5 / MCM-48 composite molecular sieve is: Na 2 SiO 3 :OTAC:NaOH:Al:H 2 O=0.8:0.4:0.55:0.025:120.

[0055] Mix 13.922g of octadecyltrimethylammonium chloride (OTAC), 2.212g of sodium hydroxide with 216.45g of deionized water, add 0.511g of aluminum isopropoxide to the above solution, stir at a constant temperature of 35°C until clear, gradually Add dropwise 9.765 sodium silicate (Na 2 SiO 3 ), adjust the pH=10-11 with 50wt% acetic acid aqueous solution, stir for 4h, and prepare the MCM-48 precursor solution.

[0056] ZSM-5 (Si / Al=38, Nankai Catalyst Factory) was treated in 0.3mol / L NaF aqueous solution, stirred at 60°C for 6h, filtered, the filtrate was washed until neutral, dried at 100°C for 16h, and calcined at 550°C for 6h. Then grind it into 280-300 mesh particles, slowly add it to the precursor solution of MCM-48, stir at room temperature for 2h, ...

Embodiment 3

[0060] Preparation of ZSM-5 / MCM-48 composite molecular sieve:

[0061] The molar ratio of each raw material prepared by ZSM-5 / MCM-48 composite molecular sieve is: Na 2 SiO 3 :CTAB:NaOH:Al:H 2 O=1.4:0.75:0.7:0.0355:165.

[0062] 27.333g cetyltrimethylammonium bromide (CTAB) 2.812g sodium hydroxide mixed with 297.02g deionized water, 1.215g aluminum sulfate (Al 2 (SO4) 3 ) into the above solution, stirred at a constant temperature of 35°C until clear, then added 17.088 sodium silicate (Na 2 SiO 3 ), adjust the pH=10-11 with 50wt% acetic acid aqueous solution, stir for 4h, and prepare the MCM-48 precursor solution.

[0063] ZSM-5 (Si / Al=38, Nankai Catalyst Factory) was treated in 0.7mol / L NaOH aqueous solution, stirred at 80°C for 3h, filtered, the filtrate was washed until neutral, dried at 120°C for 10h, and calcined at 550°C for 6h. Then grind it into 280-300 mesh particles, slowly add it to the precursor solution of MCM-48, stir at room temperature for 2h, crystallize ...

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Abstract

The invention relates to methanol-to-gasoline catalysts, in particular to a ZSM-5 / MCM-48 composite molecular sieve, a preparation method and application thereof. The composite molecular sieve adopts a ZSM-5 microporous molecular sieve as the seed crystal, on the surface of which a MCM-48 mesoporous structure composite molecular sieve that is chemically interlinked at a mesoporous and micropore interface is obtained by overgrowth. The composite molecular sieve undergoes acidification, and then is mixed with a binder to undergo molding and roasting, and the product is used as a catalyst for methanol-to-gasoline (MTG) reaction. The catalyst provided by the invention is used for overgrowth of the mesoporous molecular sieve on the microporous molecular sieve surface, integrates the advantages of the microporous material and the mesoporous material so as to develop the strong points and avoid the weak points and reach a synergistic effect. The catalyst shows good catalytic properties to the methanol-to-gasoline (MTG) reaction, has high selectivity to gasoline products and a low aromatic hydrocarbon content, and extends the carbon chain length. More importantly, the problems of high reaction temperature, high aromatic hydrocarbon content in oil products, and limitation of hydrocarbon compounds only to less than C11 in traditional MTG technologies are solved.

Description

technical field [0001] The invention relates to a catalyst for methanol-to-gasoline, in particular to a ZSM-5 / MCM-48 composite molecular sieve and its preparation method and application. Background technique [0002] As we all know, microporous zeolite molecular sieve has become an important shape-selective catalyst in modern petrochemical industry because of its good molecular shape selectivity and acid catalytic performance. However, its narrow pore structure affects the rapid diffusion and overflow of macromolecular products, thus limiting the distribution of products. With the gradual increase in oil quality, the limitation of the pore size of microporous molecular sieves has become more prominent. Therefore, solving the problem of reaction and diffusion of macromolecules has become one of the most important technical issues in the field of petroleum processing in the world. [0003] In recent years, Al-containing mesoporous molecular sieves have attracted attention as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80C10G3/00
CPCY02P30/20
Inventor 吴晋沪狄佐星李建青苗鹏杰李琢张东柯
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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