Hierarchical porous titanium-silicon molecular sieve as well as preparation method thereof and olefin epoxidation method

A titanium-silicon molecular sieve and multi-stage pore technology, which is applied in the direction of molecular sieve compounds, molecular sieve catalysts, and molecular sieve characteristic silicates, can solve the problem of large molecular sieve grains with low activity, low distribution of mesopores and macropores, and crystallization of titanium-silicon molecular sieves. The degree is not high enough to achieve the effect of improving selectivity

Active Publication Date: 2018-11-02
CHINA PETROLEUM & CHEM CORP +1
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  • Application Information

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Problems solved by technology

[0006] Although the research on the preparation of hierarchical porous molecular sieves by silanization has been very abundant, only [3-trimethoxysilylpropyl] dimethyl octadecyl ammonium bromide and N-phenyl-3-aminopropyl trimethoxy Two silylating reagents based on silane are used in the synthesis of hierarch

Method used

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  • Hierarchical porous titanium-silicon molecular sieve as well as preparation method thereof and olefin epoxidation method
  • Hierarchical porous titanium-silicon molecular sieve as well as preparation method thereof and olefin epoxidation method
  • Hierarchical porous titanium-silicon molecular sieve as well as preparation method thereof and olefin epoxidation method

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Experimental program
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Embodiment 1

[0088] According to tetraethyl orthosilicate (as SiO 2 Calculated): Tetrabutyl titanate (as TiO 2 Calculated): Tetrapropylammonium hydroxide (in N): The molar ratio of deionized water is 1:0.02:0.4:20. After mixing the above materials, carry out hydrothermal treatment at 80°C for 6 hours under stirring conditions to obtain the first mixture. Then mix N-phenyl-3-aminopropyltrimethoxysilane, cetyltrimethylammonium bromide and deionized water and add polyacrylic acid (purchased from Nantong Puter Chemicals Co., Ltd., CAS No. 9007-20-9, the weight-average molecular weight is 240000) to prepare an emulsion mixture, and the obtained emulsion mixture is added to the first mixture under stirring conditions to obtain the second mixture, wherein the silylating agent, synthetic water-soluble polymer unit Body, surfactant, deionized water and the silicon source tetraethyl orthosilicate in the first mixture (as SiO 2The molar ratio of 0.02:0.15:0.4:5:1. The second mixture was transferr...

Embodiment 2

[0090] According to tetraethyl orthosilicate (as SiO 2 Calculated): Tetrabutyl titanate (as TiO 2 Calculated): Tetrapropylammonium hydroxide (in N): The molar ratio of deionized water is 1:0.04:0.05:150 After mixing the above materials, carry out hydrothermal treatment at 80°C for 10 hours under stirring conditions to obtain the first mixture. Then mix N-(2aminoethyl)-3-aminopropyltrimethoxysilane, hexadecyltrimethylammonium bromide and deionized water and add polyacrylamide (purchased from Shandong Keyu Water Treatment Co., Ltd. Co., Ltd., the CAS number is 9003-05-8, and the weight average molecular weight is 8000000) to prepare the emulsion mixture, and the obtained emulsion mixture is added to the first mixture under stirring conditions to obtain the second mixture, wherein the silylating agent, synthetic Water-soluble macromolecular monomer, surfactant, deionized water and silicon source tetraethyl orthosilicate (as SiO 2 The molar ratio of 0.2:0.05:0.3:8:1. The secon...

Embodiment 3

[0092] According to silica (SiO 2 Calculated): tetrapropyl titanate (as TiO 2 Calculated): Tetrapropylammonium hydroxide (in N): The molar ratio of deionized water is 1:0.06:1:60. After mixing the above materials, carry out hydrothermal treatment at 75°C for 7 hours under stirring conditions to obtain the first mixture. Then mix 3-(2-aminoethylamino)propyltriethoxysilane, tetradecyltrimethylammonium bromide and deionized water and add polyacrylamide (purchased from Shandong Keyu Water Treatment Co., Ltd. company, the CAS number is 9003-05-8, and the weight average molecular weight is 8,000,000) to prepare the emulsion mixture, and the obtained emulsion mixture is added to the first mixture under stirring conditions to obtain the second mixture, wherein the silylating agent, synthetic water-soluble Silicon source silica (using SiO 2 The molar ratio of 0.1:0.005:0.1:10:1. The second mixture was transferred to a pressure-resistant stainless steel reaction kettle, crystallized...

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Abstract

The invention relates to a hierarchical porous titanium-silicon molecular sieve as well as a preparation method thereof and an olefin epoxidation method. The hierarchical porous titanium-silicon molecular sieve has a grain size of 600-700 nm, has relative crystallinity of 55-64%, has a specific surface area of 660-725 m<2>/g, has a total pore volume of 0.55-0.7 cm<3>/g, and has a mesoporous volumeof 0.3-0.5 cm<3>/g; the volumes of pores with the pore diameters of 0.5-2 nm of the hierarchical porous titanium-silicon molecular sieve account for 15-36% of the total pore volume, the volumes of pores with the pore diameters of 2-4 nm account for 1-25% of the total pore volume, and the volumes of the pores with the pore diameters of 4-16 nm account for 20-45% of the total pore volume, and the volumes of the pores with the pore diameters greater than 16 nm account for 20% or lower of the total pore volume. The hierarchical porous titanium-silicon molecular sieve disclosed by the invention isgreater in mesoporous volume, is higher in proportion of the total pore volume, and can remarkably increase an olefin conversion rate and can improve selectivity of alkyleneoxide while used for olefin oxidization reaction.

Description

technical field [0001] The disclosure relates to a hierarchical porous titanium-silicon molecular sieve, a preparation method thereof, and an olefin epoxidation method. Background technique [0002] Since titanium-silicon molecular sieves were developed in the 1980s, people have successively developed titanium-containing heteroatom molecular sieve TS-1 with MFI structure, heteroatom molecular sieve TS-2 with MEL structure, and Ti-beta with BEA structure. , TS-48 with macroporous structure, MCM-41 with MWW structure and a series of titanium silicon molecular sieves with different skeleton structures. [0003] The excellent catalytic oxidation activity of titanium silicate molecular sieves is based on the Ti in the framework structure 4+ The active center, whose remarkable function is to support the H 2 o 2 The selective oxidation of the organic matter involved has a good effect, and it will not be deeply oxidized, and the product selectivity is high. It has the incomparabl...

Claims

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Application Information

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IPC IPC(8): C01B37/00B01J29/89C07D301/12C07D301/14
CPCB01J29/89C01B37/005C01P2002/72C01P2004/04C01P2006/12C01P2006/14C01P2006/17C07D301/12C07D301/14
Inventor 梅俊俊彭欣欣夏长久朱斌林民
Owner CHINA PETROLEUM & CHEM CORP
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