Titanium silicalite molecular sieve and modification method and application thereof

A titanium-silicon molecular sieve and modification technology, applied in molecular sieve catalysts, chemical instruments and methods, organic chemistry and other directions, can solve the problems of low hydrophobicity of molecular sieves, easy loss of titanium species, poor performance, etc. Simple, reduced time effects

Active Publication Date: 2021-10-01
XIAN AERONAUTICAL UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Studies have shown that the isolated four-coordinated framework titanium in TS-1 molecular sieves is the active center for catalytic oxidation, and most of the framework titanium species are located in the pores of molecular sieves. Therefore, the prior art usually uses TS-1 as a catalyst, H

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment provides a method for modifying a titanium-silicon molecular sieve, comprising the following steps:

[0033] The titanium-silicon molecular sieve TS-1 prepared by the classical method was roasted at 500°C for 8 hours, and then after cooling, 1000g of the roasted TS-1 was mixed with 10g of sodium hydroxide and 50g of monosilane and placed in a ball mill together. , under a nitrogen atmosphere, at a temperature of 60° C., using a ball with a diameter of 5 mm and a rotational speed of 500 r / min for 6 hours to obtain a ball-milled titanium-silicon molecular sieve.

[0034] The ball-milled titanium-silicon molecular sieve is evenly dispersed in the alkaline solution, then reacted at 120°C for 10 hours, filtered, and the filter residue is rinsed with deionized water until the pH of the washing liquid is neutral, then placed in an oven at 60°C Dry in medium for 3 hours to obtain a preliminary modified titanium-silicon molecular sieve.

[0035] Under an argon a...

Embodiment 2

[0040] This embodiment provides a method for modifying a titanium-silicon molecular sieve, comprising the following steps:

[0041] The titanium-silicon molecular sieve TS-1 prepared by the classical method was roasted at 400°C for 20 hours, and then after cooling, 1000g of the roasted TS-1 was mixed with 30g of sodium hydroxide and 70g of monosilane and placed in a ball mill together. , under a nitrogen atmosphere, at a temperature of 30° C., with a grinding ball with a diameter of 3 mm, at a speed of 600 r / min, for 12 hours to obtain a ball-milled titanium-silicon molecular sieve.

[0042] The ball-milled titanium-silicon molecular sieve is evenly dispersed in the alkaline solution, then reacted at 80°C for 18 hours, filtered, and the filter residue is rinsed with deionized water until the pH of the washing liquid is neutral, then placed in an oven at 60°C Dry in medium for 3 hours to obtain a preliminary modified titanium-silicon molecular sieve.

[0043] In an argon atmos...

Embodiment 3

[0048] This embodiment provides a method for modifying a titanium-silicon molecular sieve, comprising the following steps:

[0049] The titanium-silicon molecular sieve TS-1 prepared by the classical method was roasted at 600°C for 3 hours, and then after cooling, 1000g of the roasted TS-1 was mixed with 50g of sodium hydroxide and 100g of monosilane and placed in a ball mill together. , under a nitrogen atmosphere, at a temperature of 80° C., using a grinding ball with a diameter of 3 mm at a speed of 300 r / min for 1 h to obtain a ball-milled titanium-silicon molecular sieve.

[0050] The ball-milled titanium-silicon molecular sieve is evenly dispersed in the alkaline solution, then reacted at 160°C for 3 hours, filtered, and the filter residue is rinsed with deionized water until the pH of the washing liquid is neutral, then placed in an oven at 60°C Dry in medium for 3 hours to obtain a preliminary modified titanium-silicon molecular sieve.

[0051] Under an argon atmosphe...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a titanium silicalite molecular sieve and a modification method and application thereof, and belongs to the technical field of petrochemical engineering, and the modification method comprises the following steps: 1, pretreating the titanium silicalite molecular sieve, then mixing the pretreated titanium silicalite molecular sieve with silane and alkali metal hydroxide, and then carrying out ball milling treatment to obtain the titanium silicalite molecular sieve subjected to ball milling treatment; 2, uniformly dispersing the ball-milled titanium silicalite molecular sieve in an alkali solution, and then performing reacting at the temperature of 80-160 DEG C for 3-18 hours to obtain a primarily modified titanium silicalite molecular sieve; 3, in an inert gas atmosphere, carrying out heat preservation on the primarily modified titanium silicalite molecular sieve at the temperature of 500-800 DEG C for 4-36 hours to complete modification of the titanium silicalite molecular sieve. The modification method provided by the invention is simple to operate, and the prepared titanium silicalite molecular sieve has strong hydrophobicity, titanium species are not easy to lose, the stability is good, and the catalytic performance in propylene and hydrogen peroxide gas phase epoxidation reaction is good.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a titanium-silicon molecular sieve (TS-1) and its modification method and application. Background technique [0002] Titanium silicate molecular sieve is a kind of silicate zeolite containing titanium heteroatoms in the crystal framework. Among them, TS-1 is an extremely important member of the titanium-silicon molecular sieve family. Taramasso et al. first reported the preparation of TS-1 molecular sieve by hydrothermal synthesis in 1983. It has an MFI topology, and the TS-1 molecular sieve channel is formed by the intersection of zigzag ten-membered ring channels and straight ten-membered ring channels. Three-dimensional ten-membered ring channel system. [0003] Studies have shown that the isolated four-coordinated framework titanium in TS-1 molecular sieves is the active center for catalytic oxidation, and most of the framework titanium species are located in...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B01J29/89C07D301/12C07D303/04
CPCB01J29/89C07D301/12C07D303/04B01J2229/186
Inventor 方向青李雅王思雅王世豪王嘉辉
Owner XIAN AERONAUTICAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap