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Anatase-rutile mixed-phase TiO2 catalyst as well as preparation method and application thereof

A mixed-phase and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, preparation of sugar derivatives, etc., can solve instability and other problems, and achieve good structural properties, strong Lewis acidity, catalytic activity, and yield high effect

Pending Publication Date: 2021-01-26
GUANGZHOU WEIGANG ENVIRONMENT TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, Lewis acids, as high-efficiency catalysts, have also been applied in the conversion process of glucose isomerization, but homogeneous Lewis catalysts (such as AlCl 3 ,BF 3 and transition metal halides) are unstable in the aqueous phase

Method used

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  • Anatase-rutile mixed-phase TiO2 catalyst as well as preparation method and application thereof
  • Anatase-rutile mixed-phase TiO2 catalyst as well as preparation method and application thereof
  • Anatase-rutile mixed-phase TiO2 catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] An anatase-rutile mixed phase TiO 2 The preparation method of catalyst comprises the following steps:

[0037] 1) Add a titanium precursor solution with a concentration of 13mg / mL to a glucose solution with a concentration of 8% to obtain a mixed solution; wherein the titanium precursor is TiOSO 4 ;

[0038] 2) Stir and heat the solution obtained in step 1) at 150° C. and 600 rpm for 1 hour, and then filter to obtain a solid product after cooling. The solid product is washed with deionized water and then vacuum-dried at 80° C. for 8 hours;

[0039] 3) Then calcined at 500°C for 120min to remove organic impurities, and then grind the calcined solid to obtain anatase-rutile mixed phase TiO 2 catalyst. The anatase-rutile mixed phase TiO 2 TiO in the catalyst 2 The mass fraction is 8%.

[0040] In this example, the anatase-rutile mixed phase TiO 2 The catalyst is named H-TiO 2 .

Embodiment 2

[0042] An anatase-rutile mixed phase TiO 2The preparation method of catalyst comprises the following steps:

[0043] 1) Add a titanium precursor solution with a concentration of 8mg / mL to a glucose solution with a concentration of 3% to obtain a mixed solution; wherein the titanium precursor is Ti[OCH(CH 3 ) 2 ] 4 and TiBr 4 ;

[0044] 2) Stir and heat the solution obtained in step 1) at 120°C and 300rpm for 3h, filter after cooling to obtain a solid product, and wash the solid product with deionized water and then vacuum-dry it at 50°C for 8h;

[0045] 3) Then calcined at 400°C for 120min to remove organic impurities, and then grind the calcined solid to obtain anatase-rutile mixed phase TiO 2 catalyst. The anatase-rutile mixed phase TiO 2 TiO in the catalyst 2 The mass fraction is 3%.

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Abstract

The invention discloses an anatase-rutile mixed-phase TiO2 catalyst as well as a preparation method and application thereof. The anatase rutile mixed-phase TiO2 catalyst is synthesized in a glucose solution. A titanium precursor solution is added into the glucose solution, wherein the titanium precursor comprises one or more of TiOSO4, Ti[OCH(CH3)2] 4 and TiBr4; and heating, filtering, drying andcalcining are conducted, and then grinding is conducted to obtain the anatase-rutile mixed-phase TiO2 catalyst. The anatase-rutile mixed-phase TiO2 catalyst is used for catalytically hydrolyzing polysaccharide to obtain fructose. The anatase-rutile mixed-phase TiO2 catalyst prepared by the preparation method disclosed by the invention is a heterogeneous Lewis catalyst, has a large number of TiO6 octahedron and TiO4 tetrahedron sites, also has interface electron transfer from anatase TiO2 to rutile TiO2, and can show stronger Lewis acidity and catalytic activity than traditional single-phase TiO2.

Description

technical field [0001] The invention relates to the technical field of polysaccharide catalysts, in particular to an anatase-rutile mixed phase TiO 2 Catalyst and its preparation method and application. Background technique [0002] In 1923, American chemist G.N.Lewis found that the acid-base neutralization process is essentially acid H + and base OH - The process of forming a new covalent bond between them, combined with the electronic structure of acid and base, starting from the distribution and acceptance of electron pairs, puts forward the acid-base electron theory, also known as Lewis acid-base theory. Lewis believes that: acid is a substance that lacks electron pairs in the valence layer orbit and can accept electron pairs; base is a substance that has lone electron pairs and can donate electron pairs. Therefore, Lewis acid is also called electron pair acceptor (Acceptor) and Lewis base is also called electron pair donor (Donor). Common Lewis acid catalysts are Al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C07H1/00C07H3/02
CPCB01J21/063C07H1/00C07H3/02
Inventor 雷俊禧蔡珠华王志成李翔李凯欣
Owner GUANGZHOU WEIGANG ENVIRONMENT TECH CO LTD