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Alcohol photo-oxidization catalyst, and preparation method and application thereof

A catalyst, photo-oxidation technology, applied in the direction of physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, carbon-based compound preparation, etc. Repeatable row height, simple and stable preparation method

Active Publication Date: 2014-08-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to TiO 2 The forbidden band width of TiO is relatively large, it is only active in the ultraviolet region, and ultraviolet light only accounts for 4% of the total energy of sunlight, which limits the TiO 2 Applications in the field of photocatalysis

Method used

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  • Alcohol photo-oxidization catalyst, and preparation method and application thereof
  • Alcohol photo-oxidization catalyst, and preparation method and application thereof
  • Alcohol photo-oxidization catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add 5 mL of toluene as the solvent, 50 μL of benzyl alcohol as the reaction substrate, and 40 μL of undecane as the internal standard into the airtight container. Add 30mg catalyst (the average aspect ratio of gold rod is 4.2, TiO 2 The average wall thickness of the shell is 40nm), stirring, passing through oxygen at a rate of 20mL / min, reacting under visible-near-infrared light irradiation and oxygen atmosphere for 16 hours, and taking a sample every 2 hours. The illuminated area is 6.25cm 2 .

[0042] Detection by gas chromatography, Shanghai Ruimin Instrument Co., Ltd., detector FID, column HP-5 capillary column.

[0043] Calibration of the chromatograms is required prior to calculation of yield. The calibration method is: mix 5mL toluene, 50μL benzyl alcohol, 30μL undecane, and 40μL benzaldehyde to make a standard solution. Take 1 μL of standard solution into the chromatogram. From this, the integrated area of ​​the peak that the standard solution responds to i...

Embodiment 2

[0054] The method of Example 1 was used for reaction, detection and data processing, the difference was only that the reaction was carried out under dark conditions.

Embodiment 3

[0056] The method of Example 1 was used for reaction, detection and data processing, the only difference being that the aspect ratio of the gold rod in the catalyst used was shortened to 2.4. The method is that in the process of synthesizing the catalyst, the reaction conditions for synthesizing the gold nanorod structure are changed: the amount of adding AgNO3 solution becomes 12mL, the amount of adding HCl solution becomes 12mL, and the amount of adding gold seed solution becomes 0.8mL .

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Abstract

The invention discloses an alcohol photo-oxidization catalyst, and a preparation method and application thereof. The catalyst is in a titanium dioxide-wrapped gold nanorod hollow shell-core structure. The method comprises the following steps of synthesizing a gold nanorod, wrapping the outer side of the gold nanorod with silicon dioxide, wrapping the silicon dioxide with a layer of unshaped titanium dioxide, wrapping the outermost layer with a layer of silicon dioxide, and performing calcination and sodium hydroxide aqueous solution etching to form the catalyst. The catalyst can be used for oxidizing an alcohol substance into an aldehyde substance in an oxygen atmosphere by virtue of visible light and even near infrared light, for example, the oxidization of benzyl alcohol into benzaldehyde, the amount of benzaldehyde generated under the existence of every gram of catalyst for 16 hours is maximally 685.7 micromole.

Description

technical field [0001] The invention relates to the technical field of photocatalytic production of aldehydes from alcohols, and more specifically, to an alcohol photooxidation catalyst and its preparation method and application. Background technique [0002] In recent years, due to the massive development and use of fossil energy, frequent energy crises and environmental crises have occurred, and people urgently need to develop new energy to replace fossil energy. As a clean and renewable energy source, solar energy is receiving widespread attention. Photocatalytic conversion of organic matter, photolysis of water, photodegradation of pollutants and other light-driven reactions have gradually become research hotspots in the past decade. This type of reaction can directly convert solar energy into chemical energy, which has good energy and environmental benefits. Among the many photocatalyst materials that have been studied, TiO 2 It is considered to be the most promising...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J35/00C07C47/54C07C45/38B82Y30/00B82Y40/00
Inventor 巩金龙李盎王拓张鹏常晓侠李长江蔡伟亭
Owner TIANJIN UNIV
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