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Photocatalyst for preparation of hydrogen and corresponding aldehyde and ketone by means of alcohol decomposition

A photocatalyst and alcohol decomposition technology, which is applied in the direction of physical/chemical process catalyst, dehydrogenation preparation, carbon-based compound preparation, etc., can solve the problems of low reaction selectivity, poor product selectivity, over-oxidation, etc., and achieve high purity and easy Recycling, low cost effect

Active Publication Date: 2016-08-17
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxidative dehydrogenation refers to the use of oxidants to oxidize alcohols to produce compounds such as aldehydes and ketones. The problem with this method is that the oxidized product aldehyde is more likely to be oxidized, resulting in excessive oxidation and low reaction selectivity.
The currently disclosed photocatalytic alcohol hydrogen production method (CN1068546A) is often carried out in a water-alcohol mixed system, and the main problem is that the selectivity of the product is poor and the separation is difficult

Method used

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  • Photocatalyst for preparation of hydrogen and corresponding aldehyde and ketone by means of alcohol decomposition
  • Photocatalyst for preparation of hydrogen and corresponding aldehyde and ketone by means of alcohol decomposition
  • Photocatalyst for preparation of hydrogen and corresponding aldehyde and ketone by means of alcohol decomposition

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) 7 mg of cadmium sulfide is mixed with 5 mg of nickel chloride hexahydrate in methanol;

[0024] 2) Deoxygenate the system, and then irradiate with visible light (wavelength 420-800 nanometers) for 1 hour in an argon atmosphere under stirring to obtain a catalyst;

[0025] 3) Remove the supernatant, wash the catalyst with methanol, and dry it in vacuum at room temperature;

[0026] 4) Add 5 ml of methanol as a raw material, illuminate with a 300-watt xenon lamp for 24 hours, and generate 27 ml of hydrogen gas.

[0027] CH 3 OH=HCHO+H 2

[0028] The change of hydrogen production volume with the light time is as follows: image 3 As shown, it can be seen that the amount of hydrogen gas produced increases with the increase of illumination time. The amount of formaldehyde in the solution after the reaction was analyzed by gas chromatography, and the molar ratio of the amount of hydrogen obtained to the amount of formaldehyde was 1.0, indicating that the reaction was ...

Embodiment 2

[0030] Press the condition of embodiment 1, change raw material into 5 milliliters of ethanol, the amount of catalyst is the same as embodiment 1, illuminate 24 hours, produce 38 milliliters of hydrogen, the mol ratio of the amount of hydrogen obtained and the amount of acetaldehyde is 1.0.

Embodiment 3

[0032] Press the condition of embodiment 1, change raw material into 5 milliliters of isopropanols, the amount of catalyst is the same as embodiment 1, light 24 hours, produce 165 milliliters of hydrogen, the mol ratio of the amount of hydrogen obtained and the amount of acetone is 1.0. Figure 4 It is the relationship diagram of the hydrogen production volume changing with the illumination time during long-term continuous irradiation in this embodiment. It can be seen from the figure that the photocatalyst can continuously produce hydrogen within 121 hours, indicating that the catalyst has good stability.

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Abstract

The invention discloses a photocatalyst for preparation of hydrogen and corresponding aldehyde and ketone by means of alcohol decomposition. The photocatalyst comprises a semiconductor photocatalyst and nickel-based nanoparticles loaded on the surface of the semiconductor photocatalyst, wherein the nickel-based nanoparticles are nanoparticles containing one or more of metal nickel, nickel oxide and nickel chloride. The photocatalyst can decompose alcohol into the hydrogen and corresponding aldehyde and ketone at room temperature and normal pressure by means of sunlight, and the apparent quantum yield of the reaction reaches 40%. In addition, the photocatalyst is free of noble metal, low in cost and easy to recycle, the reaction can be conducted under the solvent-free condition, and the generated hydrogen is high in purity and can be used for proton exchange membrane fuel cells.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation, and relates to a photocatalyst capable of decomposing alcohol into hydrogen and corresponding aldehydes or ketones under light and a preparation method thereof. Background technique [0002] Simple alcohols, such as methanol and ethanol, are liquid at room temperature and can be derived from biomass and chemical production. Dehydrogenation of alcohols can produce hydrogen and corresponding aldehydes or ketones, so alcohols are considered as a potential hydrogen production and storage material. Hydrogen energy is a clean and renewable energy. In addition, aldehydes and ketones are important raw materials in organic synthesis. The reaction of dehydrogenation of alcohols to prepare corresponding aldehydes or ketones has important application value in the chemical industry. At present, the aldehydes and ketones corresponding to the preparation of alcohols are mainly realized throug...

Claims

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Application Information

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IPC IPC(8): B01J27/138C01B3/22C07C47/04C07C45/00C07C49/78C07C49/08C07C49/11
CPCC01B3/22C07C45/002B01J27/138C01B2203/1041C01B2203/1058C01B2203/1217C01B2203/06C01B2203/0277B01J35/39C07C47/04C07C49/78C07C49/08C07C49/11
Inventor 徐东升柴志刚李琦
Owner PEKING UNIV
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