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A photocatalyst for highly selective oxidation of alcohols to aldehydes and its preparation and application

A photocatalyst and high-selectivity technology, applied in the field of photocatalyst and nano-photocatalyst, can solve the problems of unsatisfactory industrial application, low photocatalytic efficiency and product selectivity, and achieve high catalytic efficiency and product selectivity. Preparation method Ease of handling and improvement of photocatalytic efficiency

Active Publication Date: 2020-05-01
永州盛业有机科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the catalysts for photocatalytic selective oxidation of alcohols are nano-oxide semiconductors, and the photocatalytic efficiency and product selectivity are low, which cannot meet industrial applications.

Method used

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  • A photocatalyst for highly selective oxidation of alcohols to aldehydes and its preparation and application
  • A photocatalyst for highly selective oxidation of alcohols to aldehydes and its preparation and application
  • A photocatalyst for highly selective oxidation of alcohols to aldehydes and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of BiOCl ultrathin nanosheets supported nano-Pd photocatalyst (Pd-BiOCl):

[0038] a. Dissolve 0.6mmol mannitol and 0.4g polyvinylpyrrolidone (PVP, K-30) in 60mL distilled water, stir to dissolve;

[0039] b. Dissolve 2.0 mmol of bismuth nitrate pentahydrate and sodium chloride in 10 mL of ethylene glycol, respectively, and ultrasonically form solutions at room temperature;

[0040] c. Add the solution prepared in step b to the solution in step a successively (add the solution containing bismuth nitrate pentahydrate first, then add the solution containing sodium chloride after mixing), transfer to a volume of 50mL after mixing In a hydrothermal reaction kettle, seal it, keep it warm at 160°C for 8 hours, cool to room temperature after the reaction, and centrifuge the generated precipitate, wash with distilled water and dry to obtain BiOCl ultrathin nanosheets;

[0041] d. Weigh 10 mg of the BiOCl ultrathin nanosheets obtained in step c and ultrasonically di...

Embodiment 2

[0045] Photocatalytic Selective Oxidation of Benzyl Alcohol to Benzaldehyde

[0046] a. Weigh 1 mg of Pd-BiOCl photocatalyst and ultrasonically disperse it in 2 mL of acetonitrile to form a suspension;

[0047] b. Add 50 μmol of benzyl alcohol to the suspension in step a, and stir evenly;

[0048] c. Transfer the mixed solution obtained in step b to a quartz tube, and irradiate with a xenon lamp with an optical power density of 158mW / cm 2 ;

[0049] d. The reaction solution in step c is centrifuged to take the supernatant, which is detected and analyzed by gas chromatography.

[0050] As can be seen from Table 1, along with the prolongation of illumination time, the productive rate of benzaldehyde produced by photocatalytic selective oxidation of benzyl alcohol is getting higher and higher, after reacting for 8 hours, conversion rate is close to 100%; While conversion rate improves constantly, The product selectivity to form benzaldehyde is always above 90%.

Embodiment 3

[0052] Photocatalytic Selective Oxidation of p-Toluene Alcohol to p-Tolualdehyde

[0053] a. Weigh 1 mg of Pd-BiOCl photocatalyst and ultrasonically disperse it in 2 mL of acetonitrile to form a suspension;

[0054] b. Add 50 μmol p-methylbenzyl alcohol to the suspension in step a, and stir evenly;

[0055] c. Transfer the mixed solution obtained in step b to a quartz tube, and irradiate with a xenon lamp with an optical power density of 158mW / cm 2 ;

[0056] d. The reaction solution in step c is centrifuged to take the supernatant, which is detected and analyzed by gas chromatography.

[0057] As can be seen from accompanying table 2, after 8 hours of illumination, the conversion rate of photocatalytic selective oxidation of p-methylbenzyl alcohol to generate p-tolualdehyde exceeds 80%, and the photocatalytic selective oxidation of p-methylbenzyl alcohol generates The product selectivity to p-tolualdehyde was 100%.

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Abstract

The invention relates to the technical field of nanometer photocatalysts, in particular to a photocatalyst with a function of catalytically oxidizing alcohol to form aldehyde in a high-selectivity manner, and preparation and application of the photocatalyst. Palladium nanometer particles are uniformly loaded on the surfaces of bismuth oxychloride (BiOCl) ultrathin nanometer sheets to form the photocatalyst. The thicknesses of the BiOCl ultrathin nanometer sheets are 3-10 nm, the diameters of the BiOCl ultrathin nanometer sheets are 50-100 nm, the particle sizes of the palladium nanometer particles are 2-10 nm, and the mass fraction of the palladium nanometer particles in the photocatalyst is 1-3 wt%. The photocatalyst, the preparation and the application have the advantages that sunlight in full wave bands can be absorbed by the photocatalyst, separation of photo-induced carriers can be improved, the surface catalytic activity can be greatly improved, and the photocatalytic efficiencycan be comprehensively improved; the photocatalyst with the function of photocatalytically selectively oxidizing the alcohol to form the aldehyde is high in catalytic efficiency and product selectivity as compared with other types of photocatalysts.

Description

technical field [0001] The invention relates to the technical field of nanometer photocatalysts, in particular to a photocatalyst for highly selectively catalyzing the oxidation of alcohols into aldehydes and its preparation and application. Background technique [0002] Aldehydes are an important class of organic compounds and play a very important role in organic synthesis. It is widely used in the manufacturing industries of medicine, spices, pesticides, dyes and plastics, and with the development of the economy, the demand for benzaldehyde in my country is increasing, and the requirements for its quality are also increasing. In addition to the extraction of aldehydes from natural products, the production of aldehydes is mainly produced by the selective oxidation of alcohols in industry. [0003] Alcohol selective oxidation is widely used in large-scale chemical industrial production, and it is also an important content of fine chemical research. However, the catalytic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/13C07C45/29C07C47/54C07C47/575C07C47/542C07C47/232
CPCB01J27/13B01J35/004B01J35/006B01J35/0073B01J37/10B01J37/344C07C45/29C07C47/54C07C47/575C07C47/542C07C47/232Y02P20/584
Inventor 李本侠邵良志汪任山
Owner 永州盛业有机科技有限公司
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