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Preparation method and application of high-activity Au/nano carbon catalyst for preparing benzaldehyde through oxidation of benzyl alcohol

A technology of benzyl alcohol and catalyst, which is applied in the preparation and application field of high-activity Au/nano-carbon catalyst for the oxidation of benzyl alcohol to benzaldehyde, can solve the problems of high reaction temperature, inconformity with energy saving and environmental protection, and achieve high selectivity of benzaldehyde Effect

Inactive Publication Date: 2019-05-10
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction temperature in the catalytic process is high (220-400°C), which does not meet the requirements of energy saving and environmental protection

Method used

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  • Preparation method and application of high-activity Au/nano carbon catalyst for preparing benzaldehyde through oxidation of benzyl alcohol
  • Preparation method and application of high-activity Au/nano carbon catalyst for preparing benzaldehyde through oxidation of benzyl alcohol
  • Preparation method and application of high-activity Au/nano carbon catalyst for preparing benzaldehyde through oxidation of benzyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 Sol anchor method prepares Au / OCNT catalyst

[0025] Take 76mL molar concentration as 10 -3 mol / L chloroauric acid aqueous solution, under stirring, add 7.5mL of polyvinyl alcohol aqueous solution with a mass fraction of 1wt% (the mass ratio of polyvinyl alcohol / Au is 5:1), and after stirring for 20min, add 3.8mL with a molar concentration of 0.1 mol / L sodium borohydride solution, after stirring for 10 minutes, add 1.0 g of oxygen-doped carbon nanotube (OCNT) carrier, continue stirring for 16 hours, filter, wash and dry the powder in a tube furnace at 300 ° C for 3 hours, Au catalyst supported by OCNT was obtained. figure 1 is a transmission electron microscope image of the Au / OCNT catalyst.

Embodiment 2

[0026] The preparation of embodiment 2 oxygen-doped carbon nanotubes (OCNT) carrier

[0027] Take 5g of carbon nanotube powder (Shandong Dazhan Nanomaterials Co., Ltd.), wash with 200mL of 37% hydrochloric acid solution for 12h, filter and wash until the filtrate is neutral, and dry to obtain acid-washed carbon nanotubes. Ozone generator is used to functionalize carbon nanotubes with ozone / air mixed gas. The pump speed is 16L / min. The mixed gas passes through and carries water vapor with a temperature of 30°C, and enters a vertical reactor with a constant temperature of 40°C. , the functionalization was continued for 50 min, and oxygen-doped carbon nanotubes OCNT were obtained.

Embodiment 3

[0028] Example 3 Preparation of Oxygen and Nitrogen Doped Carbon Nanotubes (O-NCNT) Support

[0029] Nitrogen-doped carbon nanotubes (NCNTs) were prepared by chemical vapor deposition using imidazole as a nitrogen and carbon source. The carbon nanotubes were functionalized with an ozone / air mixture using an ozone generator. The pumping speed was 16L / min, ozone production rate 5g / h, the mixed gas passes through and carries water vapor at a temperature of 30°C, enters a vertical reactor with a constant temperature of 40°C, and continues to functionalize for 50min to obtain oxygen and nitrogen dual element doped nano-carbon tube (O-NCNT). figure 2 TEM image of O-NCNT catalyst.

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Abstract

The invention discloses a preparation method and application of a high-activity Au / nano carbon catalyst for preparing benzaldehyde through oxidation of benzyl alcohol. A nano carbon material is dopedby one or more elements including O, N, S and P, one or more of nano carbon materials including carbon nanotubes, nano carbon fibers, nano diamond, activated carbon, graphene and the like are mixed asa carrier, and a sol anchoring method is adopted to load gold nanoparticles with the mass fraction of 0.5-5.0wt%. According to the Au / nano carbon catalyst provided by the invention, the benzaldehydeis prepared by efficiently and catalytically converting the benzyl alcohol through oxygen or air continuous reaction under normal pressure and at lower temperature. According to the method of the invention, in some embodiments, the benzyl alcohol conversion rate can reach 88.6% and the benzaldehyde selectivity can reach 99.0% or above depending on the set reaction parameters.

Description

technical field [0001] The invention relates to a preparation method and application of a high-activity Au / nano-carbon catalyst for the oxidation of benzyl alcohol to benzaldehyde. The nano-carbon material is doped with one or more elements of O, N, S, and P, and is anchored by a sol The loading mass fraction is 0.5-5.0wt% gold nanoparticles. Through continuous reaction under oxygen or air conditions, benzyl alcohol is effectively catalytically converted to produce benzyl alcohol at normal pressure and lower temperature. Background technique [0002] Supported gold nanomaterials are favored by researchers because of their excellent catalytic activity and high selectivity of target products in heterogeneous catalytic reactions. Compared with gold catalysts supported on active supports, inert supports (including SiO 2 、Al 2 o 3 , carbon nanomaterials, etc.) is difficult to form a strong gold-carrier interaction with gold, which generally leads to problems such as large siz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52C07C45/29C07C47/54
Inventor 梁长海董亚南罗靖洁
Owner DALIAN UNIV OF TECH