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Method for preparing methanol through photocatalytic oxidation of methane

A photocatalytic oxidation and photocatalyst technology, applied in the field of photocatalysis, can solve the problems of low selectivity and easy oxidation to HCHO

Pending Publication Date: 2020-06-26
GUANGZHOU UNIVERSITY
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Problems solved by technology

[0006] i.e. CH 4 O first 2 Oxidation to methyl hydroperoxide (CH 3 OOH), and then reduced to CH 3 OH, and the generated CH 3 OH is easily oxidized to HCHO under the input of high-energy light, resulting in the target product CH 3 OH selectivity is low

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  • Method for preparing methanol through photocatalytic oxidation of methane
  • Method for preparing methanol through photocatalytic oxidation of methane
  • Method for preparing methanol through photocatalytic oxidation of methane

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Embodiment 1

[0034] 1) Catalyst preparation Precursor: ZnO, sodium borohydride, barium sulfate, sodium sulfate, chloroauric acid, 5,5-dimethyl-1-pyrrole-n-oxide (DMPO). All chemicals were used without further purification.

[0035] 2) Preparation of Au / ZnO composite photocatalyst: Au / ZnO composite photocatalyst was prepared by chemical reduction method. Commercial ZnO nanoparticles (Aladdin, 200mg) were dispersed in 50mL deionized water and ultrasonically oscillated for 0.5h. Stir at room temperature for 6h, add a certain volume of 50mM HAuCl 4 , then NaBH was added dropwise in an ice bath 4 Perform chemical reduction. The synthesized substrate was washed three times with deionized water by centrifugation, and the moisture in the substrate was removed by vacuum evaporation. In order to improve its crystallinity, the composite material was calcined at 500℃ for 1h to prepare Au / ZnO composite photocatalyst.

[0036] 3) Photocatalytic CH 4 Aerobic oxidation reaction method: CH 4 Photoca...

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Abstract

The invention belongs to the field of photocatalysis, and discloses a method for preparing methanol through photocatalytic oxidation of methane. The method comprises the following steps: adding an Au / ZnO composite photocatalyst into water, performing stirring, introducing CH4 and O2, and carrying out photocatalytic CH4 oxidation reaction under a light irradiation condition to obtain methanol; wherein the loading capacity of Au in the photocatalyst is greater than or equal to 0.3wt%, and the pressure of CH4 is greater than or equal to 15bar. According to the preparation method, Au-loaded ZnO isused as the photocatalyst, conduction band electrons in ZnO are fully guided out through accurate regulation and control of Au nanoparticle loading capacity, and reduction of CH3OOH is promoted to prepare CH3OH. Besides, by replacing a light source, irradiation of an ultraviolet region is replaced with full-spectrum irradiation, so that the energy requirement in the reaction can be met, and generated CH3OH is prevented from being decomposed and oxidized into HCHO due to too high light energy input. Finally, CH4 is selectively oxidized to generate CH3OH, and the selectivity reaches 100%.

Description

technical field [0001] The invention belongs to the field of photocatalysis, and in particular relates to a method for preparing methanol by photocatalytically oxidizing methane. Background technique [0002] CH 4 It accounts for about 70% to 90% in nature, and has been widely regarded as an indispensable raw material in the industrial preparation process. Especially CH 4 Capable of selective oxidation to valuable C1 organic products such as CH 3 OH and HCHO, this pattern has drawn particular attention from researchers. However, CH 4 The selective oxidation of CH has been facing two challenges: one is CH 4 It is a non-polar molecular structure with high C-H bond energy (345kJ mol -1 ), making it difficult for chemical reactions to occur; the second is the ideal product CH 3 OH and HCHO have low thermodynamic stability and are easily deeply oxidized to CO 2 . Industrial CH 4 The dominant method of conversion into valuable products is the indirect steam reforming tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/50C07C31/04B01J23/66
CPCC07C29/50B01J23/66B01J35/39C07C31/04Y02P20/52
Inventor 牛利韩冬雪范英英魏世蕾
Owner GUANGZHOU UNIVERSITY