Construction method and application of Pickering microbubble system for preparing methanol through photocatalytic reduction of CO2

A construction method, CO2 technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of poor selectivity of target products, low reduction efficiency, etc., to improve CO2 reduction efficiency and methanol conversion rate , Improve the reduction efficiency and solve the effect of contact difficulties

Active Publication Date: 2020-09-25
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the photocatalysis of CO in the aqueous solution system in the prior art 2 The problem of low reduction efficiency and poor selectivity of the target product, the present invention provides a photocatalytic reduction of CO 2 Construction method and application of Pickering microbubble system for preparing methanol

Method used

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  • Construction method and application of Pickering microbubble system for preparing methanol through photocatalytic reduction of CO2
  • Construction method and application of Pickering microbubble system for preparing methanol through photocatalytic reduction of CO2
  • Construction method and application of Pickering microbubble system for preparing methanol through photocatalytic reduction of CO2

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Embodiment 1

[0035] According to attached figure 1 The method shown to prepare the amphiphilic Pickering photocatalyst: the porous SiO 2 Surface hydroxylation of microspheres to obtain hydrophilic SiO 2 (see attached figure 2 , its gas / liquid / solid three-phase contact angle is 24 ° ), then regiomodified by hydrophobic aminosilicone esters to become amphiphilic SiO 2 carrier (see attached image 3 , its gas / liquid / solid three-phase contact angle is 93 ° ); the metal photocatalyst Pt was supported on the amphiphilic SiO by photoreduction method 2 carrier to obtain amphiphilic Pickering photocatalyst.

[0036] Construction of the Pickering microbubble system: Weigh 1.0 g of amphiphilic Pickering photocatalyst, add it to a closed light-transmitting reactor containing 30 mL of deionized water, and fill it with CO 2 Gas and maintain the system pressure at 0.1MPa, stir magnetically at 800rpm for 10min to form CO in water 2 Type Pickering microbubble system (see attached Figure 4 ). at...

Embodiment 2

[0038] Preparation of amphiphilic Pickering photocatalysts: Surface introduction of porous carbon materials-N + (CH 3 ) 3 Cl - The group is treated with hydrophilicity, and then adjusted with hydrophobic silane to obtain a gas / liquid / solid three-phase contact angle of 89 ° amphiphilic support; the TiO 2 The photocatalyst is loaded on the amphiphilic carrier to obtain the amphiphilic Pickering photocatalyst.

[0039] Construction of the Pickering microbubble system: Weigh 1.5g of amphiphilic Pickering photocatalyst, add it to a closed light-transmitting reactor containing 50mL of deionized water, and fill it with CO 2 Gas and maintain the system pressure at 0.2MPa, stir magnetically at 900rpm for 15min to form CO in water 2 Type Pickering microbubble system.

Embodiment 3

[0041] Preparation of amphiphilic Pickering photocatalyst: introduce -COOH and -OH groups on the surface of graphene for hydrophilic treatment, and then use hydrophobic silicone grease to control, and obtain a gas / liquid / solid three-phase contact angle of 89 ° amphiphilic carrier; protonated g-C by electrostatic self-assembly method 3 N 4 The photocatalyst is loaded on the amphiphilic carrier to obtain the amphiphilic Pickering photocatalyst.

[0042] Construction of the Pickering microbubble system: Weigh 1.8g of amphiphilic Pickering photocatalyst, add it to a closed light-transmitting reactor containing 60mL deionized water, and fill it with CO 2 Gas and maintain the system pressure at 0.25MPa, and magnetically stir at 1000rpm for 20min to form CO in water 2 Type Pickering microbubble system.

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Abstract

The invention belongs to the field of photocatalytic CO2 reduction, and particularly relates to a construction method and application of a Pickering microbubble system for preparing methanol through photocatalytic reduction of CO2. The Pickering microbubble system is a CO2-in-water microbubble system, which is formed by taking an amphiphilic Pickering solid photocatalyst as an emulsifying agent and spontaneously assembling the amphiphilic Pickering solid photocatalyst on a gas-water interface. When the system is used for photocatalytic CO2 reduction reaction, the reduction efficiency can be improved by 10-80% in comparison with that of the traditional gas-liquid two-phase reaction, and the selectivity of the reduction product methanol can be improved by 20-80%.

Description

technical field [0001] The invention belongs to photocatalytic CO 2 Reduction field, specifically related to a photocatalytic reduction of CO 2 The construction method and application of the Pickering microbubble system for the preparation of methanol. Background technique [0002] Atmospheric CO 2 The continuous growth of the concentration has led to a series of problems such as global warming and climate deterioration. How to effectively control CO 2 Emissions, to control them from the source, is the dream of human beings. Photocatalytic CO with "negative emission" effect 2 Reduction technology can not only effectively reduce CO in the atmosphere 2 content, and the abundant solar energy can also be used to convert CO 2 Converting to low-carbon new energy is of great significance to solving energy shortages and environmental problems. [0003] CO 2 It is a very stable oxide with a standard heat of formation of -394.38kJ mol -1 , high inertness, not easy to activat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J27/24B01J27/051B01J21/08C07C31/04C07C29/157C07C29/153B01J8/00
CPCB01J8/00B01J21/08B01J23/42B01J27/0515B01J27/24B01J35/004C07C29/153C07C29/157C07C31/04Y02P20/52
Inventor 杨恒权刘宪薛楠
Owner SHANXI UNIV
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