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Near-infrared photothermal catalyst as well as preparation method and application thereof

A near-infrared light and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as short wavelength and high light intensity

Active Publication Date: 2021-10-26
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polyoxometalates (POM) are a class of early transition metal oxides MO x (x=5 or 6) composed of polyanion clusters, partial substitution of other transition metals makes POM have additional Lewis acidity, but still requires high temperature and high pressure. Although photocatalysis is a way to solve this problem, it often requires higher light intensity and shorter wavelength

Method used

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  • Near-infrared photothermal catalyst as well as preparation method and application thereof
  • Near-infrared photothermal catalyst as well as preparation method and application thereof
  • Near-infrared photothermal catalyst as well as preparation method and application thereof

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preparation example Construction

[0054] The invention provides a method for preparing a near-infrared photothermal catalyst, comprising the following steps;

[0055] Mixing the graphene oxide dispersion with a dehydrating agent to obtain a GO solution;

[0056] The GO solution and branched polyethyleneimine are mixed and then dried to obtain a GO-PEI carrier;

[0057] Mix the GO-PEI carrier with water and adjust the pH value to 2-4.5, add dropwise a mono-substituted Keggin-type POM aqueous solution, and carry out an ion replacement reaction to obtain the near-infrared photothermal catalyst, and the mono-substituted Keggin-type POM The solute in the POM aqueous solution is K 6 SiW 11 Co(H 2 O)O 39 or H 4 SiW 11 Ce(H 2 O) 4 o 39 .

[0058] In the present invention, the graphene oxide dispersion liquid is mixed with a dehydrating agent to obtain a GO solution.

[0059] In the present invention, the dehydrating agent is preferably 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride. In the pre...

Embodiment 1

[0087] Materials and Characterization

[0088] Materials and Reagents

[0089] GO was purchased from Jiangsu Xianfeng Nano Material Technology Co., Ltd.; PEI, Mw≈1800, was purchased from Anaiji Technology Co., Ltd. Dichloromethane (HPLC grade) was from Sigma-Aldrich. Epichlorohydrin (97%), propylene oxide (98%), 1,2-epoxycyclohexane (99%), styrene oxide (97%) and 2-(phenoxymethyl)epoxy Ethane (97%) was purchased from Aladdin Limited. Ultrapure water was used throughout the experiments. All chemicals were used without purification.

[0090] Instrument Characterization

[0091] Organic elemental analysis was performed on a Vario micro cube from Elementar. Fourier transform infrared (FT-IR) spectra were acquired on a Bruker Vertex 80V spectrometer equipped with a DTGS detector (32 scans) at a resolution of 4 cm -1 . Inductively coupled plasma (ICP) analysis was performed on OPTIMA3300DV (Perkin Elmer). Scanning electron microscopy (SEM) measurements were performed on a J...

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Abstract

The invention provides a near-infrared photothermal catalyst as well as a preparation method and application thereof, and belongs to the field of catalyst materials. According to the invention, a near infrared (NIR) photothermal effect is introduced into a composite catalyst, based on Lewis acidity and structure priority, cobalt and cerium mono-substituted Keggin type polyoxometalate (POM) is selected to be electrostatically bonded to a branched polyethyleneimine (PEI) covalently grafted graphene oxide (GO) carrier, and the NIR photothermal catalyst is formed. PEI is not only a connecting agent of GO and POM, but also a Lewis base so as to serve as an adsorbent of CO2, SiWCo and SiWCe serve as Lewis acid to catalyze cycloaddition reaction, the GO substrate not only integrates the adsorbent and a catalytic center to realize concerted catalysis, but also provides NIR photo-thermal for local heating, so that the catalyst accelerates the cycloaddition reaction of CO2 and epoxide at a very high conversion frequency under mild temperature and atmospheric conditions.

Description

technical field [0001] The invention relates to the technical field of preparation of catalyst materials, in particular to a near-infrared photothermal catalyst and its preparation method and application. Background technique [0002] CO caused by human activities 2 The ever-increasing emissions have brought serious environmental problems and threatened the living conditions of human beings. In order to reduce carbon emissions, one of the methods available in chemistry is to convert CO 2 Efficiently transform into high value-added products. Therefore, CO 2 It has become very popular as an inexpensive and abundant C1 resource for the production of various valuable chemicals. However, CO 2 The transformation of still needs to consume energy. Photocatalytic hydrogenation / photothermal hydrogenation and electrocatalytic hydrogenation have been proven to be very effective methods. A range of reduction products have been produced, such as carbon monoxide, bicarbonate, formam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/888B01J31/06B01J31/34B01J35/00C07D317/36C07D317/46
CPCB01J31/34B01J31/069B01J23/30B01J23/888C07D317/36C07D317/46B01J35/39B01J21/08B01J37/04B01J37/06B01J21/18B01J37/0236
Inventor 吴立新陈晓飞李豹
Owner JILIN UNIV