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A kind of near-infrared photothermal catalyst and its preparation method and application

A near-infrared light and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve problems such as short wavelength and high light intensity

Active Publication Date: 2022-05-27
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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  • A kind of near-infrared photothermal catalyst and its preparation method and application
  • A kind of near-infrared photothermal catalyst and its preparation method and application
  • A kind of near-infrared photothermal catalyst and its preparation method and application

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preparation example Construction

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

[0055] Mixing graphene oxide dispersion and dehydrating agent to obtain GO solution;

[0056] Mixing the GO solution and branched polyethyleneimine and drying to obtain a GO-PEI carrier;

[0057] After mixing the GO-PEI carrier with water, the pH value is adjusted to 2-4.5, and the mono-substituted Keggin-type POM aqueous solution is added dropwise to carry out ion replacement reaction to obtain the near-infrared photothermal catalyst, the mono-substituted Keggin-type POM The solute of POM water 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 and the dehydrating agent are mixed to obtain the GO solution.

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

Embodiment 1

[0087] Materials and Characterization

[0088] Materials and Reagents

[0089] GO was purchased from Jiangsu Xianfeng Nanomaterials 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 experiment. All chemicals were not purified prior to use.

[0090] Instrument Characterization

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

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Abstract

The invention provides a near-infrared photothermal catalyst and its preparation method and application, which belong to the field of catalyst materials. The present invention introduces the near-infrared (NIR) photothermal effect into the composite catalyst, and based on Lewis acidity and structural preference, selects cobalt and cerium monosubstituted Keggin-type polyoxymetallic clusters (POM) to electrostatically bond to branched polyethyleneimine (PEI ) covalently grafted onto graphene oxide (GO) supports to form NIR photothermal catalysts. PEI is both a linker between GO and POM and a Lewis base, thus acting as a CO 2 , while SiWCo and SiWCe act as Lewis acid-catalyzed cycloaddition reactions, the GO matrix not only integrates the sorbent and catalytic centers for synergistic catalysis, but also provides NIR photothermal for local heating, making the catalyst work at a mild Acceleration of CO at very high conversion frequency under temperature and atmospheric conditions 2 Cycloaddition reactions with epoxides.

Description

technical field [0001] The invention relates to the technical field of catalyst material preparation, in particular to a near-infrared photothermal catalyst and a preparation method and application thereof. Background technique [0002] CO caused by human activities 2 Emissions are constantly increasing, creating serious environmental problems and threatening human living conditions. In order to reduce carbon emissions, one of the methods that can be used in chemistry is to convert CO 2 Efficient conversion 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 conversion still requires energy consumption. Photocatalytic hydrogenation / photothermal hydrogenation and electrocatalytic hydrogenation have been shown to be very effective methods. A range of reduction products, such as carbon monoxide, bicarbonate, formamide, methanol, and even m...

Claims

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Application Information

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Patent Type & Authority Patents(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