Graphene loaded cerium catalyst and preparation method thereof

A graphene and catalyst technology, applied in the field of graphene-supported cerium catalyst and its preparation, can solve the problems of poor recycling effect, reduced catalytic efficiency, and loss, and achieve easy recovery and recycling, simple method operation, and high catalytic activity Effect

Inactive Publication Date: 2017-06-13
YANCHENG INST OF IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, although the most common cerium trichloride heptahydrate and sodium iodide have the characteristics of low cost, low toxicity and high catalytic activity, because this composite catalyst is easily soluble in water, the catalytic efficiency in the organic phase is reduced and it is easy to lose In the water phase of the reaction, the recycling effect is poor, and sodium iodide is easy to oxidize and decompose, which greatly affects the catalytic effect

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  • Graphene loaded cerium catalyst and preparation method thereof
  • Graphene loaded cerium catalyst and preparation method thereof
  • Graphene loaded cerium catalyst and preparation method thereof

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preparation example Construction

[0015] A kind of preparation method of graphene supported cerium catalyst that the embodiment of the present invention provides, it comprises the steps:

[0016] S1. Add the aqueous solution of cerium trichloride dropwise to the alcohol solution containing concentrated ammonia water, stir, and keep warm at a temperature of 40-60° C. for 1-1.5 hours to obtain a suspension of cerium oxide.

[0017] Specifically, the reaction principle is roughly that the cerium trichloride aqueous solution reacts with the alcohol solution containing concentrated ammonia water to form cerium hydroxide, which is unstable and decomposes into cerium oxide to form a cerium oxide suspension. The cerium trichloride aqueous solution is added dropwise to fully react the cerium trichloride aqueous solution with the alcohol solution of concentrated ammonia water, which improves the conversion rate of the reaction. The purpose of stirring is also to make the alcohol solution of cerium trichloride aqueous sol...

Embodiment 1

[0032] The present embodiment provides a kind of preparation method of graphene supported cerium catalyst, it comprises the following steps:

[0033] First, 0.20 g of anhydrous cerium trichloride was weighed and dissolved in 100 ml of deionized water, and fully dissolved to obtain a cerium trichloride solution. Add 50 ml of concentrated ammonia water-ethanol solution (1:1) dropwise to the above cerium trichloride solution, stir magnetically, and keep warm at 50° C. for 1 h to obtain a cerium oxide suspension.

[0034] Next, 1.20 g of graphene oxide was weighed, added to 50 ml of distilled water, and placed in an ultrasonic reactor with a power of 168 W for 2 hours to obtain a graphene oxide suspension.

[0035] Finally, after mixing the above-mentioned cerium oxide suspension and graphene oxide suspension, transfer them to a polytetrafluoroethylene-lined autoclave, react at 160°C for 8 hours to obtain a mixed solution, centrifuge the obtained mixed solution, and remove The su...

Embodiment 2

[0038] The present embodiment provides a kind of preparation method of graphene supported cerium catalyst, it comprises the following steps:

[0039] First, weigh 0.22 g of anhydrous cerium trichloride and dissolve it in 100 ml of deionized water to obtain a cerium trichloride solution after fully dissolving. Add 50 ml of concentrated ammonia water-ethanol solution (1:1) dropwise to the above cerium trichloride solution, stir magnetically, and keep warm at 50° C. for 1 h to obtain a cerium oxide suspension.

[0040] Next, 1.18 g of graphene oxide was weighed, added to 50 ml of distilled water, and placed in an ultrasonic reactor with a power of 168 W for 1.5 h to obtain a graphene oxide suspension.

[0041] Finally, after mixing the above cerium oxide suspension and graphene oxide suspension, transfer them to a polytetrafluoroethylene-lined autoclave, react at 168°C for 9 hours to obtain a mixed solution, centrifuge the obtained mixed solution, and remove The supernatant was ...

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Abstract

The invention discloses a graphene loaded cerium catalyst and a preparation method thereof, relating to the technical field of catalysts. The preparation method of the graphene loaded cerium catalyst comprises the following steps: mixing the prepared cerium oxide suspension and graphene oxide suspension, heating to 160-180 DEG C, and performing hydrothermal reaction for 6-10h; removing the supernatant to obtain solid sediment; and drying. The product obtained by the preparation method has perfect catalytic activity against heterocyclic organic compounds; and the method is easy to operate and suitable for industrial application. The graphene loaded cerium catalyst is prepared by the method and comprises active catalytic components, namely cerium dioxide and a graphene carrier and has fairly high catalytic activity in catalyzing heterocyclic organic compounds.

Description

technical field [0001] The invention relates to the technical field of catalysts, and in particular to a graphene-supported cerium catalyst and a preparation method thereof. Background technique [0002] The related reactions of constructing carbon-heterobonds are one of the most important research fields of organic synthesis nowadays, in which heterocyclic structures such as indoles, pyrroles, pyridines and imidazoles are widely found in natural medicines such as vitamins, antibiotics and organic bases, spices and dyes. middle. The number of compounds containing heterocyclic structures is huge, and they have outstanding chemical and biological activities. The traditional methods for constructing carbon-heterobonds (C-N, O, S, etc.) are mainly transition metal-catalyzed cross-coupling reactions of halogenated aromatic hydrocarbons, aromatic aldehydes, ketones, acids and nucleophiles containing heteroatoms. So far, the coupling reactions to construct bonds such as C-N, C-S,...

Claims

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Application Information

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IPC IPC(8): B01J23/10
CPCB01J23/10
Inventor 项东升
Owner YANCHENG INST OF IND TECH
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