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Carbon nanotubes-supported nitrogen doped graphene-coated platinum nanometer compound material and preparation method and application thereof

A technology of nitrogen-doped graphene and carbon nanotubes, which is applied in chemical instruments and methods, hydrogenation to hydrocarbons, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low styrene selectivity and complicated preparation methods , low conversion rate and other problems, to achieve the effect of simple preparation method, low cost and high conversion rate

Inactive Publication Date: 2018-12-21
LIAONING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing carbon-coated metal core catalysts have the following problems: the preparation method is complicated, the conversion rate of catalyzed phenylacetylene hydrogenation is low, the selectivity of styrene is low, and the cost is high.

Method used

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  • Carbon nanotubes-supported nitrogen doped graphene-coated platinum nanometer compound material and preparation method and application thereof
  • Carbon nanotubes-supported nitrogen doped graphene-coated platinum nanometer compound material and preparation method and application thereof
  • Carbon nanotubes-supported nitrogen doped graphene-coated platinum nanometer compound material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1 CN@Pt / CNTs of carbon nanotube-supported nitrogen-doped graphene-coated platinum nanocomposites

[0029] (1) The preparation method is as follows:

[0030] 1. Preparation of Pt / CNTs

[0031] 1) Mix 1500 mg of carbon nanotubes and 150 mL of concentrated nitric acid, heat to reflux at 120° C. for 12 hours, filter, and wash until neutral to obtain acidified carbon nanotubes.

[0032] 2) Weigh 200 mg of acidified carbon nanotubes, put them into 40 mL of ethylene glycol solution, and sonicate for 3-10 minutes, so that the carbon nanotubes are evenly dispersed. Then add 1.325mL chloroplatinic acid solution, adjust the pH of the mixed solution to 11-14, react at a constant temperature of 130°C for 3h, cool to room temperature after the reaction, adjust the pH of the mixed solution to 3-5, wash with deionized water, and place Dry overnight in an oven at 60-70°C to obtain a platinum nanoparticle composite material supported by carbon nanotubes, which is denoted as Pt / ...

Embodiment 2

[0042] Example 2 Application of Pt / CNTs, C@Pt / CNTs and CN@Pt / CNTs

[0043] 1. Method: Add 10mg of Pt / CNTs, C@Pt / CNTs and CN@Pt / CNTs to 200μL of ethanol solution of phenylacetylene and n-octane (200μL of n-octane as internal standard dissolved in 10mL of ethanol), Then put them together into a high-pressure reactor, exchange the air in the reactor with 0.04MPa argon for several times, then raise the temperature to 50°C, feed in 0.3MPa hydrogen, and react at 50°C for 20min to 120min. The conversion rate of phenylacetylene and the selectivity of styrene were detected by gas chromatography.

[0044] Depend on Figure 4a It can be seen that, using Pt / CNTs as a catalyst, with the increase of reaction time, the conversion rate increases gradually, and after the conversion rate reaches 100%, the selectivity gradually decreases. When the reaction time is 100 minutes, the conversion rate of phenylacetylene is 100%, and the conversion rate of benzene The selectivity to ethylene was 17....

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Abstract

The invention discloses a carbon nanotubes-supported nitrogen doped graphene-covering platinum nanometer compound material and a preparation method and application thereof, and belongs to the technical field of phenylacetylene selective hydrogenation reaction catalysts. A wet chemical reduction method is adopted for directly loading platinum nanoparticles onto carbon nanotubes subjected to acid treatment, a CVD method is used, nitrogen-doped graphene layers coat the surfaces of the platinum nanoparticles, and the number of the nitrogen-doped graphene layers is 2-7. Through the CVD method, thecarbon nanotubes-supported nitrogen doped graphene-coated platinum nanometer compound material is prepared, compared with traditional carbon nanotubes-supported Pt catalysts, a carbon nanotubes-supported nitrogen doped graphene-coated platinum nanoparticle catalyst can effectively catalyze conversion of phenylacetylene into styrene, and the hydrogenation selectivity and a conversion rate of the phenylacetylene are obviously improved; in the reaction process, inactivation is not prone to happen, and the cycling stability is good, wherein the carbon nanotubes-supported nitrogen doped graphene-covering platinum nanoparticle catalyst can be recycled for 4-5 times.

Description

technical field [0001] The invention relates to the technical field of phenylacetylene hydrogenation reaction catalysts, in particular to the application of a carbon nanotube-supported nitrogen-doped graphene-coated platinum nanoparticle composite material as a phenylacetylene hydrogenation reaction catalyst. Background technique [0002] Styrene (C 8 h 8 ) is the simplest member of unsaturated aromatic hydrocarbons. As an important basic organic chemical raw material in the downstream products of petroleum, it is widely used and is an important basic organic chemical raw material. However, styrene raw materials usually contain a small amount of alkyne compounds. The presence of alkyne compounds not only affects the construction of polymer chains and the polymerization rate during free radical polymerization, but also consumes an equivalent stoichiometric amount of catalyst. Therefore, the selective hydrogenation of alkynes to olefins is of great significance in the produ...

Claims

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Application Information

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IPC IPC(8): B01J23/42C07C15/46C07C5/09
CPCB01J23/42C07C5/09C07C15/46Y02P20/584
Inventor 杨黎妮李丹刘洪阳夏立新
Owner LIAONING UNIVERSITY
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