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Water-etched graphene confinement Pt nano composite material, preparation method and application thereof

A nano-composite material and graphene technology, applied in the field of butane dehydrogenation reaction catalysts, can solve problems such as difficult deactivation of the catalyst, and achieve the effects of mature production technology, good catalytic performance, and simple preparation method.

Active Publication Date: 2021-03-09
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although researchers have done a lot of research and improvement on butane dehydrogenation technology, since alkane dehydrogenation is a strong endothermic reaction, side reactions such as deep cracking and isomerization of alkanes occur at the same time as dehydrogenation on the surface of the catalyst. It is difficult for the catalyst to avoid coking reaction and lead to deactivation

Method used

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  • Water-etched graphene confinement Pt nano composite material, preparation method and application thereof
  • Water-etched graphene confinement Pt nano composite material, preparation method and application thereof
  • Water-etched graphene confinement Pt nano composite material, preparation method and application thereof

Examples

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Embodiment 1

[0029] Example 1 A water-etched graphene-confined Pt nanocomposite Pt / GO(H 2 O) Preparation

[0030] (1) The preparation method is as follows:

[0031] 1. Preparation of Pt / GO

[0032] Weigh 200mg of graphene, put it into 40mL of ethylene glycol solution, and ultrasonicate for 5-10min to make the graphene evenly dispersed. Then add 410.5 μL of chloroplatinic acid solution, adjust the pH of the mixture to 11.5, react at a constant temperature of 130°C for 3 hours, cool to room temperature after the reaction, adjust the pH of the mixture to 3.5, filter the precipitate and wash it with deionized water, and place it at 60- Dry overnight in an oven at 70°C to obtain a graphene-supported Pt nanoparticle composite material. The loading amount of Pt nanoparticles is 0.5% by weight, which is recorded as 0.5wt% Pt / GO.

[0033] 2. Preparation of Pt / GO(H 2 O)

[0034] 1) Put 50mg Pt / GO in the alumina crucible, put 0.5mL deionized water in the porcelain boat, put Pt / GO and deionized w...

Embodiment 2

[0039] Example 2 Pt / GO(H 2 O) application in catalytic butane dehydrogenation reaction

[0040] Methods as below:

[0041] 1) Pt / GO(H 2 O) in H 2 atmosphere, H 2 The flow rate is 30mL / min, and the in-situ reduction is performed at 200°C for 1h.

[0042] 2) In the reaction vessel, add 50 mg of Pt / GO(H 2 O) As a catalyst, it is carried out in a temperature-programmed mode at ambient pressure, and the heating rate is 10°C / min. With He as the balance gas, the gas reactant contains 2vol% n-C 4 h 10 and 2vol%H 2 , passed into the reaction vessel containing the catalyst at a flow rate of 25.5 mL / min, and under ambient pressure, the temperature was programmed to 450° C. to catalyze the dehydrogenation of butane to butene. As a comparison, Pt / GO was added as a catalyst in another reaction vessel, and the method was the same as above to catalyze the dehydrogenation of butane to butene.

[0043] 3) Detection, reactants and products were analyzed online by gas chromatography (Ag...

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Abstract

The invention discloses a preparation method and application of a water-etched graphene confinement Pt nano composite material, wherein the water-etched graphene confinement Pt nano composite materialis Pt / GO(H2O). The preparation method comprises the following steps: directly loading Pt nanoparticles onto graphene by utilizing a wet chemical reduction method to obtain Pt / GO; and then adopting aCVD method to enable vapor deposition to etch the surface layer of the graphene to prepare Pt / GO(H2O). According to the invention, the Pt / GO(H2O) prepared by the method shows good butane dehydrogenation catalytic performance; and more defects are caused to graphene through the etching effect of water to well stabilize the Pt nanoparticles, so that the Pt nanoparticles have higher conversion rate and selectivity in the selective dehydrogenation reaction of n-butane.

Description

technical field [0001] The invention belongs to the technical field of butane dehydrogenation reaction catalysts, and in particular relates to a water-etched graphene-confined Pt nanocomposite material, a preparation method thereof, and an application as a butane dehydrogenation reaction catalyst. Background technique [0002] As we all know, butene is an important petrochemical raw material next to ethylene and propylene. At present, butene is mainly used to produce chemical products such as tert-butanol, polyisobutylene, butyl rubber, and plexiglass. Due to the large demand for butene in the downstream market, especially the continuous expansion of the automobile manufacturing industry, the market demand for butene is increasing year by year. The research and application of butane dehydrogenation to butene technology can effectively alleviate the current situation of insufficient supply of butene, and has a good prospect for industrial application. In addition, the dehyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J23/42B01J35/00B01J37/10C07C5/333C07C11/08
CPCB01J21/18B01J23/42B01J37/10C07C5/3337B01J35/391B01J35/393C07C11/08
Inventor 杨黎妮曾浩马召彬夏立新
Owner LIAONING UNIVERSITY
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