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Size-controllable palladium-cuprous oxide nano catalyst as well as preparation method and catalysis application of catalyst

A nano-catalyst and cuprous oxide technology, applied in the field of nano-materials, can solve problems such as complex experimental process, and achieve the effects of good repeatability, good application prospects and low price

Active Publication Date: 2014-08-13
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, catalysts such as nickel, palladium, and platinum are widely used in the hydrogenation of acetylene, and they are all fixed on metal oxide supports. However, most of these catalysts are prepared by impregnation, and the experimental process is relatively complicated.

Method used

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  • Size-controllable palladium-cuprous oxide nano catalyst as well as preparation method and catalysis application of catalyst
  • Size-controllable palladium-cuprous oxide nano catalyst as well as preparation method and catalysis application of catalyst
  • Size-controllable palladium-cuprous oxide nano catalyst as well as preparation method and catalysis application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of Cuprous Oxide Nanocrystals

[0033] Take 0.085g of copper chloride dihydrate, dissolve it in 50mL of ultrapure water, keep it in a constant temperature water bath at 55°C for half an hour, and keep stirring, then slowly add 5mL of sodium hydroxide solution with a concentration of 2mol / L dropwise, and keep it at a constant temperature for half an hour. Hours, continue to slowly drop 5 mL of ascorbic acid solution with a concentration of 0.6 mol / L, and react for 5 hours. After the reaction, the obtained product was centrifuged, washed repeatedly with ethanol and ultrapure water to obtain a reddish-brown cuprous oxide solid powder, and dried in a vacuum at room temperature for 12 hours to obtain a cuprous oxide nanocrystalline powder.

[0034] The above method for preparing cuprous oxide refers to the method provided by Zhang Dongfeng et al. (Delicate control of crystallographic facet-oriented Cu2O nanocrystals and the correlated adsorption ability. J. Mater...

Embodiment 2

[0036] With the mass fraction of 0.01% Pd as the carrier, the size of the obtained product and the selective hydrogenation activity of acetylene

[0037] Put 10-200mg of cuprous oxide synthesized by liquid phase reduction into a glass container, add absolute ethanol and ultrapure water, and add Pd / Cu under stirring conditions 2 O mass ratio of 0.01% PdCl 2Solution, after adding the solution, continue to stir for another half an hour, then carry out high-speed centrifugation to the obtained solution, and dry in a vacuum drying oven (without setting the temperature). Due to the low percentage of palladium loaded, in the transmission electron microscope ( figure 1 ) and no apparent particles about the palladium species.

[0038] The relevant catalytic performance test is done to the product obtained in the present embodiment below:

[0039] The selective hydrogenation reaction of acetylene is carried out in a quartz reaction tube. 20-200 mg of catalyst is added to the quartz r...

Embodiment 3

[0041] With the mass fraction of 0.05% Pd as the carrier, the size of the obtained product and the selective hydrogenation activity of acetylene

[0042] Put 10-200mg of cuprous oxide synthesized by liquid phase reduction into a glass container, add absolute ethanol and ultrapure water, and add Pd / Cu under stirring conditions 2 O mass ratio of 0.05% PdCl 2 Solution, after adding the solution, continue to stir for another half an hour, then carry out high-speed centrifugation to the obtained solution, and dry in a vacuum drying oven (without setting the temperature). Due to the low percentage of palladium loaded, in the transmission electron microscope ( figure 2 ) and no apparent particles about the palladium species.

[0043] The relevant catalytic performance test is done to the product obtained in the present embodiment below:

[0044] The selective hydrogenation reaction of acetylene is carried out in a quartz reaction tube. 20-200 mg of catalyst is added to the quartz...

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Abstract

The invention relates to a size-controllable palladium-cuprous oxide nano-catalyst, a preparation method of the catalyst, and catalysis application in preparation of ethylene through acetylene selective hydrogenation. The preparation method comprises the following steps: putting cuprous oxide nanocrystalline in a glass container, dropwise adding a palladium precursor solution with a weight ratio of Pd / Cu2O of 0.001-10 percent, continuously stirring, and continuously stirring for half a hour after the solution is ended; and centrifugally separating an obtained product, washing with absolute ethyl alcohol and ultrapure water for multiple times, and finally drying in vacuum. The size controllable palladium-cuprous oxide nano-catalyst shows excellent activity, selectivity and stability in catalytic reaction of the preparation of the ethylene through the selective hydrogenation of the acetylene. The preparation method disclosed by the invention is simple and convenient, and is free from harmful and side products. By controlling the sizes of palladium nano particles loaded in the cuprous oxide, the selectivity of reaction products in the selective hydrogenation of the acetylene can be controlled, and the reaction conversion rate is increased.

Description

technical field [0001] The invention belongs to the field of nanomaterials, and in particular relates to a nanomaterial and a preparation method thereof, in particular to a palladium-cuprous oxide nanocatalyst with a size-dependent effect and a preparation method thereof. A size-controllable palladium-cuprous oxide nanocatalyst for hydrogen reaction and a preparation method thereof. Background technique [0002] Palladium is a new type of environmentally friendly noble metal material, which has high catalytic activity and comprehensive excellent properties such as high temperature resistance, oxidation resistance, and corrosion resistance. It has become the most important catalyst material and is currently widely used. The vast majority of heterogeneous catalysts are supported by noble metals, such as Pd / A1 2 o 3 , Pd / C, Pd / CeO 2 Wait. Due to its high catalytic activity and selectivity, palladium catalyst plays an extremely important role in petroleum, chemical industry,...

Claims

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Application Information

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IPC IPC(8): B01J23/89C07C11/04C07C5/09
CPCY02P20/52
Inventor 黄伟新曹天
Owner UNIV OF SCI & TECH OF CHINA
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