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CuO-CeO2/MWCNT(Multi Walled Carbon Nanotubes) catalyst and preparation method thereof

A technology of catalysts and composite oxides, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxides/metal hydroxide catalysts, etc. Catalyst is expensive and other problems, to achieve the effect of simple preparation method, high activity and stability, and good repeatability

Inactive Publication Date: 2013-06-19
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Supported noble metal catalysts such as Pt, Ru, and Au have good activity for the preferential oxidation of CO [E.D.Park, D.Lee, H.C.Lee, Catal.Today139 (2009) 280], but the catalyst is expensive and has low selectivity for CO conversion. Poor, it is difficult to be widely used at present

Method used

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  • CuO-CeO2/MWCNT(Multi Walled Carbon Nanotubes) catalyst and preparation method thereof
  • CuO-CeO2/MWCNT(Multi Walled Carbon Nanotubes) catalyst and preparation method thereof
  • CuO-CeO2/MWCNT(Multi Walled Carbon Nanotubes) catalyst and preparation method thereof

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preparation example 1

[0039] Preparation Example 1: Preparation of CuO-CeO of the present invention 2 / MWCNT catalyst

[0040] Put 2 g of multi-walled carbon nanotubes of different diameters (produced by Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences) into a 250ml round bottom flask, add 37% to 65% of HNO 3 100ml, put it into an oil bath and reflux at 110-140°C for 5 hours, naturally cool to room temperature, filter and wash until pH=7, put it in an oven and dry at 110°C for 10 hours.

[0041] Weigh a certain amount of Cu(NO 3 ) 2 and Ce(NO 3 ) 3 Put into a 100ml beaker, add 30ml of acetone solvent and magnetically stir for 5 minutes, then weigh 0.3g of acid-pretreated carbon nanotubes and add them to the acetone solution (the metal oxide accounts for 20% of the total weight of the catalyst), and continue to stir for 5 minutes. Seal the mouth of the beaker with tin foil and put it into an ultrasonic machine for 3 hours of ultrasonication. The ultrasonic sample was stirred at ...

preparation example 2

[0042] Preparation example 2: prepare activated carbon (AC) and aluminum oxide (Al 2 o 3 ) supported CuO-CeO 2 catalyst

[0043] Weigh a certain amount of Cu(NO 3 ) 2 and Ce(NO 3 ) 3 Put it into a 100ml beaker, add 30ml of acetone magnet and stir for 5 minutes, then weigh 0.3g of activated carbon or alumina and add it to the acetone solution (the metal oxide accounts for 20% of the total weight of the catalyst), continue to stir for 5 minutes, cover the mouth of the beaker with tin foil Seal it and place it in an ultrasonic machine for 3 hours of ultrasonication. The ultrasonicated sample is stirred at room temperature until it is dry, then placed in a constant temperature blast drying oven at 110°C for 12 hours, cooled naturally to room temperature, placed in a mortar and ground, and then placed in a tube furnace in high-purity N 2 Calcined at 350°C for 2 hours in the atmosphere, the heating rate was 2°C / min, and the final catalysts were 20wt% (0.5)CuO-(0.5)CeO 2 -(35...

preparation example 3

[0044] Preparation Example 3: Preparation of Unsupported CuO-CeO 2 catalyst

[0045] Weigh a certain amount of Cu(NO 3 ) 2 and Ce(NO 3 ) 3 Put it into a 100ml beaker, add 30ml of acetone and stir for 5 minutes, seal the mouth of the beaker with tin foil and put it in an ultrasonic machine for 3 hours. After ultrasonication, stir the sample until dry at room temperature, and then put it in a constant temperature blast drying oven Dry at 110°C for 12 hours, cool to room temperature naturally, put it into a mortar and grind it finely, then put it into a tube furnace and calcinate at 350°C for 2 hours in a high-purity N2 atmosphere, the heating rate is 2°C / min, and finally the obtained The catalyst is unsupported (0.5)CuO-(0.5)CeO 2 -(350).

[0046] (2) Application Examples and Comparative Examples

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Abstract

The invention relates to a CuO-CeO2 / MWCNT(Multi Walled Carbon Nanotubes) catalyst which oxidizes CO in advance under a hydrogen enriching condition. A conventional CuO-CeO2 compound oxidant is carried on a multi walled carbon nanotube. The catalyst is simple in synthetic method and good in repeatability, and can be prepared in batches. The catalyst has good activity and selectivity, and is high in utilization to oxidants. Compared with conventional CuO-CeO2 catalysts, proportion of copper and cerium is largely changed. Compared with catalysts loaded by aluminum oxide, active carbon, a molecular sieve and the like, the catalyst loaded by the carbon nanotube is higher in activity and selectivity, and meanwhile, the pipe diameter of the carbon nanotube affects the catalytic activity greatly. The catalyst has a wide application prospect in treatment of hydrogen enriching fuel gases of fuel cells, and is an ideal material for replacing a metal catalyst.

Description

technical field [0001] The present invention relates to a kind of catalyst and preparation method thereof, more specifically relate to a kind of CuO-CeO used for the preferential oxidation of CO under hydrogen-rich conditions 2 Composite oxide catalyst and its preparation method. Background technique [0002] Fuel cell is a new type of energy conversion device with high working efficiency and environmental friendliness, which can directly convert the chemical energy of fuel into electrical energy. It is considered to be the fourth generation power generation device after hydraulic power, thermal power and nuclear power and a power device to replace internal combustion engines. . Proton exchange membrane fuel cell (PEMFC) is more and more popular due to its advantages of high energy density, long working life, fast response speed and low operating temperature. [0003] The fuel of proton exchange membrane fuel cells is generally hydrogen, which is mainly prepared industrial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83
Inventor 汪文栋高玉仙黄伟新
Owner UNIV OF SCI & TECH OF CHINA
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