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Aurum-copper bimetallic catalyst for oxidating CO at low temperature under rich hydrogen condition and preparation method thereof

A technology of bimetallic catalysts and conditions, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, non-metallic elements, etc., can solve the problems of unstable water and carbon dioxide, and high reaction temperature

Active Publication Date: 2013-04-17
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, non-precious metals also have the disadvantages of high reaction temperature and instability to water and carbon dioxide.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Take Ce(NO 3 ) 3 ·6H 2 O 6.7g was dissolved in 400ml deionized water, stirred evenly, recorded as a. Dissolve 20ml of ammonia water in 200ml of deionized water, stir well, record as b. Add the solution in a to b dropwise (dropping speed is 15ml / min), stir evenly, when the pH is 10 after the dropwise addition, continue to stir for 2h. Stand at room temperature for 20 hours, filter and wash with deionized water 4 times, each dosage 100ml, wash 4 times with 200ml of absolute ethanol, and dry at 110°C for 12 hours. In an air atmosphere, it was fired in a muffle furnace at 500 °C for 4 h with a heating rate of 10 °C / min. CeO 2 .

[0025] 2) Take 0.260 g of a copper nitrate solution containing 7.7% by mass of CuO and 1 g of chloroauric acid containing 0.48% by mass of Au and add it dropwise to 20 ml of deionized water, and stir evenly to obtain a gold-copper mixed solution.

[0026] 3) Weigh 2gCeO 2 , added to 150ml deionized water, then added 10ml0.5mol / L Na 2 CO...

Embodiment 2

[0029] 1) Take Ce(NO 3 ) 3 ·6H 2 O 6.7g g was dissolved in 400ml deionized water, stirred evenly, recorded as a. Dissolve 25ml of ammonia water in 200ml of deionized water, stir evenly, and record as b. The solution in a is added dropwise in b (the drop rate is 15ml / min), stir evenly, and when the dropwise addition is completed, the pH is 12 and the stirring is continued for 3h. Stand at room temperature for 20 hours, filter and wash with deionized water 5 times, each time 100ml, wash 3 times with 150ml of absolute ethanol, and dry at 120°C for 20 hours. In an air atmosphere, it was fired in a muffle furnace at 500°C for 4h with a heating rate of 2°C / min. CeO 2 .

[0030] 2) Take 0.650 g of copper nitrate solution containing 7.7% by mass of CuO and 0.5 g of chloroauric acid containing 0.48% by mass of Au and add them dropwise to 25 ml of deionized water, and stir evenly to obtain a gold-copper mixed solution.

[0031] 3) Weigh 2gCeO 2 Grind into fine powder, dissolve i...

Embodiment 3

[0034] 1) Take Ce(NO 3 ) 3 ·6H 2O 6.7g was dissolved in 400ml deionized water, stirred evenly, recorded as a. Dissolve 20ml of ammonia water in 200ml of deionized water, stir well, record as b. Add the solution in a to b dropwise (dropping speed is 15ml / min), stir evenly, when the pH is 13 after the dropwise addition, continue to stir for 1h. Stand at room temperature for 20 hours, filter and wash with deionized water 5 times, each time 100ml, wash 4 times with 200ml of absolute ethanol, and dry at 120°C for 12 hours. In the air atmosphere, use a muffle furnace to calcine in an air atmosphere at 400°C for 4h, and the heating rate is 8°C / min. CeO 2 .

[0035] 2) Take 0.650 g of a copper nitrate solution containing 7.7% by mass of CuO and 2 g of chloroauric acid containing 0.48% by mass of Au and add it dropwise to 25 ml of deionized water, and stir evenly to obtain a gold-copper mixed solution.

[0036] 3) Weigh 2gCeO 2 Grind it into a fine powder, dissolve it in 150ml ...

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PUM

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Abstract

The invention relates to an aurum-copper bimetallic catalyst for oxidating CO at low temperature under a rich hydrogen condition. The aurum-copper bimetallic catalyst is characterized in that: the catalyst consists of a CeO2 oxide carrier and an active component Au-Cu; the loading capacity of Au in the active component is 0.1 to 0.5 weight percent; the loading capacity of Cu is 1 to 4 weight percent; and the balance is the carrier. A preparation method for the aurum-copper bimetallic catalyst comprises the following steps: preparing a ceria carrier by a sol-gel method; and loading the active component on the carrier by a deposition-precipitation method. The prepared catalyst has the advantages that: the catalyst has high-efficient catalytic activity and can realize full removal of the CO in the rich hydrogen atmosphere within a temperature range of between 60 and 130 DEG C, the preparation condition is simple, the loading capacity of the Au is effectively reduced and the cost is reduced.

Description

technical field [0001] The invention belongs to a gold-copper bimetallic catalyst used for low-temperature oxidation of CO under hydrogen-rich conditions and a preparation method. Background technique [0002] Proton exchange membrane fuel cell PEMFC (proton exchange membrane fuel cell) has the following advantages: its power generation process does not involve hydrogen and oxygen combustion, so it is not limited by the Carnot cycle, and the energy conversion rate is high; it does not generate pollution when generating power, and the power generation unit is modularized. High reliability, convenient assembly and maintenance, and no noise during work. Therefore, PEMFC is a clean and efficient green power supply, which is very suitable as a power supply for next-generation vehicles. [0003] At present, the problem that PEMFC needs to solve urgently is the elimination of 0.5-1% CO in methanol reformed gas, because the maximum tolerance of Pt electrodes for fuel cells to CO do...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89C01B31/20B01D53/62C01B32/50
CPCY02A50/20
Inventor 王建国吴志伟朱华青秦张峰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI