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Catalyst for selective oxidation of CO in hydrogen enriched gas and preparation method thereof

An oxidation catalyst, selective technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the large gap between gas and reformed gas, unreported catalysts Catalytic performance, catalyst CO conversion rate and selectivity are low, to achieve the effect of low price

Inactive Publication Date: 2009-04-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent WO0160738 A2 (August 23, 2001) provides a series of Cu x Ce 1-x o 2-y Catalyst (x=0.01~0.3, y≥x, x and y are both molar ratios), but this catalyst cannot reduce the CO in the simulated gas containing 1vol% CO to below 100ppm, and did not study the presence of water vapor Catalyst Performance in Actual Reformed Gas
In Applied Catalysis A: (General) 232 (2002), 107-120, the author used the impregnation method to prepare CuO / CeO doped with samarium oxide 2 Catalyst, the gas ratio is H 2 :O 2 :CO=97:2:1 shows better CO catalytic performance, because the experimental gas and reformed gas are very different, it can not reflect the actual working conditions of the fuel cell
CuO-CeO mentioned in the paper published by Ratnasamy et al. in Journal of Catalysis 221(2004), 455-465 in 2004 2 -ZrO 2 catalyst, at a temperature of 175 °C, O 2 Under the condition of / CO of 1.25, the 0.49vol% CO in the hydrogen-rich gas is reduced to 140ppm, but the CO conversion rate and selectivity of the catalyst are low, and the temperature range of the catalyst is less than 25°C
The patent application of China Petroleum & Chemical Corporation (Patent No. CN92111005.7) involves a non-noble metal oxide CO combustion enhancer, the active component of which is: Cu-M 1 -M 2 -O(M 1 Refers to transition metals, such as Mn, Co; M 2 It is a rare earth metal, such as Ce), which has the same performance as the industrial noble metal Pt or Pd combustion accelerant, and exhibits good catalytic activity and hydrothermal stability under the condition of reaction temperature of 550-650°C and oxygen concentration equivalent to CO concentration , but it has not been reported whether this catalyst can perform catalytic performance under low temperature and hydrogen-rich conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Adopt co-current coprecipitation method to prepare catalyzer, take by weighing copper nitrate 0.49g respectively, cerium nitrate 8g, zinc nitrate 0.61g are made into mixed solution 1, the sodium carbonate solution of preparation 0.5M is solution 2, solution 1 and solution 2 are in violent Stir at a constant speed and drop into the precipitation tank. During the precipitation process, the temperature is controlled at 70 ° C, and the pH value is kept at 10. After the precipitation is complete and aged for 3 hours, filter with deionized water and wash until neutral. At 110 ° C Dry for 12 hours, and bake at 600°C for 5 hours to obtain the catalyst of the present invention.

[0028] Take 0.3g of the 40-60 mesh catalyst prepared in this example, dilute it with quartz sand of the same particle size, put it into a quartz reaction tube with an inner diameter of 7mm, activate it with 50ml / min air at 300°C for 2 hours, and then switch to hydrogen-rich gas, gas Composition is 65%H ...

Embodiment 2

[0030]Weigh 0.49g of copper nitrate, 8g of cerium nitrate, and 1.18g of yttrium nitrate to make mixed solution 1, prepare 0.4M ammonium carbonate solution as solution 2, and drip solution 1 and solution 2 into the precipitate under constant stirring. In the tank, during the precipitation process, the temperature was controlled at 90°C, and the pH value was maintained at 9. After the precipitation was complete and aged for 3 hours, it was filtered with deionized water, washed to neutrality, dried at 110°C for 12 hours, and dried at 700°C. Calcined for 4h, the catalyst of the present invention is obtained.

[0031] Take 0.3g of the 40-60 mesh catalyst prepared in this example, dilute it with quartz sand of the same particle size, put it into a quartz reaction tube with an inner diameter of 7mm, activate it with 50ml / min air at 300°C for 2 hours, and then switch to hydrogen-rich gas, gas Composition is 65%H 2 , 25% CO 2 , 1% CO, 9% H 2 O. When the reaction temperature is 200°...

Embodiment 3

[0033] Weigh 0.49g of copper nitrate, 8g of cerium nitrate, and 0.59g of magnesium nitrate to make mixed solution 1, prepare 0.5M sodium carbonate solution as solution 2, and drip solution 1 and solution 2 into the precipitate at constant speed under vigorous stirring. In the tank, the temperature was controlled at 70°C during the precipitation process, and the pH value was kept at 10. After the precipitation was complete and aged for 3 hours, it was filtered with deionized water, washed to neutrality, dried at 110°C for 12 hours, and dried at 600°C. Calcined for 4 hours, the catalyst of the present invention is obtained.

[0034] Take 0.3g of the 40-60 mesh catalyst prepared in this example, dilute it with quartz sand of the same particle size, put it into a quartz reaction tube with an inner diameter of 7mm, activate it with 50ml / min air at 300°C for 2 hours, and then switch to hydrogen-rich gas, gas Composition is 65%H 2 , 25% CO 2 , 1% CO, 9% H 2 O. When the reaction t...

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PUM

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Abstract

The invention relates to a catalyst for CO selective oxidation in hydrogen-rich gas of fuel battery electric vehicle, and its preparing process, wherein the catalyst comprises main active component of CuO, an auxiliary active component of CeO2, and another auxiliary active component comprising MgO, Li2O, Y2O3, ZnO, Fe2O3 or MnO2. The catalyst is prepared by using parallel flow co-precipitation method or sol-gal process.

Description

technical field [0001] The present invention relates to a catalyst and a preparation method thereof, in particular to a catalyst for the selective oxidation of CO in a hydrogen-rich gas and a preparation method thereof, which can reduce the content of CO in a hydrogen-rich gas to below 100ppm in a wide temperature range, even Below 10ppm, which meets the actual working conditions of the fuel cell. Background technique [0002] Proton exchange membrane fuel cell is a high-efficiency, pollution-free power generation device that utilizes the principle of electrochemical reaction and uses hydrogen or hydrogen-rich gas as fuel. Liquid fuels, such as methanol and gasoline, are used to supply fuel for fuel cell electric vehicles through the portable reformer, which solves the inconvenience of pure hydrogen fuel in vehicle, storage and transportation. At present, the electrode material of PEMFC is generally Pt, and a small amount of CO will make it irreversibly poisoned, so the con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/00B01J23/83B01J23/72C01B3/58
Inventor 董新法邹汉波林维明
Owner SOUTH CHINA UNIV OF TECH