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CO low-temperature oxidation catalyst and preparation method thereof

An oxidation catalyst and low-temperature technology, applied in the field of CO low-temperature oxidation catalyst and its preparation, can solve the problems of catalyst stability not meeting application requirements, high reaction temperature, difficult to meet practical requirements, etc., and achieve excellent water resistance and carbon dioxide resistance. performance, low reaction temperature, water resistance and carbon dioxide resistance

Active Publication Date: 2009-07-22
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

[0005] But CuO-CeO 2 The problem with the catalyst is that the temperature for complete conversion of CO in a hydrogen-rich atmosphere containing water is relatively high (140-250°C), while the operating temperature range of the PEMFC fuel cell is 80-127°C
Although it can reduce CO reduction by 100ppm, but the reaction temperature is too high, it is difficult to meet the practical requirements
[0007] CuO / CeO prepared by co-precipitation method by Kim D.H. et al. 2 Catalyst (see Stud.Surf.Sci.Catal.2007 volume 167 page 171) in reaction atmosphere O 2 / CO=1 with 10% H 2 O and 15% CO 2 Under the conditions of existence, the reaction temperature is 170°C and the space velocity is 15000ml h -1 g -1 At this time, the CO conversion rate was 99%, and the selectivity was kept above 75%. Although the CO was reduced to below 100ppm, it was only maintained for 2 hours, and the stability of the catalyst was far from meeting the application requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Take Ce(NO 3 ) 3 ·6H 2 O97.65g and 6.00g Ti(SO 4 ) 2 (i.e. TiO 2 / CeO 2 Molar ratio is equal to 0.11) dissolved in 4000ml deionized water, stirred evenly, denoted as a. Dissolve 200g NaOH in 2200ml deionized water, stir evenly, 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 1000ml, wash 4 times with 2000ml of absolute ethanol, and dry at 110°C for 12 hours. In an air atmosphere, heat up to 500°C for 4 hours at a heating rate of 10°C / min, calcinate for 4 hours, press into tablets, and sieve to 40-60 mesh.

[0029] 2) Take 30 g of copper nitrate solution containing 20% ​​copper nitrate by mass fraction, impregnate it on 10 g of cerium-titanium carrier, dry at room temperature for 12 hours, dry at 110°C for 20 hours, and heat up to 600°C at a heating ...

Embodiment 2

[0032] 1) Take Ce(NO 3 ) 3 ·6H 2 O 86.80g and 12.00g Ti(SO 4 ) 2 (i.e. TiO 2 / CeO 2 Molar ratio is equal to 0.25) is dissolved in 4000ml deionized water, stirred evenly, denoted as a. Dissolve 400ml ammonia water in 2000ml deionized water, stir evenly, record as b. Add the solution in a to b dropwise (dropping speed is 15ml / min), stir evenly, when the pH is 12 after the dropwise addition, continue stirring for 3h. Stand at room temperature for 20 hours, filter and wash with deionized water 5 times, each time 1000ml, wash 3 times with 1500ml of absolute ethanol, and dry at 120°C for 20 hours. In an air atmosphere, the temperature was raised to 600°C for 4h at a heating rate of 10°C / min. Tablet forming, sieving to 40-60 mesh.

[0033] 2) Take 10 g of copper nitrate solution containing 30% copper nitrate by mass fraction, impregnate 10 g of cerium-titanium carrier, dry at room temperature for 12 hours, dry at 110°C for 20 hours, and heat up to 500°C at a heating rate of ...

Embodiment 3

[0036] 1) Take Ce(NO 3 ) 3 ·6H 2 O 76.00g and 18.00g Ti(SO 4 ) 2 (i.e. TiO 2 / CeO 2 Molar ratio is equal to 0.43) was dissolved in 4000ml deionized water, stirred evenly, denoted as a. 300g NaCO 3 Dissolve in 2000ml 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 1000ml, wash 4 times with 2000ml of absolute ethanol, and dry at 120°C for 12 hours. In an air atmosphere, the temperature was raised to 500°C for 4h at a heating rate of 3°C / min. Tablet forming, sieving to 40-60 mesh.

[0037] 2) Take 8g of copper nitrate solution containing 25% copper nitrate by mass fraction, impregnate 10g of cerium-titanium carrier, dry at room temperature for 12h, dry at 110°C for 20h, and heat up to 600°C at a heating rate of 5°C / min in an air atmos...

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PUM

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Abstract

The invention provides a CO low-temperature oxidation catalyst. The catalyst is characterized in that the catalyst consists of a CeO2-TiO2 compound oxide carrier and an active component of CuO, and the loading capacity of the active component of CuO is 1 to 20 weight percent, wherein the range of the mol ratio of TiO2 to CeO2 is 0.1-4. The coprecipitation method is adopted to prepare the cerium-titanium compound oxide carrier, and a copper nitrate solution is steeped on the carrier. The catalyst prepared by the method has highly efficient catalytic activity, and can realize the complete removal of CO in the temperature range of between 80 and 170 DEG C, and the highest selectivity reaches 100 percent; moreover, the catalyst also has good waterproof and CO2 resistant performances. The method has the advantages of simple preparation conditions, low production cost, and the like.

Description

technical field [0001] The invention belongs to a catalyst and a preparation method thereof, in particular to a CO low-temperature oxidation catalyst and a preparation method thereof. technical background [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 electrode of fuel cell to CO d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01J23/10B01J21/06C01B31/20B01D53/62C01B32/50
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
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