CO low-temperature oxidation catalyst and preparation method thereof

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...

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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.