In this study, numerical simulation of preferential oxidation of carbon monoxide in a hydrogen-rich stream in a square micro-channel is performed using a finite volume method with the SIMPLE algorithm and power-law scheme. In order to perform such simulations, a three-step surface kinetics including hydrogen oxidation, carbon monoxide oxidation and water-gas shift reaction is applied for a Pt-Fe/y-AI₂0₃ catalyst and operating pressure of 1 atm. After validating the simulation results, various flow variables are evaluated, and the required reactive length of the micro-channel for depleting carbon monoxide from about 2% to less than 10 ppm is found. Furthermore, by considering carbon monoxide selectivity and conversion, effects of wall temperature in the range of 80 to 120°C, oxygen to carbon monoxide ratio from 1 to 3, and inlet mole fraction of water from dry to about 4% are investigated. It is found that increasing wall temperature, oxygen to carbon monoxide ratio, or water content can improve the performance of the microreactor in carbon monoxide removal. These results are in agreement with previous published data.
4th International Conference on Thermal Engineering: Theory and Applications (ICTEA 2009). Proceedings of the Fourth International Conference on Thermal Engineering: Theory and Applications (Abu Dhabi, UAE 12-14 January, 2009)