Carbon Monoxide Fine Clean-Up in Monolithic Reactors

Carbon Monoxide Fine Clean-Up in Monolithic Reactors 

Dokupil et al. [542] described a monolithic preferential oxidation reactor operated at 100 °C and 15 000h gas hourly space velocity. It carried an integrated heat-exchanger to improve its thermal management. 

Zhou et al. reported the operation of a monolithic preferential oxidation reactor system in a 5-kW methanol reformer for a duration of 14h [322]. Carbon monoxide was reduced to less than 50 ppm, however, four stages of oxygen addition were required to achieve this result. 

Chin et al. performed the reaction over metal foams of 2.54-cm diameter and 5.1-cm length with different pore densities [547]. The catalyst was composed of 5 wt.% platinum and 0.5 wt.% iron on alumina. The foams had either 40 or 20 pores per inch and contained either 4 or 12 wt.% of the catalyst. Higher conversion was achieved for the smaller pores and lower catalyst loading on the foam. However, conversion decreased when the reaction temperature was increased starting from 100 °C and full conversion could not be achieved. This was attributed to hot spot formation despite the low O/CO ratio between 1.0 and 2.0 that was applied. Comparable results were achieved with ceramic monoliths of similar size. 

Ahluwalia et al. reported on experiments with cordierite monoliths applied for the preferential oxidation of carbon monoxide [548]. The monoliths had 7.62-cm diameter and 12.7-cm length. A commercial catalyst from Engelhard was used for the experiments, which lit-off even at room temperature. Reformate surrogate was 

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