Preferential oxidation of CO over CuO/CeO2 and Pt-Co/Al2O3 catalysts in micro-channel reactors

Design and testing of a microchannel reactor for the PROX reaction

“…This catalyst allowed the reduction of the CO concentration from 1 vol.% to 10 ppm. Kim et al [15] compared a CuO/CeO 2 coated microreactor with a Pt-Co coated microreactor showing better selectivities in the CO-PROX reaction for the copper-based catalyst.…”

“…Hwang et al [16] studied the reaction over a silicon-based microreactor coated with a Pt/Al 2 O 3 catalyst, yielding 99.4% CO conversion. Kim et al [15,17] obtained CO outlet concentration below 50 ppm at O 2 /CO ratio of 2.5 by using a 13-layered microchannel reactor built by stacking chemically etched stainless steel plates coated with a Pt-Co/Al 2 O 3 catalyst. Despite most of the work on CO-PROX in microreactors has been carried out using noble metal based catalysts a few insights on copper based catalysts have been reported.…”

“…Using a two-stage configuration this unit allowed reductions in the CO concentrations down to 15 ppm. Silicon wafers [13] or austenitic stainless steel plates [14,15] were used for building microchannel reactors for the PROX reaction. Hwang et al [16] studied the reaction over a silicon-based microreactor coated with a Pt/Al 2 O 3 catalyst, yielding 99.4% CO conversion.…”

Development of a multi-layered micro-reactor coated with Pt–Co/Al2O3 catalyst for preferential oxidation of CO

“…Especially, 5 wt% Pt-9 wt% Co/Al 2 O 3 catalyst showed remarkable low-temperature activity exhibiting excellent performance over 99% CO conversion in the wide temperature range of 50-125 8C. However, when Co/Pt weight ratio was more than 1.8, the activity rather decreased because excessive promoter covered active sites (Pt) [19]. In addition, the activity decreased with increasing Co/Pt weight ratio in the high temperature region (>150 8C).…”

“…These issues are much helpful to handle in micro-reactors due to their principal benefits including fast transfers of heat and mass, high surface to volume ratio, and decrease of volume [16][17][18]. In our previous work, we found that the serial reactor prepared by connecting the two micro-reactors coated with different catalysts (CuO/CeO 2 and Pt-Co/Al 2 O 3 ) exhibited excellent performance for PROX [19]. However, further developments were required to reduce the volume of the PROX reactor for portable fuel processor.…”