| 摘要 |
A fuel processing system (FPS) ( 110 ) is provided for a fuel cell power plant ( 115 ) having a fuel cell stack assembly (CSA) ( 56 ). A water gas shift (WGS) reaction section ( 12, 120 ) of the FPS ( 110 ) reduces the concentration of carbon monoxide (CO) in the supplied hydrocarbon reformate, and a preferred oxidation (PROX) section ( 40 ) further reduces the CO concentration to an acceptable level. The WGS section ( 12, 120 ) includes a reactor ( 124 ) with a high activity catalyst for reducing the reformate Co concentration to a relatively low level, e.g., 2,000 ppmv or less, thereby relatively reducing the structural volume of the FPS ( 110 ). The high activity catalyst is active at temperatures as low as 250° C., and may be a noble-metal-on-ceria catalyst of Pt and Re on a nanocrystaline, cerium oxide-based support. Then only a low temperature PROX reactor ( 46 ) is required for preferential oxidation in the FPS ( 110 ). |
