| 摘要 |
<p>Extruded rectangular-channel ceramic honeycombs wherein the channels have a rectangular cross-section of aspect ratio 1.2:1 or greater and a hydraulic diameter Dh and constant temperature Nusselt Number N mu ("shape" heat transfer characteristic) yielding an "effective" channel surface area factor N mu /Dh of at least about 70, provide catalytic substrates for engine exhaust emissions control offering better light-off performance, enhanced conversion efficiency at current converter pressure drops, and/or equivalent efficiency at reduced pressure drops. <IMAGE></p> |
