Advanced Performance of Metallic Converter Systems Demonstrated on a Production V8 Engine

Abstract

It has been shown within the catalyst industry that the emission performance with higher cell density technology and therefore with higher specific geometric area is improved. The focus of this study was to compare the overall performance of high cell density catalysts, up to 1600cpsi, using a MY 2001 production vehicle with a 4.7ltr.V8 engine. The substrates were configured to be on the edge of the design capability. The goal was to develop cost optimized systems with similar emission and back pressure performance, which meet physical and production requirements. This paper will present the results of a preliminary computer simulation study and the final emission testing of a production vehicle. For the pre-evaluation a numerical simulation model was used to compare the light-off performance of different substrate designs in the cold start portion of the FTP test cycle. Four sets of converters were aged for 72 hours at 1025°C on an engine dynamometer stand, which is equivalent to 50k mile road driving condition. The emission performance of the catalysts was tested according the FTP75 driving cycle in close coupled and toe board position. In addition emission testing, back pressure tests before and after aging were also carried out.

Process Intensification in Chemical Reaction Engineering

“…Monolithic packings consist of an array of parallel flow channels, and combine large specific surface areas of several 1000 m 2 /m 3 with high porosities of 80% or more [25] (see Figure 3). Usually, monolithic packings are manufactured by extrusion of a ceramic paste (hydraulic channel diameters down to 0.7 mm [26]) or by wrapping a set of straight and corrugated metal sheets (hydraulic channel diameters down to 0.6 mm [27]). Even smaller channel diameters, of 100 µm or less, can be generated by mechanical processing; by milling, for example, or by chemical processing, e.g., etching of foils which are afterwards stapled and connected by welding or bolted fastenings.…”

Reactor Selection for Upgrading Hemicelluloses: Conventional and Miniaturised Reactors for Hydrogenations

“…[87]. Ceramic structures typically contain up to 1200 cells per square inch (cpsi), i.e., hydraulic diameters down to 0.7 mm [88], whereas cell densities in metal structures may reach 1600 cpsi, i.e., channel diameters down to 0.6 mm [89].…”

Innovative Metallic Substrates for Exhaust Emission Challenges for Gasoline and Diesel Engines

“…Calculated Conversion as a function of channel lengthAlso decreasing the channel size by increasing the substrate cell density increase the mass transfer coefficient. The industry takes advantage of higher cell density substrate technology to build more cost effective fast light-off converter systems[1,2,3].…”