Louis S. Socha

Impact of catalyst support design parameters on FTP emissions

This study investigated the performance of various designs of ceramic monolithic catalyst supports for automotive emissions control. The conclusion is that higher volume and/or higher cell density monoliths will yield improved catalytic performance using equal or less total precious metal per converter

Impact of Catalyst Support Design Parameters on Automotive Emissions

Ceramic monolithic catalyst supports have been an integral part of automotive emissions control systems since the early 70s. This investigation examines the impact of physical (cell density, frontal area, volume) and material (porosity, thermal mass) design parameters on vehicle emissions and pressure drop. This study indicates that CO and HC emissions can be reduced by larger volume and/or higher cell density substrates. Materials changes have little or no impact on catalyst performance. Pressure drop is increased by using a longer substrate, and dramatically reduced with a larger frontal area part.

Design and performance of a ceramic preconverter system

Abstract The preconverter is an essential element of exhaust gas treatment to help meet the tighter emission stnadards of TLEV and LEV levels. Its design must be so chosen as to meet the simultaneous requirements of compactness, faster light-off, low back pressure, high temperature durability and low cost. This paper presents design options and performance data for a ceramic preconverter system which meets the above requriements. In addition, the high temperature physical durability data for selected preconverter systems are presented. These durability back pressure, light-off and aging data presented here clearly demonstrate that a propertly designed ceramic preconverter system is a viable and cost-effective approach to meeting TLVE and LEV emission standards.