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Towards Cleaner Vehicle Emissions: Catalyst Technologies for Today and Tomorrow

Andrew P. York 

Johnson Matthey Technology Centre, Blount's Court, Reading RG49NH, United Kingdom

Abstract

Catalytic converters are essential for controlling harmful vehicle exhaust emissions, and are an integral part of most vehicles sold in Europe and America. Diesel vehicles provide a specific challenge due to the very lean nature of diesel exhaust. Ever tightening diesel emissions legislation will necessitate a blend of advances in engine design, electronic vehicle control systems, and catalytic devices.

In this lecture methods for tackling diesel (and lean burn) vehicle exhaust emissions using catalytic devices in production today will be presented, as well as some advances in the industry, and future requirements and challenges for tomorrow’s catalysts.

The lecture will begin by addressing the systems level, where different catalytic devices are combined to give the required emissions control performance, e.g. the Continuously Regenerating Trap (CRT®), or a diesel oxidation catalyst (DOC) plus selective catalytic reduction (SCR) catalyst.

The next level of system design is to combine the catalyst and the filter function into one device, e.g. catalysed DPF (CDPF), resulting in a multi-functional catalyst; considerable space and cost savings are achievable, combined with excellent emissions control performance. Further recent developments in multifunctional emissions control catalyst design have looked at layering the individual catalysts; Isuzu’s lean NOx catalyst, and Honda’s NOx trap/SCR system will be shown.

In the future, the exhaust emissions aftertreatment industry faces a number of challenges, e.g. wide array of new fuels, and new engines (direct injection spark ignition). Aftertreatment devices will be necessary in a host of new applications: locomotives, marine, and non-road mobile machinery. There will be potential for industry and academics to contribute to the design of multifunctional catalysts by i) designing/combining catalyst functions on the micro- or nano-scale, and ii) improving systems by zoning/layering catalysts in a single monolith substrate.
 

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Presentation: Invited oral at E-MRS Fall Meeting 2008, Symposium D, by Andrew P. York
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-04-25 16:49
Revised:   2009-06-07 00:48