Comparative analysis of catalytic retrofits for particulate matter reduction in school bus passenger compartments under realistic operating conditions

Three retrofit technologies for tailpipe and crankcase emissions were studied determine their impact on the particulate matter levels in bus cabins. The catalytic options evaluated were the Johnson & Matthey's Continuous Regenerating Technology (CRT), the Environmental Solutions Worldwide's Particulate Reactor for tailpipe emissions; and the Spiracle Crankcase Filter system for blow-by emissions by Donaldson. Using the CRT and the Particulate Reactor showed significant reduction in particulate matter. The use of the crankcase resulted also in a reduction in particulate matter with the adverse effect of an increase on CO levels at the exhaust. This is an abstract of a paper presented at the AIChE Annual Meeting (Salt Lake, UT 11/4-9/2007).