NREL Completes Operations and Emissions Study of Class 6 Trucks Operating on Gas-to-Liquid Fuel
July 2004
NREL and its partners tested a fleet of six 2001 International Class 6 trucks operating in southern California for operability and emissions using gas-to-liquid (GTL) fuel and catalyzed diesel particle filters (CDPF). Three vehicles were fueled with CARB certification diesel fuel and no emission control devices and three vehicles were fueled with GTL fuel and retrofit with Johnson Matthey's CCRT™ filter. Results of the test demonstrated that over the New York City Bus (NYCB) cycle, GTL fuel reduced NOx and PM by 16% and 23%. Vehicles operating on GTL fuel and CDPF produced NOx and PM reductions of 20% and 97% respectively.
Researchers used a chassis dynamometer to test emissions over the CSHVR and NYCB cycles. The GTL-fueled vehicles were tested with and without the CDPFs to isolate fuel and aftertreatment effects.
All emission changes are compared to the CARB diesel baseline. Over the CSHVR cycle, GTL fuel reduced all regulated emissions, with nitrogen oxide (NOx) reductions of 8% and particulate matter (PM) reductions of 33%. Combining GTL and CDPF further reduced all regulated emissions, with NOx and PM reductions of 14% and 99%, respectively.
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