Development of the 2010 Ford Diesel Truck Catalyst System

摘要: The choice to pursue Selective Catalytic Reduction (SCR) using aqueous urea as a NOx reductant for lean control on diesel vehicles was not an easy one. It difficult imagine infrastructure delivery of vehicles. In the 1990s, SCR technology best known its use in stationary source NOx. There were published studies potential effectiveness vehicle at steady state, most notably by Degussa [13], Volkswagen [23], and Hug Engineering [25]. Earlier, interesting work also being done Paul Scherrer Institute Switzerland [28]. Ford applied light-duty truck tested it with success transient cycles [43]. catalysts available that time included vanadia/titania, base metal/zeolite formulations copper or iron, usually ZSM-5. unknown if these catalyst types would ever be durable enough application, only hydrothermally but fuel sulfur contents order 500 ppm, approximately 50 times current level U.S. Europe today. uncertainty about integration particulate traps into systems, low temperature/high space velocity applications, handling issues, including freeze point replenishment.