Effect of an economical oxidation catalyst formulation on regulated and unregulated pollutants from natural gas fueled heavy duty transit buses

2011 ◽  
Vol 16 (6) ◽  
pp. 469-473 ◽  
Author(s):  
Arvind Thiruvengadam ◽  
Daniel K. Carder ◽  
Mohan Krishnamurthy ◽  
Adewale Oshinuga ◽  
Mridul Gautam
Keyword(s):  
Natural Gas ◽  
Oxidation Catalyst ◽  
Heavy Duty ◽  
Transit Buses ◽  
Gas Fueled

Development of a Heavy Duty On-Highway Natural Gas-Fueled Engine

1992 ◽  
Author(s):  
Roy Meyer ◽  
David Meyers ◽  
Syed M. Shahed ◽  
Vinod K. Duggal
Keyword(s):  
Natural Gas ◽  
Heavy Duty ◽  
Gas Fueled

Development of an Advanced Retrofit Aftertreatment System Targeting Toxic Air Contaminants and Particulate Matter Emissions From HD-CNG Engines

2010 ◽  
Author(s):  
Hemanth Kappanna ◽  
Marc C. Besch ◽  
Daniel K. Carder ◽  
Mridul Gautam ◽  
Adewale Oshinuga ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Natural Gas ◽  
Exhaust Aftertreatment ◽  
Heavy Duty ◽  
Air Contaminants ◽  
Number Count ◽  
Transit Buses ◽  
Order Of Magnitude ◽  
Toxic Air Contaminants ◽  
In Transit

Increasing urban pollution levels have led to the imposition of evermore stringent emissions regulations on heavy-duty engines used in transit buses. This has made compressed natural gas (CNG) a promising fuel for reducing emissions, particularly particulate matter (PM) from heavy-duty transit buses. Indeed, research studies performed at West Virginia University (WVU) and elsewhere have shown that pre-2010 compliant natural gas engines emit an order of magnitude lower PM emissions, on a mass basis, when compared to diesel engines without any exhaust aftertreatment devices. However, on a number basis, particle emissions in the nanoparticulate range were an order of magnitude higher for natural gas fueled buses than their diesel counterparts. There exists a significant number of pre-2007 CNG powered buses in transit agencies in the US and elsewhere in the world. Therefore, an exhaust aftertreatment device was designed and developed by WVU, in association with Lubrizol, to retrofit urban transit buses powered by MY2000 Cummins Westport C8.3G+ heavy-duty CNG engines, and effectively reduce Toxic Air Contaminants (TAC) and PM (mass and number count) exhaust emissions. The speciation results showed that the new exhaust aftertreatment device reduced emissions of metallic elements such as iron, zinc, nonmetallic minerals such as calcium, phosphorus and sulfur derived from lube oil additives to non-detectable levels, which otherwise could contribute to an increase in number count of nanoparticles. The carbonyl compounds were reduced effectively by the oxidation catalyst to levels below what were found in the dilution air. Also, hydrocarbons identified as TAC’s by California Air Resource Board (CARB) [1] were reduced to non-detectable levels. This ultimately reduced the number of nanoparticles to levels equal to that found in the dilution air.

Transient Emissions from Two Natural Gas-Fueled Heavy-Duty Engines

1993 ◽  
Author(s):  
Christopher A. Sharp ◽  
Terry L. Ullman ◽  
Kenneth R. Stamper
Keyword(s):  
Natural Gas ◽  
Heavy Duty ◽  
Gas Fueled ◽  
Transient Emissions

In-Use Emissions from Natural Gas Fueled Heavy-Duty Vehicles

1999 ◽  
Author(s):  
Robert L. McCormick ◽  
Michael S. Graboski ◽  
Teresa Alleman ◽  
Andrew M. Herring ◽  
Paul Nelson
Keyword(s):  
Natural Gas ◽  
Heavy Duty ◽  
Gas Fueled ◽  
Heavy Duty Vehicles

Emissions of Toxic Pollutants from Compressed Natural Gas and Low Sulfur Diesel-Fueled Heavy-Duty Transit Buses Tested over Multiple Driving Cycles

2005 ◽  
Vol 39 (19) ◽  
pp. 7638-7649 ◽  
Author(s):  
Norman Y. Kado ◽  
Robert A. Okamoto ◽  
Paul A. Kuzmicky ◽  
Reiko Kobayashi ◽  
Alberto Ayala ◽  
...  
Keyword(s):  
Natural Gas ◽  
Heavy Duty ◽  
Compressed Natural Gas ◽  
Toxic Pollutants ◽  
Driving Cycles ◽  
Transit Buses ◽  
Low Sulfur
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