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

The paper discusses the performance of heavy-duty natural gas transit buses retrofitted with economic oxidation formulation oxidation catalysts in reducing regulated and unregulated emissions. The regulated emissions exhibited a 99% reduction in emissions of carbon monoxide, a 62% reduction in emissions of hydrocarbons with the presence of the oxidation catalyst, and a 96% decrease in carbonyl compound emissions. The catalyst formulation effectively targeted the lower chain volatile hydrocarbon fraction in the exhaust, which generally requires high light-off temperatures. Overall, the catalyst produced a 93% reduction in emissions of volatile organic compounds and was effective in reducing PAH emissions by 46%.

► Study of heavy-duty natural gas transit buses retrofitted with an economic oxidation formulation oxidation catalyst finds regulated emissions fell carbon monoxide by 99%, hydrocarbons by 62%, and carbonyl compound by 96%.
► Overall, the catalyst produced a 93% reduction in emissions of volatile organic compounds and was also effective in reducing PAH emissions by 46%.