If it hadn't been for the development of copper zeolite as a catalyst to use in reducing nitrogen oxides (NOx), Cummins might have been right alongside Navistar in using increased levels of exhaust ...

NASHVILLE, Tenn. – In defiance of the widely-held belief that NOx aftertreatment systems such as SCR would be required to meet EPA2010 emissions standards, Cummins has announced its heavy-duty engines ...