Abstract Hydrogen combustion engines can contribute to CO 2 -free mobility. However, they produce NO x emissions, albeit only an extremely small extent when operated very leanly. One approach reduce these emissions even further is use exhaust gas aftertreatment systems like storage catalysts (NSC). So far, have mainly been used in diesel or gasoline applications. This contribution shows that un...

Abstract Selective Catalytic Reduction (SCR) technology is currently used to effectively reduce NO x emissions for diesel engines. The present study aims at building a three-dimensional numerical model evaluate the conversion efficiency and NH 3 slip in an SCR system, reducing time resources necessary design development process. A of system has been built integrate species transport, heat trans...

Three types of uncatalyzed diesel particulate filter (DPF) systems, three types of high-temperature disposable filter elements (DFEs), and one diesel oxidation catalytic converter (DOC) were evaluated in underground mine conditions for their effects on the concentrations and size distributions of diesel aerosols. Those effects were compared with the effects of a standard muffler. The experiment...

Commercial vehicles require fast aftertreatment heat-up to move the SCR catalyst into most efficient temperature range meet upcoming NO X regulations while minimizing CO 2 . One solution this challenge is add a fuel burner upstream of con`ventional heavy-duty diesel system. The focus paper optimize based thermal management approach. objective included complying with CARB’s 2027 low emissions st...

This paper reviews the emissions of reactive nitrogen compounds (RNCs) from modern vehicles fitted with spark ignition en-gines and three-way catalysts. Specific aspects pollutants involved – their formation are discussed. Cold start driving cycles scenarios under which all four RNCs can be significant; mechanisms behind trends ex-plored. Experimental data obtained two tested over different col...

Abstract Bifunctional Fe–Pt ammonia slip catalysts were studied by operando quick-scanning extended X-ray absorption fine structure spectroscopy (QEXAFS) under conditions mimicking rapid temperature variations that occur in an automotive exhaust gas aftertreatment system during real driving. Two catalysts, Pt/Al 2 O 3 and Fe-ZSM-5, tested individually, as mixtures dual bed arrangements. Applyin...

While operating at light loads, diesel pilot-ignited natural gas engines with lean premixed suffer from poor combustion efficiency and high methane emissions. This work investigates the limits of low-load operation for a micro-pilot engine that uses stoichiometric mixture to enable nitrogen oxide emission control. By optimizing hardware, conditions, injection strategies, this study focused on d...