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Soot and NOx, may react in situ with each other and reduce, thus, their emissions. Therefore, this reaction can be considered as a strategy of elimination of both air pollutants at the same time. In general, it is well established that heterogeneous reactions between soot and the different gases, generally existent in combustion environments, are affected by soot properties. Detailed characterization of soot samples coupled to reactivity studies towards O2 and NO have been carried out in order to identify the differences and similarities among the kinds of soot studied for understanding in what extent the origin of soot samples is a key parameter on their structure and reactivity. The combined analysis and interpretation of the soot chemical-physical features are essential to correctly interpret and to predict its behavior in the combustion chamber when soot is in contact with the combustion gases at high temperature.

Nowadays, alcohol fuels are of increasing interest as alternative transportation biofuels even in compression ignition engines because they are oxygenated and producible in a sustainable way. In this paper, the experimental research activity was conducted on a single cylinder research engine provided with a modern architecture and properly modified in a dual-fuel (DF) configuration. Looking at ethanol the as one of the future environmental friendly biofuels experimental campaign was aimed to evaluate in detail the effect of the use of the ethanol as port injected fuel in diesel engine on the size, morphology, reactivity and chemical features of the exhaust emitted soot particles. The engine tests were chosen properly in order to represent actual working conditions of an automotive light-duty diesel engine. A proper engine Dual-Fuel calibration was set-up respecting prefixed limits on in-cylinder peak firing pressure, cylinder pressure rise, fuel efficiency and gaseous emissions.