Search Results

Selective NOx recirculation (SNR), involving adsorption, selective external recirculation and decomposition of the NOx by the combustion process, is itself a promising technique to abate NOx emissions. Three types of materials containing Ba: barium aluminate, barium tin perovskite and barium Y-zeolites have been developed to adsorb NOx under lean-burn or Diesel conditions, with or without the presence of S02. All these materials adsorb NO2 selectively (lean-burn conditions), and store it as nitrate/nitrite species. The desorption takes place by decomposition of these species at higher temperatures. Nitrate formation implies also sulfate formation in the presence of SO2 and SO3, while the NO2/SO2 competition governs the poisoning of such catalysts.

The Series Hybrid project is described concerning the scenario, technical data of vehicle and components and operating strategy. The two prototype cars offer an attractive driveability. Test results show high potential on emission reduction without increasing the consumption. The question is frequently asked as to which concept is the best. It is not so easy to answer this question. It can only mean: which concept is the best for a given application? In our opinion parallel hybrids make sense where a vehicle is required to be driven both conventionally and with electric drive only, e.g. conurbation scenario, driving and delivering in sensitive areas. In terms of weight, packaging and costs, a realization is much easier if electric-only propulsion is only required for a limited performance and range.