Striving to maintain or even reduce the concentration of CO2 in the Earth’s atmosphere makes it necessary to introduce "new" fuel carriers for use in vehicles. Therefore, efforts are being made to introduce new fuel carriers, specifically e-fuels. However, one should not forget about the existing solutions in this aspect, i.e. about biofuels. Usually, the introduction of new fuel carriers results in the development of internal combustion engines in two ways. One is to adapt the engine to the new fuel and the other is to adapt the new fuel to the existing engines. There are also indirect actions, i.e. that new engine solutions are useful both in the use of existing fuels and new fuels. Usually, such solutions concern the engine equipment or even just a change in the way of controlling the processes taking place in the engine. Engine accessories include: so-called internal catalyst. In this solution, some elements of the engine’s combustion chamber, such as glow plugs, are covered with a material constituting a carrier for the catalyst. In principle, the solution is to lead to a more complete combustion of fuel, thus reducing its consumption and, consequently, reducing CO2 emissions. This paper presents the impact of the application of this solution on CO2 emissions determined in the RDE test and discusses the possibility of achieving the intended goal in natural operation, i.e. with long-term use of vehicles. The results of the analyzes indicate a potentially positive impact of the use of an internal catalyst on reducing fuel consumption and, consequently, on reducing CO2 emissions.

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