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Internal combustion engines can be operated fuel-rich, producing valuable product gases containing chemicals instead of exhaust gases. At the Chair of Thermodynamics, engine models are developed for this purpose and validated based on experimental data. In addition, process concepts are developed that consider the separation of chemicals, such as hydrogen.

The research results show that engines with homogeneous charge compression ignition and the addition of additives such as ozone are suitable for fuel-rich operation. The process is more efficient than conventional methods, such as steam reforming of natural gas to hydrogen and carbon monoxide, or cogeneration in spark-ignition gas engines. In this context, the cost of the electricity produced is competitive with that of renewable energy systems, and the cost of hydrogen production is comparable to electrolysis.

By flexibly adapting the engine's operating conditions to the demand for electricity, heat, and chemicals, this process can make an important contribution in the future to stabilizing the power grids and achieving climate targets.