@misc{RichterRachowIsraeletal., author = {Richter, Jana and Rachow, Fabian and Israel, Johannes and Roth, Norbert and Charlafti, Evgenia and G{\"u}nther, Vivien and Flege, Jan Ingo and Mauß, Fabian}, title = {Reaction Mechanism Development for Methane Steam Reforming on a Ni/Al2O3 Catalyst}, series = {Catalysts}, volume = {13}, journal = {Catalysts}, number = {5}, issn = {2073-4344}, doi = {10.3390/catal13050884}, pages = {23}, abstract = {In this work, a reliable kinetic reaction mechanism was revised to accurately reproduce the detailed reaction paths of steam reforming of methane over a Ni/Al2O3 catalyst. A steady-state fixed-bed reactor experiment and a 1D reactor catalyst model were utilized for this task. The distinctive feature of this experiment is the possibility to measure the axially resolved temperature profile of the catalyst bed, which makes the reaction kinetics inside the reactor visible. This allows for understanding the actual influence of the reaction kinetics on the system; while pure gas concentration measurements at the catalytic reactor outlet show near-equilibrium conditions, the inhere presented temperature profile shows that it is insufficient to base a reaction mechanism development on close equilibrium data. The new experimental data allow for achieving much higher quality in the modeling efforts. Additionally, by carefully controlling the available active surface via dilution in the experiment, it was possible to slow down the catalyst conversion rate, which helped during the adjustment of the reaction kinetics. To assess the accuracy of the revised mechanism, a monolith experiment from the literature was simulated. The results show that the fitted reaction mechanism was able to accurately predict the experimental outcomes for various inlet mass flows, temperatures, and steam-to-carbon ratios.}, language = {en} } @misc{FrankenRachowCharlaftietal., author = {Franken, Tim and Rachow, Fabian and Charlafti, Evgenia and Flege, Jan Ingo and Jenssen, Martin and Verma, Rakhi and G{\"u}nther, Vivien and Mauss, Fabian}, title = {Numerical investigation of oxy-methane combustion for stationary engines}, series = {40th International Symposium on Combustion}, journal = {40th International Symposium on Combustion}, abstract = {This work presents a numerical investigation of turbulent oxyfuel combustion of methane in a gas engine with passive pre-chamber. The experimental data of a motored operating point at 1600 rpm and natural gas fired operating point at 2450 rpm, 6 bar IMEP and λ=1.5 are provided by TU Freiberg to validate the simulation model. The performance of the detailed chemistry model of Shrestha et al. predicting laminar burning velocity of premixed methane-oxygen flames is evaluated using the experiments of Mouze-Mornettas et al. The detailed chemistry model predicts the laminar flame speed within an accuracy range of ±10\% for elevated pressure, temperature, and different equivalence ratios. For predicting the turbulent combustion in the gas engine, a three-dimensional (3D) Large Eddy Simulation (LES) with G Equation model and laminar flame speed look-up tables is used. The chemistry in the unburnt and burnt gas is solved using a constant volume detailed chemistry solver. The 3D LES model shows a good match of the motored and natural gas fired in-cylinder pressure profile. Subsequently the fuel is switched to methane and oxygen is used as oxidizer. The 3D LES results show an increase of maximum cylinder pressure up to 100 bar for λ=1.5, and the turbulent flame regime is shifted towards high Damk{\"o}hler numbers compared to combustion with air. Diluting the cylinder gas with 50 mole-\% CO2 or 65 mole-\% H2O shows a significant reduction of peak cylinder pressure, and lower Damk{\"o}hler and higher Karlovitz numbers compared to methane-oxygen combustion.}, language = {en} } @misc{VermaGuentherCharlaftietal., author = {Verma, Rakhi and G{\"u}nther, Vivien and Charlafti, Evgenia and Rachow, Fabian and Giri, Binod Raj and Hemaizia, Abdelkader and Th{\´e}venin, Dominique and Flege, Jan Ingo and Mauss, Fabian}, title = {Development of detailed surface reaction mechanism for methanation process based on experiments}, series = {Proceedings in applied mathematics and mechanics : PAMM}, volume = {26}, journal = {Proceedings in applied mathematics and mechanics : PAMM}, number = {1}, publisher = {Wiley}, address = {Weinheim}, issn = {1617-7061}, doi = {10.1002/pamm.70061}, pages = {1 -- 6}, abstract = {The pressure to reduce greenhouse gas emissions is growing, which demands new and innovative technologies to produce mobile as well as stationary energy. The methanation offers a pathway to reduce greenhouse gas emissions by directly converting to . This also plays a crucial role in "power-to-gas" (P2G) technologies by providing an approach to store excess renewable energy in the form of methane in an existing natural gas infrastructure. However, methanation is a complex process due to its exothermic nature, interaction of the gas species with the catalyst, and possible catalyst degradation. Therefore, a deeper understanding is required for the methanation reaction, its different reaction pathways, and side reactions. In this work, we aim to understand the direct production of synthetic natural gas from and in a Sabatier process with the help of experiments over a Ni/ catalyst. A detailed surface reaction mechanism is developed to extend the study numerically by validating the simulation results with the experimental data. A one-dimensional model, LOGEcat, based on a single-channel catalyst model, is used for kinetic modeling. Experiments as well as simulations have been performed at various conditions, such as temperature variation and dilution to the inlet composition. We have successfully captured the experimental trends using the kinetic model developed for the conditions considered for the analysis.}, language = {en} } @misc{MaussMachalDelfauetal., author = {Mauß, Fabian and Machal, C. and Delfau, J.-L. and Vovelle, C. and Mor{\´e}ac, Gladys and Mounam-Rousselle, G.}, title = {Modelling of Aromatics and Soot Formation from Large Fuel Molecules}, series = {Proceedings of the Combustion Institute}, volume = {32}, journal = {Proceedings of the Combustion Institute}, number = {1}, issn = {0082-0784}, pages = {753 -- 760}, language = {en} } @misc{MaussAhmedZeuch, author = {Mauß, Fabian and Ahmed, Syed Sayeed and Zeuch, Thomas}, title = {The Generation of a Compact n-Heptane / Toluene Reaction Mechanism Using the Chemistry Guided Reduction (CGR) Technique}, series = {Zeitschrift f{\"u}r Physikalische Chemie}, volume = {223}, journal = {Zeitschrift f{\"u}r Physikalische Chemie}, number = {4-5}, issn = {0942-9352}, pages = {551 -- 563}, language = {en} } @misc{MaussHoffmeyerMontefrancescoetal., author = {Mauß, Fabian and Hoffmeyer, Henrik and Montefrancesco, Emanuela and Beck, Linda and Willand, J{\"u}rgen and Ziebert, Florian}, title = {CARE - Catalytic Reformated Exhaust gases in turbocharged DISI-Engines}, series = {SAE International Journal of Fuels and Lubricants}, volume = {2}, journal = {SAE International Journal of Fuels and Lubricants}, number = {1}, issn = {1946-3952}, pages = {139 -- 148}, language = {en} } @misc{MaussNakovWenzeletal., author = {Mauß, Fabian and Nakov, Galin and Wenzel, Paul and Steiner, R{\"u}diger and Kr{\"u}ger, Christian and Zhang, Yongzeh and Rawat, Rajesh and Borg, Andreas and Perlman, Cathleen and Fr{\"o}jd, Karin and Lehtiniemi, Harry}, title = {Soot Simulation under Diesel Engine Conditions Using a Flamelet Approach}, series = {SAE International Journal of Engines}, volume = {2}, journal = {SAE International Journal of Engines}, number = {2}, issn = {1946-3936}, pages = {89 -- 104}, language = {en} } @misc{MaussBlurockTuner, author = {Mauß, Fabian and Blurock, Edward S. and Tuner, Martin}, title = {Phase Optimized Skeletal Mechanisms for Engine Simulations}, series = {Combustion Theory and Modelling}, volume = {14}, journal = {Combustion Theory and Modelling}, number = {3}, issn = {1364-7830}, pages = {295 -- 313}, language = {en} } @misc{MaussLovasMalik, author = {Mauß, Fabian and L{\o}v{\aa}s, Terese and Malik, Nadeem}, title = {Global reaction mechanism for ethylene flames with preferential diffusion}, language = {en} } @misc{MaussMalikLovas, author = {Mauß, Fabian and Malik, Nadeem and L{\o}v{\aa}s, Terese}, title = {The Effect of Preferential Diffusion on the Soot Initiation Process in Ethylene Diffusion Flames}, series = {Flow Turbulence and Combustion}, volume = {87}, journal = {Flow Turbulence and Combustion}, number = {2-3}, issn = {1386-6184}, pages = {293 -- 312}, language = {en} }