Steffen Tischer

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Background: In the recent past fuel cells have gained the attention of scientists and engineers. They are ideal candidates for generating clean energy, a concept which is becoming increasingly important where global warming and related issues are of much concern. These chemical to electrical energy converting devices find application in numerous fields,(More)
This work focuses on the development and improvement of numerical tools for the simulation of catalytic monolith reactors. These simulations cover detailed descriptions of reaction mechanisms, transport in gas-phase and washcoats, fluid flow in single channels, and the entire reactor. In DETCHEM MONOLITH , the concept of building a transient model of the(More)
An experimental and kinetic modeling study on the Ni-catalyzed conversion of methane under oxidative and reforming conditions is presented. The numerical model is based on a surface reaction mechanism consisting of 52 elementary-step like reactions with 14 surface and six gas-phase species. Reactions for the conversion of methane with oxygen, steam, and CO2(More)
Background: Solid-oxide fuel cells (SOFCs) have gained substantial interest in recent time as high efficiency electrical sources. A unique combination of advantages such as high reaction kinetics, poison tolerance, utilization of inexpensive catalysts, high power density, fuel flexibility and low emissions have helped SOFCs find application in the(More)
Numerical simulations are increasingly assisting research and development in the field of emission control of automotive vehicles. Our work focuses on the prediction of the tail-pipe emissions, based on a numerical simulation of the automotive catalytic converter. Besides the prediction of the tail-pipe emissions, an understanding of the processes occurring(More)
The paper discusses how the understanding of the chemical and physical processes on a molecular level supports the design and optimization of heterogeneous (gas-solid) chemical reactors and processes following an approach of hierarchical models reaching from quantum mechanical simulation to Computational Fluid Dynamics. Several applications in the areas of(More)
2-D convection-diffusion, reacting flows in a single channel of catalytic monoliths are investigated. The fluid dynamics are modelled by a steady state, boundary-layer equations, which is a large system of parabolic partial differential equations (PDEs) with nonlinear boundary conditions arising from the coupling between the gas-phase and surface processes.(More)
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