Research

NOₓ Emission Control for Hydrogen Engines (H₂-SCR) Selective catalytic reduction of NOₓ using hydrogen offers a promising pathway for clean exhaust treatment in hydrogen engines. Advanced catalyst materials and dynamic operation strategies improve activity, selectivity, and stability under challenging conditions such as high humidity. The approach contributes to efficient and low-emission hydrogen combustion systems. Further information

Tracking Catalytic Activity Across Scales (TrackAct C4) Catalyst performance emerges from interactions across molecular, structural, and reactor scales. Combining operando X-ray spectroscopy with laser-based diagnostics enables direct correlation of active site dynamics and spatially resolved reaction environments. This integrated framework advances the understanding and optimization of catalytic systems in space and time. Further information

Flow Field and Heat Flux in Impinging Jets Complex near-wall flow structures strongly influence local heat transfer, particularly on realistic rough surfaces. High-resolution infrared thermography, particle image velocimetry, and simulations provide spatially resolved insights into the coupled flow and thermal fields. These results establish a benchmark for understanding and optimizing advanced cooling strategies. Further information

Laser Diagnostics for Catalytic Reaction Systems Non-invasive laser diagnostics, including PLIF and Raman spectroscopy, provide spatially and temporally resolved species distributions inside catalytic reactors. The approach captures the interplay of transport processes and surface kinetics under realistic conditions. These insights support improved prediction and optimization of catalytic performance. Further information

Enhanced CO₂ Capture via Structured Falling Film Reactors Engineered surface structures induce instabilities and mixing in thin liquid films, significantly intensifying CO₂ absorption. The interaction between hydrodynamics and interfacial mass transfer is resolved through complementary experiments and simulations. The findings enable systematic design of more efficient gas–liquid contactors. Further information

Key Publications

A full list of publications is available via KITopen: Link

T. Häber, S. Moosmayer, F. Secchi, M. Raiola, D. Gatti, D. Trimis, R. Suntz, B. Frohnapfel, Spatially resolved heat transfer measurements of impinging jets on statistically rough surfaces using an infrared-based gradient sensor, Exp. Therm Fluid Sci. 177 (2026) 111797. https://doi.org/10.1016/j.expthermflusci.2026.111797.
T. Häber, C. Cárdenas, S. Vijayaraghavan, I.B. Othman, A. Zimina, F. Maurer, J.-D. Grunwaldt, O. Deutschmann, P. Lott, Performance enhancement of pd-based selective ammonia oxidation catalysts through forced dynamic operation, Appl. Catal. B Environ. Energy (2026) 127073. https://doi.org/10.1016/j.apcatb.2026.127073.
T. Häber, S. Wan, S. Struzek, C. Cárdenas, A. Zimina, F. Maurer, P. Lott, R. Suntz, J.-D. Grunwaldt, O. Deutschmann, Novel advanced channel reactor for spatio-temporal activity and catalyst state correlations applied for the reduction of NO by CO over Pt/Al₂O₃, Appl. Catal., A 712 (2026) 120748. https://doi.org/10.1016/j.apcata.2025.120748.
A. Düll, J. Lehmann, M. Börnhorst, C. Ateş, T. Häber, O. Deutschmann, Spatio-temporal characterization of the three-dimensional wave dynamics in falling film flows over rectangular corrugations, Exp Fluids 66 (2025) 71. https://doi.org/10.1007/s00348-025-03978-2.
T. Zirwes, T. Häber, F. Zhang, H. Kosaka, A. Dreizler, M. Steinhausen, C. Hasse, A. Stagni, D. Trimis, R. Suntz, H. Bockhorn, Numerical Study of Quenching Distances for Side-Wall Quenching Using Detailed Diffusion and Chemistry, Flow Turbul. Combust. 106 (2021) 649–679. https://doi.org/10.1007/s10494-020-00215-0.
T. Häber, R. Suntz, H. Bockhorn, Two-Dimensional Tomographic Simultaneous Multispecies Visualization—Part II: Reconstruction Accuracy, Energies 13 (2020) 2368. https://doi.org/10.3390/en13092368.
T. Häber, M. Gebretsadik, H. Bockhorn, N. Zarzalis, The effect of total reflection in PLIF imaging of annular thin films, Int. J. Multiphase Flow 76 (2015) 64–72. https://doi.org/10.1016/j.ijmultiphaseflow.2015.06.009.
T. Häber, K. Kleinermanns, Multiphoton Resonance Spectroscopy of Biological Molecules, in: M. Quack, F. Merkt (Eds.), Handbook of High‐resolution Spectroscopy, 1st ed., Wiley, 2011. https://doi.org/10.1002/9780470749593.hrs094.
T. Häber, A.C. Blair, D.J. Nesbitt, M.D. Schuder, CH stretch/internal rotor dynamics in ethyl radical: High-resolution spectroscopy in the CH₃-stretch manifold, J. Chem. Phys. 124 (2006) 054316. https://doi.org/10.1063/1.2140740.
T. Häber, U. Schmitt, C. Emmeluth, M.A. Suhm, Ragout-jet FTIR spectroscopy of cluster isomerism and cluster dynamics: from carboxylic acid dimers to N₂O nanoparticles, Faraday Discuss. 118 (2001) 331–359. https://doi.org/10.1039/b009312m.

Education

2000

PhD in Physical Chemistry (Dr. rer. nat.)

Institute of Physical Chemistry, University of Göttingen

Thesis: “Ragout-Jet-FTIR-Spektroskopie – Eine neuartige Methode zur Untersuchung der Dynamik von Oligomeren und nanometer-großen Molekülclustern“

Advisors: M. A. Suhm, U. Buck

1997

MS in Chemistry (Dipl.-Chem.)

Institute of Physical Chemistry, University of Paderborn

Thesis: „Beobachtung des Mizellwachstums mit Hilfe zeitaufgelöster Fluoreszenz-Untersuchungen“

Advisors: P. Pollmann, H. Stegemeyer

Work History:

since 09/2022	Senior Scientist \| Head of “Optical Diagnostics” Prof. Deutschmann Karlsruhe Institute of Technology (KIT) Institute of Catalysis Research and Technology (IKFT)
01/2015 - 08/2022	Research Fellow Prof. Suntz & Prof. Deutschmann Karlsruhe Institute of Technology (KIT) Institute for Chemical Technology and Polymer Chemistry (ITCP)
09/2009 – 12/2014	Research Fellow Prof. Bockhorn Karlsruhe Institute of Technology (KIT) Engler-Bunte-Institute (EBI), Combustion Division
10/2005 – 08/2009	Research Fellow Prof. Kleinermanns University of Düsseldorf Institute of Physical Chemistry
10/2004 – 09/2005	Research and Service Technician Radiant Dyes Laser Accessories GmbH
10/2003 – 10/2004	Postdoctoral Fellow (DFG Fellowship) Prof. Kleinermanns University of Düsseldorf Institute of Physical Chemistry
11/2001 – 05/2003	Postdoctoral Fellow (AvH Feodor-Lynen Research Fellowship) Prof. David Nesbitt University of Colorado, BoulderJoint Institute of Laboratory Astrophysics (JILA)
11/2000 – 10/2001	Junior Scientist Prof. Martin Suhm University of Göttingen Institute of Physical Chemistry (IPC)

Honors/Achievements:

2019 Microsoft Professional Program, Data Science Certificate

2003 Postdoctoral Research Fellowship (German Research Foundation)

2001 Feodor-Lynen Research Fellowship (Alexander von Humboldt Foundation)

2001 Richard Zsigmondy Award, University of Göttingen