N. N.

Chief Scientific Officer

Research

Catalytic converters for emission control
Preparation and characterization of heterogeneous catalysts
Kinetic measurements
X-ray absorption spectroscopy

Education

2002 - 2007 Dr. Sc. ETH Zürich

Eidgenössische Technische Hochschule Zürich (ETH Zürich), Switzerland

Department of Chemistry and Applied Biosciences

Thesis: NO_x storage-reduction catalysts. Material aspects, thermal ageing and reactivation

1999 - 2001 M. Sc. Chemistry of Compounds with Biological Activity

West Unversity of Timisoara, Romania

1995 - 1999 B. Sc. Chemistry

West University of Timisoara, Romania

Work History

since 2012 Chief Scientific Officer of the Exhaust Gas Center Karlsruhe

Karlsruhe Institute of Technology

Institute for Chemical Technology and Polymer Chemistry

2011 - 2012 Senior Scientist, Karlsruhe Institute of Technology, Germany

Leader of the Exhaust Gas Aftertreatment Team in the Chemical Technology and Catalysis Group

Institute for Chemical Technology and Polymer Chemistry

2007 - 2011 PostDoc, Paul Scherrer Institute (PSI), Switzerland

Catalysis for Energy Group

Research focus: NO_x removal, soot oxidation, urea hydrolysis and hydrothermal ageing studies

for conventional zeolite- and novel CeO₂-based NH₃-SCR catalysts

Recent Publications

A review on exhaust gas after-treatment of lean-burn natural gas engines – From fundamentals to application
Lott, P.; Casapu, M.; Grunwaldt, J.-D.; Deutschmann, O.
2024. Applied Catalysis B: Environmental, 340, Art.Nr.: 123241. doi:10.1016/j.apcatb.2023.123241

TiO2‐CeOx‐Pt Hollow Nanosphere Catalyst for Low‐Temperature CO Oxidation
Liebertseder, M.; Maliakkal, C. B.; Crone, M.; Nails, G.; Casapu, M.; Grunwaldt, J.-D.; Türk, M.; Kübel, C.; Feldmann, C.
2023. ChemCatChem. doi:10.1002/cctc.202301358

Methane Oxidation over PdO: Towards a Better Understanding of the Influence of the Support Material
Keller, K.; Lott, P.; Tischer, S.; Casapu, M.; Grunwaldt, J.-D.; Deutschmann, O.
2023. ChemCatChem, 15 (11), Art.-Nr.: e202300366. doi:10.1002/cctc.202300366

Identifying the Structure of Supported Metal Catalysts Using Vibrational Fingerprints from Ab Initio Nanoscale Models
Salcedo, A.; Zengel, D.; Maurer, F.; Casapu, M.; Grunwaldt, J.-D.; Michel, C.; Loffreda, D.
2023. Small. doi:10.1002/smll.202300945

Understanding the multiple interactions in vanadium-based SCR catalysts during simultaneous NO $_{x}$ and soot abatement
Zheng, L.; Casapu, M.; Grunwaldt, J.-D.
2022. Catalysis Science & Technology, 12 (12), 3969–3981. doi:10.1039/d2cy00432a

Direct Observation of Reactant, Intermediate, and Product Species for Nitrogen Oxide-Selective Catalytic Reduction on Cu-SSZ-13 Using In Situ Soft X-ray Spectroscopy
Seitz, L. C.; Doronkin, D. E.; Hauschild, D.; Casapu, M.; Zengel, D.; Zimina, A.; Kreikemeyer-Lorenzo, D.; Blum, M.; Yang, W.; Grunwaldt, J.-D.; Heske, C.; Weinhardt, L.
2022. The Journal of Physical Chemistry C, 126 (49), 20998–21009. doi:10.1021/acs.jpcc.2c04736

Dynamics of the Reversible Inhibition during Methane Oxidation on Bimetallic Pd‐Pt Catalysts Studied by Modulation‐Excitation XAS and DRIFTS
Boubnov, A.; Gremminger, A.; Casapu, M.; Deutschmann, O.; Grunwaldt, J.-D.
2022. ChemCatChem, 14 (22), e202200573. doi:10.1002/cctc.202200573

Dynamic Structural Evolution of Ceria-Supported Pt Particles: A Thorough Spectroscopic Study
Wang, J.; Sauter, E.; Nefedov, A.; Heißler, S.; Maurer, F.; Casapu, M.; Grunwaldt, J.-D.; Wang, Y.; Wöll, C.
2022. The Journal of Physical Chemistry C, 126 (21), 9051–9058. doi:10.1021/acs.jpcc.2c02420

Surface Noble Metal Concentration on Ceria as a Key Descriptor for Efficient Catalytic CO Oxidation
Maurer, F.; Beck, A.; Jelic, J.; Wang, W.; Mangold, S.; Stehle, M.; Wang, D.; Dolcet, P.; Gänzler, A. M.; Kübel, C.; Studt, F.; Casapu, M.; Grunwaldt, J.-D.
2022. ACS catalysis, 12, 2473–2486. doi:10.1021/acscatal.1c04565

Present Challenges in Catalytic Emission Control for Internal Combustion Engines
Doronkin, D. E.; Casapu, M.
2021. Catalysts, 11 (9), Art.-Nr. 1019. doi:10.3390/catal11091019

Impact of gas phase reactions and catalyst poisons on the NH₃-SCR activity of a V₂O₅-WO₃/TiO₂ catalyst at pre-turbine position
Zengel, D.; Stehle, M.; Deutschmann, O.; Casapu, M.; Grunwaldt, J.-D.
2021. Applied catalysis / B, 288, Article no: 119991. doi:10.1016/j.apcatb.2021.119991

Insights into the Structural Dynamics of Pt/CeO $_{2}$ Single-Site Catalysts during CO Oxidation
Dolcet, P.; Maurer, F.; Casapu, M.; Grunwaldt, J.-D.
2021. Catalysts, 11 (5), Art.-Nr. 617. doi:10.3390/catal11050617

The Impact of Pressure and Hydrocarbons on NOx Abatement over Cu- and Fe-Zeolites at Pre-Turbocharger Position
Zengel, D.; Barth, S.; Casapu, M.; Grunwaldt, J.-D.
2021. Catalysts, 11 (3), 336. doi:10.3390/catal11030336

Versatile and high temperature spectroscopic cell for operando fluorescence and transmission x-ray absorption spectroscopic studies of heterogeneous catalysts
Eggart, D.; Zimina, A.; Cavusoglu, G.; Casapu, M.; Doronkin, D. E.; Lomachenko, K. A.; Grunwaldt, J.-D.
2021. Review of scientific instruments, 92 (2), Art.-Nr. 023106. doi:10.1063/5.0038428

NaCl-template-based synthesis of TiO₂-Pd/Pt hollow nanospheres for H₂O₂ direct synthesis and CO oxidation
Liebertseder, M.; Wang, D.; Cavusoglu, G.; Casapu, M.; Wang, S.; Behrens, S.; Kübel, C.; Grunwaldt, J.-D.; Feldmann, C.
2021. Nanoscale, 13 (3), 2005–2011. doi:10.1039/d0nr08871d

Catalytic co oxidation and H $_{2}$ O $_{2}$ direct synthesis over pd and pt-impregnated titania nanotubes
Warmuth, L.; Nails, G.; Casapu, M.; Wang, S.; Behrens, S.; Grunwaldt, J.-D.; Feldmann, C.
2021. Catalysts, 11 (8), 949. doi:10.3390/catal11080949

Spatiotemporal Investigation of the Temperature and Structure of a Pt/CeO₂ Oxidation Catalyst for CO and Hydrocarbon Oxidation during Pulse Activation
Maurer, F.; Gänzler, A.; Lott, P.; Betz, B.; Votsmeier, M.; Loridant, S.; Vernoux, P.; Murzin, V.; Bornmann, B.; Frahm, R.; Deutschmann, O.; Casapu, M.; Grunwaldt, J.-D.
2021. Industrial & engineering chemistry research, 60 (18), 6662–6675. doi:10.1021/acs.iecr.0c05798

Hydrocarbon and soot oxidation over cerium and iron doped vanadium SCR catalysts
Casapu, M.; Zheng, L.; Zimina, A.; Grunwaldt, J.-D.
2020. ChemCatChem, 12 (24), 6272–6284. doi:10.1002/cctc.202001314

Applications of Hard X-ray Spectroscopy in Energy-Related and Environmental Catalysis
Doronkin, D. E.; Casapu, M.; Grunwaldt, J.-D.
2020. Synchrotron radiation news, 33 (5), 11–17. doi:10.1080/08940886.2020.1812353

Understanding Sulfur Poisoning of Bimetallic Pd-Pt Methane Oxidation Catalysts and their Regeneration
Lott, P.; Eck, M.; Doronkin, D. E.; Zimina, A.; Tischer, S.; Popescu, R.; Belin, S.; Briois, V.; Casapu, M.; Grunwaldt, J.-D.; Deutschmann, O.
2020. Applied catalysis / B, 278, Art.Nr.: 119244. doi:10.1016/j.apcatb.2020.119244

Operando X-ray Absorption Spectroscopy Study during Conditioning of Pt-Based Catalysts and Its Implications for CO Oxidation
Gänzler, A. M.; Betz, B.; Baier-Stegmaier, S.; Belin, S.; Briois, V.; Votsmeier, M.; Casapu, M.
2020. The journal of physical chemistry <Washington, DC> / C, 124 (37), 20090–20100. doi:10.1021/acs.jpcc.0c04740

Emission of Toxic HCN During NOx Removal by Ammonia SCR in the Exhaust of Lean-Burn Natural Gas Engines
Zengel, D.; Koch, P.; Torkashvand, B.; Grunwaldt, J.-D.; Casapu, M.; Deutschmann, O.
2020. Angewandte Chemie / International edition, 59 (34), 14423–14428. doi:10.1002/anie.202003670

Freisetzung von toxischem HCN bei der Stickoxidreduktion mittels NH₃‐SCR in mager betriebenen Erdgasmotoren
Zengel, D.; Koch, P.; Torkashvand, B.; Grunwaldt, J.-D.; Casapu, M.; Deutschmann, O.
2020. Angewandte Chemie, 132 (34), 14530–14535. doi:10.1002/ange.202003670

Tracking the formation, fate and consequence for catalytic activity of Pt single sites on CeO2
Maurer, F.; Jelic, J.; Wang, J.; Gänzler, A.; Dolcet, P.; Wöll, C.; Wang, Y.; Studt, F.; Casapu, M.; Grunwaldt, J.-D.
2020. Nature catalysis, 3, 824–833. doi:10.1038/s41929-020-00508-7

Exploiting the dynamic properties of Pt on ceria for low-temperature CO oxidation
Ferré, G.; Aouine, M.; Bosselet, F.; Burel, L.; Cadete Santos Aires, F. J.; Geantet, C.; Ntais, S.; Maurer, F.; Casapu, M.; Grunwaldt, J.-D.; Epicier, T.; Loridant, S.; Vernoux, P.
2020. Catalysis science & technology, 10 (12), 3904–3917. doi:10.1039/d0cy00732c

PGM based catalysts for exhaust-gas after-treatment under typical diesel, gasoline and gas engine conditions with focus on methane and formaldehyde oxidation
Gremminger, A.; Pihl, J.; Casapu, M.; Grunwaldt, J.-D.; Toops, T. J.; Deutschmann, O.
2020. Applied catalysis / B, 265, Article No.118571. doi:10.1016/j.apcatb.2019.118571

Unravelling the Different Reaction Pathways for Low Temperature CO Oxidation on Pt/CeO2 and Pt/Al2O3 by Spatially Resolved Structure–Activity Correlations
Gänzler, A. M.; Casapu, M.; Doronkin, D. E.; Maurer, F.; Lott, P.; Glatzel, P.; Votsmeier, M.; Deutschmann, O.; Grunwaldt, J.-D.
2019. The journal of physical chemistry letters, 10 (24), 7698–7705. doi:10.1021/acs.jpclett.9b02768

NH $_{3}$ -SCR over V-W/TiO $_{2}$ Investigated by Operando X-ray Absorption and Emission Spectroscopy
Doronkin, D. E.; Benzi, F.; Zheng, L.; Sharapa, D. I.; Amidani, L.; Studt, F.; Roesky, P. W.; Casapu, M.; Deutschmann, O.; Grunwaldt, J.-D.
2019. The journal of physical chemistry <Washington, DC> / C, 123 (23), 14338–14349. doi:10.1021/acs.jpcc.9b00804

Impact of Preparation Method and Hydrothermal Aging on Particle Size Distribution of Pt/γ-Al $_{2}$ O $_{3}$ and Its Performance in CO and NO Oxidation
Ogel, E.; Casapu, M.; Doronkin, D. E.; Popescu, R.; Störmer, H.; Mechler, C.; Marzun, G.; Barcikowski, S.; Türk, M.; Grunwaldt, J.-D.
2019. The journal of physical chemistry <Washington, DC> / C, 123 (9), 5433–5446. doi:10.1021/acs.jpcc.8b11065

Oxidation State and Dielectric Properties of Ceria-Based Catalysts by Complementary Microwave Cavity Perturbation and X-Ray Absorption Spectroscopy Measurements
Steiner, C.; Gänzler, A. M.; Zehentbauer, M.; Hagen, G.; Casapu, M.; Müller, S.; Grunwaldt, J.-D.; Moos, R.
2019. Topics in catalysis, 62 (1-4), 227–236. doi:10.1007/s11244-018-1110-3

Selective Catalytic Reduction of NOx with Ammonia and Hydrocarbon Oxidation Over V2O5–MoO3/TiO2 and V2O5–WO3/TiO2 SCR Catalysts
Zheng, L.; Casapu, M.; Stehle, M.; Deutschmann, O.; Grunwaldt, J.-D.
2019. Topics in catalysis, 62 (1-4), 129–139. doi:10.1007/s11244-018-1097-9

Insight into the Nature of Active Species of Pt/Al2O3 Catalysts for low Temperature NH3 Oxidation
Svintsitskiy, D. A.; Kibis, L. S.; Stadnichenko, A. I.; Slavinskaya, E. M.; Romanenko, A. V.; Fedorova, E. A.; Stonkus, O. A.; Doronkin, D. E.; Marchuk, V.; Zimina, A.; Casapu, M.; Grunwaldt, J.-D.; Boronin, A. I.
2019. ChemCatChem, cctc.201901719. doi:10.1002/cctc.201901719

The Effect of Prereduction on the Performance of Pd/Al₂O₃ and Pd/CeO₂ Catalysts during Methane Oxidation
Lott, P.; Dolcet, P.; Casapu, M.; Grunwaldt, J.-D.; Deutschmann, O.
2019. Industrial & engineering chemistry research, 58 (28), 12561–12570. doi:10.1021/acs.iecr.9b01267

The dynamic nature of Cu sites in Cu-SSZ-13 and the origin of the seagull NOx conversion profile during NH₃-SCR
Fahami, A. R.; Günter, T.; Doronkin, D. E.; Casapu, M.; Zengel, D.; Vuong, T. H.; Simon, M.; Breher, F.; Kucherov, A. V.; Brückner, A.; Grunwaldt, J.-D.
2019. Reaction chemistry & engineering, 4 (6), 1000–1018. doi:10.1039/c8re00290h

Tuning the Pt/CeO Interface by in Situ Variation of the Pt Particle Size
Gänzler, A. M.; Casapu, M.; Maurer, F.; Störmer, H.; Gerthsen, D.; Ferré, G.; Vernoux, P.; Bornmann, B.; Frahm, R.; Murzin, V.; Nachtegaal, M.; Votsmeier, M.; Grunwaldt, J.-D.
2018. ACS catalysis, 8 (6), 4800–4811. doi:10.1021/acscatal.8b00330

Regeneration of Sulfur Poisoned Pd–Pt/CeO2–ZrO2–Y2O3–La2O3 and Pd–Pt/Al2O3 Methane Oxidation Catalysts
Lott, P.; Eck, M.; Doronkin, D. E.; Popescu, R.; Casapu, M.; Grunwaldt, J.-D.; Deutschmann, O.
2018. Topics in catalysis, 62 (164–171). doi:10.1007/s11244-018-1121-0

Tuning the Structure of Platinum Particles on Ceria In Situ for Enhancing the Catalytic Performance of Exhaust Gas Catalysts
Gänzler, A. M.; Casapu, M.; Vernoux, P.; Loridant, S.; CadeteSantosAires, F. J.; Epicier, T.; Betz, B.; Hoyer, R.; Grunwaldt, J.-D.
2017. Angewandte Chemie / International edition, 56 (42), 13078–13082. doi:10.1002/anie.201707842

Sulfur poisoning and regeneration of bimetallic Pd-Pt methane oxidation catalysts
Gremminger, A.; Lott, P.; Merts, M.; Casapu, M.; Grunwaldt, J.-D.; Deutschmann, O.
2017. Applied catalysis / B, 218, 833–843. doi:10.1016/j.apcatb.2017.06.048

Origin of the Normal and Inverse Hysteresis Behavior during CO Oxidation over Pt/Al₂O₃
Casapu, M.; Fischer, A.; Gänzler, A. M.; Popescu, R.; Crone, M.; Gerthsen, D.; Türk, M.; Grunwaldt, J.-D.
2017. ACS catalysis, 7 (1), 343–355. doi:10.1021/acscatal.6b02709

Comparison of the Catalytic Performance and Carbon Monoxide Sensing Behavior of Pd-SnO₂ Core@Shell Nanocomposites
Ogel, E.; Müller, S. A.; Sackmann, A.; Gyger, F.; Bockstaller, P.; Brose, E.; Casapu, M.; Schöttner, L.; Gerthsen, D.; Feldmann, C.; Grunwaldt, J.-D.
2017. ChemCatChem, 9 (3), 407–413. doi:10.1002/cctc.201601132

HERFD-XANES and XES as complementary operando tools for monitoring the structure of Cu-based zeolite catalysts during NOx-removal by ammonia SCR
Günter, T.; Doronkin, D. E.; Carvalho, H. W. P.; Casapu, M.; Grunwaldt, J.-D.
2016. Journal of physics / Conference Series, 712 (1), Art. Nr.: 012071. doi:10.1088/1742-6596/712/1/012071

Using combined XAS/DRIFTS to study CO/NO Oxidation over Pt/Al2O3 catalysts
Gänzler, A. M.; Lichtenberg, H.; Frenkel, A. I.; Casapu, M.; Boubnov, A.; Wang, D.; Grunwaldt, J.-D.
2016. Journal of physics / Conference Series, 712 (1), Art. Nr.: 012045. doi:10.1088/1742-6596/712/1/012045

The SCR of NOx with NH3 Examined by Novel X-ray Emission and X-ray Absorption Methods
Günter, T.; Doronkin, D. E.; Boubnov, A.; Carvalho, H. W. P.; Casapu, M.; Grunwaldt, J.-D.
2016. Topics in catalysis, 59 (10-12), 866–874. doi:10.1007/s11244-016-0561-7

Cu-SSZ-13 as pre-turbine NOx-removal-catalyst: Impact of pressure and catalyst poisons
Günter, T.; Pesek, J.; Schäfer, K.; Bertótiné Abai, A.; Casapu, M.; Deutschmann, O.; Grunwaldt, J.-D.
2016. Applied catalysis / B, 198, 548–557. doi:10.1016/j.apcatb.2016.06.005

Soot and hydrocarbon oxidation over vanadia-based SCR catalysts
Japke, E.; Casapu, M.; Trouillet, V.; Deutschmann, O.; Grunwaldt, J.-D.
2015. Catalysis today, 258 (2), 461–469. doi:10.1016/j.cattod.2015.04.020

Study on the hydrothermal and SO₂ stability of Al₂O₃-supported manganese and iron oxide catalysts for lean CO oxidation
Tepluchin, M.; Kureti, S.; Casapu, M.; Ogel, E.; Mangold, S.; Grunwaldt, J. D.
2015. Catalysis today, 258, 498–506. doi:10.1016/j.cattod.2015.01.010

Structural snapshots of the SCR reaction mechanism on Cu-SSZ-13
Günter, T.; Carvalho, H. W. P.; Doronkin, D. E.; Sheppard, T.; Glatzel, P.; Atkins, A. J.; Rudolph, J.; Jacob, C. R.; Casapu, M.; Grunwaldt, J. D.
2015. Chemical communications, 51, 9227–9230. doi:10.1039/C5CC01758K

Operando spatially and time-resolved X-ray absorption spectroscopy and infrared thermography during oscillatory CO oxidation
Gänzler, A. M.; Casapu, M.; Boubnov, A.; Müller, O.; Conrad, S.; Lichtenberg, H.; Frahm, R.; Grunwaldt, J. D.
2015. Journal of catalysis, 328, 216–224. doi:10.1016/j.jcat.2015.01.002

Aging of a Pt/Al₂O₃ exhaust gas catalyst monitored by quasi in situ X-ray micro computed tomography
Hofmann, G.; Rochet, A.; Ogel, E.; Casapu, M.; Ritter, S.; Ogurreck, M.; Grunwaldt, J.-D.
2015. RSC Advances, 5 (9), 6893–6905. doi:10.1039/C4RA14007A

Influence of single- and double-flame spray pyrolysis on the structure of MnOₓ/γ-Al₂O₃ and FeOₓ/γ-Al₂O₃ catalysts and their behaviour in CO removal under lean exhaust gas conditions
Tepluchin, M.; Pham, D. K.; Casapu, M.; Mädler, L.; Kureti, S.; Grunwaldt, J.-D.
2015. Catalysis science & technology, 5 (1), 455–464. doi:10.1039/C4CY00727A

Ageing effects on exhaust gas catalysts: Microscopic changes captured by x-ray tomography
Hofmann, G.; Rochet, A.; Baier, S.; Casapu, M.; Ritter, S.; Wilde, F.; Ogurreck, M.; Beckmann, F.; Grunwaldt, J.-D.
2014. Journal of physics / Conference Series, 499 (1), 012017/1–11. doi:10.1088/1742-6596/499/1/012017

Fe and Mn-Based catalysts supported on γ-Al₂O₃ for CO oxidation under O₂-rich conditions
Tepluchin, M.; Casapu, M.; Boubnov, A.; Lichtenberg, H.; Wang, D.; Kureti, S.; Grunwaldt, J.-D.
2014. ChemCatChem, 6 (6), 1763–1773. doi:10.1002/cctc.201301040

Operando spatially- and time-resolved XAS study on zeolite catalysts for selective catalytic reduction of NOₓ by NH₃
Doronkin, D. E.; Casapu, M.; Günter, T.; Müller, O.; Frahm, R.; Grunwaldt, J. D.
2014. The journal of physical chemistry <Washington, DC> / C, 118, 10204–10212. doi:10.1021/jp5028433

Oscillatory CO oxidation over Pt/Al₂O₃ catalysts studied by in situ XAS and DRIFTS
Boubnov, A.; Gänzler, A.; Conrad, S.; Casapu, M.; Grunwaldt, J.-D.
2013. Topics in catalysis, 56 (1-8), 333–338. doi:10.1007/s11244-013-9976-6

Potential and limitations of natural chabazite for selective catalytic reduction of NOₓ with NH₃
Günter, T.; Casapu, M.; Doronkin, D.; Mangold, S.; Trouillet, V.; Augenstein, T.; Grunwaldt, J.-D.
2013. Chemie - Ingenieur - Technik, 85 (5), 632–641. doi:10.1002/cite.201200182