JOURNAL  ARTICLES

• Das, S.; Stuckelberger, M. E.; Pottbacker, J.; Jakobtorweihen, S.; Horn, R.; Sheppard, T. L. Quantitative chemical mapping of Pt/Rh gauze catalysts for ammonia oxidation using resonant X-ray tomography. J. Phys. Chem. C  2024, 128, 5053-5063. doi.org/10.1021/acs.jpcc.4c00041.

• Das, S.; Kahnt, M.; Valen, Y. v.; Bergh, T.; Blomberg, S.; Lyubomirskiy, M.; Schroer, C. G.; Venvik, H. J.; Sheppard, T. L. Restructuring of Ag catalysts for methanol to formaldehyde conversion studied using in situ X-ray ptychography and electron microscopy. Catal. Sci. Technol. 2024, 14, 5885-5898. doi.org/10.1039/D4CY00770K 

• Lazar, I.; Mehta, B.; Bertschová, V.; Malladi, S. B. A.; Ren, Z.; Das, S.; Hagemann, J.; Falkenberg, G.; Frisk, K.; Mikkelsen, A.; Nyborg, N. In situ Imaging of Precipitate Formation in Additively Manufactured Al-Alloys by Scanning X-ray Fluorescence. European Journal of Materials 2024, 4, 2328242. doi.org/10.1080/26889277.2024.2328242.

• Das, S.; Pashminehazar, R.; Sharma, S.; Weber, S.; Sheppard, T. L. New Dimensions in Catalysis Research with Hard X-ray Tomography. Chem. Ing. Tech. 2022, 94, 1591-1610. doi.org/10.1002/cite.202200082.

ORCID iD:   orcid.org/0000-0002-5025-1663

CONFERENCES

ORAL  PRESENTATIONS

• S. Das, M, Vasyl, D. F. Sanchez, D. E. Doronkin, J.-D. Grunwaldt, T. L. Sheppard, "Real-time chemical gradient mapping in ammonia slip catalysts using operando spectrotomography", 18th International Congress on Catalysis, Lyon, France (2024). 

• S. Das, M. E. Stuckelberger, J. Pottbacker, S. Jakobtorweihen, R. Horn, T. L. Sheppard, "Resonant X-ray Tomography Quantifies the Ammonia Oxidation-induced Degradation of Pt/Rh Gauze Catalysts ", 57th Meeting of the German Catalysis Society, Weimar, Germany (2024).

• S. Das, T. L. Sheppard, "In situ Sample Environments for Hard X-ray Imaging of Catalysts and Functional Materials", NanoMat Science Day, Hamburg, Germany (2023) - invited talk.

• S. Das, M, Vasyl, D. F. Sanchez, D. E. Doronkin, J.-D. Grunwaldt, T. L. Sheppard, "Operando XAS-tomography Reveals Chemical Gradients in Pt/Al2O3 and Cu-SSZ-13 Emissions Control Catalysts", Operando VII, Grindelwald, Switzerland (2023).

• S. Das, M, Vasyl, S. Sharma, D. F. Sanchez, D. E. Doronkin, J.-D. Grunwaldt, T. L. Sheppard, "Chemical Gradients in Pt/Al2O3 and Cu-SSZ-13 Emission Control Catalysts Revealed by Operando XAS-tomography", MODEGAT VII, Bad Herrenalb, Germany (2022).

• S. Das, M. E. Stuckelberger, J. Pottbacker, S. Jakobtorweihen, R. Horn, T. L. Sheppard, "Multimodal hard X-ray tomography to study degradation and composition of Pt/Rh gauze catalysts during NH3 oxidation", 5th Conference for Research with Synchrotron Radiation, Neutrons and Ion Beams at Large Facilities, Berlin, Germany (2022).

• S.Weber, S. Das, S. Sharma, T. L. Sheppard, "New Horizons for Catalyst Characterisation using Hard X-ray Tomography", 5th Conference for Research with Synchrotron Radiation, Neutrons and Ion Beams at Large Facilities, Berlin, Germany (2022).

• S. Das, M. E. Stuckelberger, J. Pottbacker, S. Jakobtorweihen, R. Horn, T. L. Sheppard, "Multimodal hard X-ray tomography to study chemical composition of Pt/Rh gauze catalysts for NH3 oxidation", 18th International Conference on X-Ray Absorption Fine Structure, Sydney, Australia (2022).

• S. Das, "Using hard X-rays for characterization of heterogenous catalytic systems using time-, energy- and spatially-resolved techniques", CRC 1441 Summer School - DESY, Hamburg, Germany (2022).

POSTERS

• S. Das, M. E. Stuckelberger, J. Pottbacker, S. Jakobtorweihen, R. Horn, T. L. Sheppard, "Hard X-ray tomography reveals structural degradation and chemical composition of Pt/Rh gauze catalysts for NH3 oxidation", 15th European Congress on Catalysis, Prague, Czech Republic (2023).

• A. Schropp, M. Seyrich, D. Brückner, F. Wittwer, S. Das, T. L. Sheppard, C. G. Schroer, "In-situ X-ray Ptychography", 26th Congress and General Assembly of the International Union of Crystallography (IUCr 2023), Melbourne, Australia (2023).

• S. Das, M. E. Stuckelberger, J. Pottbacker, S. Jakobtorweihen, R. Horn, T. L. Sheppard, "Insights into physico-chemical properties of Pt/Rh gauze catalysts during industrial ammonia oxidation using hard X-ray microscopy", 56th Meeting of the German Catalysis Society, Weimar, Germany (2023).

• S. Das, M. E. Stuckelberger, J. Pottbacker, S. Jakobtorweihen, R. Horn, T. L. Sheppard, "Insights into physico-chemical properties of Pt/Rh gauze catalysts during industrial ammonia oxidation using hard X-ray microscopy", DESY User Meeting, Hamburg, Germany (2023).

• S. Sharma, S. Das, D. F. Sanchez, M. Vasyl, D. E. Doronkin, T. Delrieux, J.-D. Grunwaldt, T. L. Sheppard, "Hard X-ray tomography for 3D spatially-resolved multiscale and multimodal characterization of non-model catalysts", 5th Conference for Research with Synchrotron Radiation, Neutrons and Ion Beams at Large Facilities, Berlin, Germany (2022).

• S. Das, M, Vasyl, S. Sharma, D. F. Sanchez, D. E. Doronkin, J.-D. Grunwaldt, T. L. Sheppard, "Operando hard X-ray spectrotomography of Pt/Al2O3 and Cu-SSZ-13 zeolite emissions control catalysts",55th Meeting of the German Catalysis Society, Weimar, Germany (2022).

• S. Das, M. E. Stuckelberger, J. Pottbacker, S. Jakobtorweihen, R. Horn, T. L. Sheppard, "Revealing composition and stability of Pt/Rh gauze catalysts for NH3 oxidation using multimodal hard X-ray tomography", 19th Nordic Symposium on Catalysis, Espoo, Finland (2022).

• S. Sharma, S. Das, M. Vasyl, D. E. Doronkin, D. F. Sanchez, J.-D. Grunwaldt, T. L. Sheppard, "Spatially-resolved Insights into Structured Catalysts with Operando X-ray Spectrotomography", International CataLysis Networking Conference 2022, Berlin, Germany (2022).

• S. Das, M. E. Stuckelberger, J. Pottbacker, S. Jakobtorweihen, R. Horn, T. L. Sheppard, "Multimodal X-ray microscopy and tomography of Pt/Rh catalyst gauze degradation", 14th SRI 2021, Online Event (2022).

• S. Das, J. T. Roeh, M. Lyubomirskiy, V. Galbierz, R. Doehrmann, R. Marx, A. Schropp, C. G. Schroer, T. L. Sheppard, "2D in situ nanoreactor for catalyst characterization using hard X-rays and electron microscopy", DESY User Meeting, Hamburg, Germany (2022).

• S. Das, M. E. Stuckelberger, J. Pottbacker, S. Jakobtorweihen, R. Horn, T. L. Sheppard, "Structural and Compositional Analysis of Pt/Rh Gauze for Ammonia Oxidation", HERCULES European School - ESRF, Online Event (2021).

• S. Das, C. Muhich, "Study of Paired Charge Compensating Dopants in Ceria for Solar Thermochemical Splitting of H2O and CO2", WE18 - Society of Women Engineers, Minneapolis, Minnesota, United States (2018).