Dr. Sharon Mitchell
Scientist

ETH Hönggerberg
HCI E129
Vladimir-Prelog-Weg 1
CH-8093 Zurich

tel: +41 4463 23123

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    Structural analysis of catalytic materials

    My research focuses on the advanced characterization of structure-property relations in heterogeneous catalysts over relevant time and length scales. Microscopy techniques play a central role and an important achievement has been the development of integrated approaches to visualize technical zeolite catalysts, an area that I currently pursue with Bego and Antonio. As microscopy responsible, I regularly team up with other group members and also staff at the Scientific Center of Optical and Electron Microscopy of ETH Zurich on the visualization of zeolites, organic-inorganic hybrids, mixed metal oxides, and other novel catalysts. Similarly, I collaborate with Robbie and the group of Dr. Paolo Crivelli (D-Phys) to explore the potential of positron annihilation lifetime spectroscopy and with Micromeritics to develop improved gas sorption methods for the analysis of complex porous materials. Together with an industrial partner, Ferdy and I are using this knowledge to develop zeolite-based catalysts for vitamins synthesis. An exciting new area concerns the design of single site catalysts for hydrogenations in which I work with EvgeniyaDavide, and Zupeng.

    2013-now Scientist in the group of Prof. Pérez-Ramírez, ETH Zürich, Switzerland
    2010-2013 Post-doctoral researcher in the group of Prof. Pérez-Ramírez, ETH Zurich, Switzerland
    2009-2010 Post doctoral researcher in the group of Prof. Pérez-Ramírez, ICIQ, Spain
    2005-2009 PhD studentship in the group of Prof. Jones, Cambridge University, England
    2000-2004 MSci and BSc studies in Natural Sciences, Cambridge University, England
    • Single atom catalysis
      S. Mitchell, J. M. Thomas, J. Pérez-Ramírez
      Catal. Sci. Technol. 2017, in press (doi:10.1039/c7cy90090b)
    • Semi-hydrogenation of acetylene on indium oxide: proposed single ensemble catalysis
      D. Albani, M. Capdevila-Cortada, G. Vilé, S. Mitchell, O. Martin, N. López, J. Pérez-Ramírez
      Angew. Chem. Int. Ed. 2017, 56, 10755-10760 (doi:10.1002/anie.201704999)
      Angew. Chem. 2017, 129, 10895-10900 (doi:10.1002/ange.201704999)
    • Tailoring the framework composition of carbon nitride to improve the catalytic efficiency of the stabilised palladium atoms
      E. Vorobyeva, Z. Chen, S. Mitchell, R. K. Leary, P. Midgley, J. M. Thomas, R. Hauert, E. Fako, N. López, J. Pérez-Ramírez
      J. Mater. Chem. A 2017, 5, 16393-16403 (doi:10.1039/C7TA04607C)
    • Visualising compositional heterogeneity during the scale up of multicomponent zeolite bodies
      A.J. Martin, S. Mitchell, K. Kunze, K.C. Weston, J. Pérez-Ramírez
      Mater. Horiz. 2017, 4, 857-861 (doi:10.1039/C7MH00088J, inside front cover)
    • Europium oxybromide catalysts for efficient bromine looping in natural gas valorization
      V. Paunović, R. Lin, M. Scharfe, A.P. Amrute, S. Mitchell, R. Hauert, J. Pérez-Ramírez
      Angew. Chem. Int. Ed. 2017, 56, 9791-9795 (doi:10.1002/anie.201704406)
      Angew. Chem. 2017, 129, 9923-9927 (doi:10.1002/ange.201704406)
    • Design of a technical Mg-Al mixed oxide catalyst for the continuous manufacture of glycerol carbonate
      G.M. Lari, A.B.L. de Moura, L. Weimann, S. Mitchell, C. Mondelli, J. Pérez-Ramírez
      J. Mater. Chem. A 2017, 5, 16200-16211 (doi:10.1039/C7TA02061A)
    • Mapping the birth and evolution of pores upon thermal activation of layered hydroxides
      R. Warringham, S. Mitchell, R. Murty, R. Schaeublin, P. Crivelli, J. Kenvin, J. Pérez-Ramírez
      Chem. Mater. 2017, 29, 4052-4062 (doi:10.1021/acs.chemmater.7b00734, front cover)
    • Pore topology effects in positron annihilation spectroscopy of zeolites
      A. Zubiaga, R. Warringham, S. Mitchell, L. Gerchow, D. Cooke, P. Crivelli, J. Pérez-Ramírez
      ChemPhysChem 2017, 18, 470-479 (doi:10.1002/cphc.201601258, front cover)
    • Stabilization of single metal atoms on graphitic carbon nitride
      Z. Chen, S. Mitchell, E. Vorobyeva, R.K. Leary, R. Hauert, T. Furnival, Q.M. Ramasse, J.M. Thomas, P.A. Midgley, D. Dontsova, M. Antonietti, S. Pogodin, N. López, J. Pérez-Ramírez
      Adv. Funct. Mater. 2017, 27, 1605785 (doi:10.1002/adfm.201605785, frontispiece)
    • Interfacial acidity in ligand-modified ruthenium nanoparticles boosts the performance for the continuous hydrogenation of levulinic acid to gamma-valerolactone 
      D. Albani, Q. Li, G. Vilé, S. Mitchell, N. Almora-Barrios, P.T. Witte, N. López, J. Pérez-Ramírez
      Green Chem. 2017, 19, 2361-2370 (doi:10.1039/C6GC02586B, front cover)
    • Engineering of ZSM-5 zeolite crystals for enhanced lifetime in the production of light olefins via 2-methyl-2-butene cracking
      S. Mitchell, M. Boltz, J. Liu, J. Pérez-Ramírez
      Catal. Sci. Technol. 2017, 7, 64-74 (doi:10.1039/C6CY01009A, inside front cover, highlighted article)
    • Lanthanide compounds as catalysts for the one-step synthesis of vinyl chloride from ethylene
      M. Scharfe, P.A. Lira-Parada, A.P. Amrute, S. Mitchell, J. Pérez-Ramírez
      J. Catal. 2016, 344, 524-534 (doi:10.1016/j.jcat.2016.10.026)
    • Insights into the mechanism of zeolite detemplation by positron annihilation lifetime spectroscopy
      R. Warringham, L. Gerchow, A. Zubiaga, D. Cooke, P. Crivelli, S. Mitchell, J. Pérez-Ramírez
      J. Phys. Chem. C 2016, 120, 25451-25461 (doi:10.1021/acs.jpcc.6b08931)
    • Structuring hybrid palladium nanoparticles in metallic monolithic reactors for continuous-flow three-phase alkyne hydrogenation
      D. Albani, G. Vilé, M.A. Beltran Toro, R. Kaufmann, S. Mitchell, J. Pérez-Ramírez
      React. Chem. Eng. 2016, 1, 454-462 (doi:10.1039/c6re00114a)
    • Mechanochemically activated CaO-based MgO-stabilized CO2 sorbents: Highly effective materials prepared via a scalable technique
      A. Kurlov, M. Broda, D. Hosseini, S. Mitchell, J. Pérez-Ramírez, C.R. Müller
      ChemSusChem 2016, 9, 2380-2390 (doi:10.1002/cssc.201600510)
    • Structural analysis of IPC zeolites and related materials using positron annihilation spectroscopy and high-resolution argon adsorption
      J. Jagiello, M. Sterling, P. Eliášová, M. Opanasenko, A. Zukal, R.E. Morris, M. Navaro, Alvaro Mayoral, P. Crivelli, R. Warringham, S. Mitchell, J. Pérez-Ramírez, J. Čejka
      Phys. Chem. Chem. Phys. 2016, 18, 15269-15277 (doi:10.1039/c6cp01950a)
    • Quantifying the complex pore architecture of hierarchical faujasite zeolites and the impact on diffusion
      J. Kenvin, S. Mitchell, M. Sterling, R. Warringham, T. C. Keller, P. Crivelli, J. Jagiello, J. Pérez-Ramírez
      Adv. Funct. Mater. 2016, 26, 5621-5630 (doi:10.1002/adfm.201601748)
    • Analysis of pore connectivity in hierarchical zeolites by positron annihilation lifetime spectroscopy: Impact of implantation profile
      A. Zubiaga, R. Warringham, M. Boltz, D. Cooke, P. Crivelli, D. Gidley, J. Pérez-Ramírez, S. Mitchell
      Phys. Chem. Chem. Phys. 2016, 18, 9211-9219 (doi:10.1039/C6CP00408C)
    • Indium oxide as a superior catalyst for methanol synthesis via CO2 hydrogenation
      O. Martin, A.J. Martín, C. Mondelli, S. Mitchell, T.F. Segawa, R. Hauert, C. Drouilly, D. Curulla-Ferré, J. Pérez-Ramírez
      Angew. Chem. Int. Ed. 2016, 55, 6261-6265 (doi:10.1002/anie.201600943, front cover, highlighted in C&EN)
      Angew. Chem. 2016, 128, 6369-6373 (doi:10.1002/ange.201600943)
    • Synergistic effects in silver-indium electrocatalysts for carbon dioxide reduction
      G.O. Larrazábal, A.J. Martín, S. Mitchell, R. Hauert, J. Pérez-Ramírez
      J. Catal. 2016, 343, 266-277 (doi:10.1016/j.jcat.2015.12.014)
    • Ligand ordering determines the catalytic response of hybrid palladium nanoparticles in hydrogenation
      D. Albani, G. Vilé, S. Mitchell, P.T. Witte, N. Almora-Barrios, R. Verel, N. López, J. Pérez-Ramírez
      Catal. Sci. Technol. 2016, 6, 1621-1631 (doi:10.1039/C5CY01921D)
    • Deoxygenation of bio-oil over solid base catalysts: From model to realistic feeds
      B. Puértolas, T. Keller, S. Mitchell, J. Pérez-Ramírez
      Appl. Catal., B 2016, 184, 77-86 (doi:10.1016/j.apcatb.2015.11.017)
    • Deactivation mechanisms of tin-zeolites in biomass conversions
      G.M. Lari, P.Y. Dapsens, D. Scholz, S. Mitchell, C. Mondelli, J. Pérez-Ramírez
      Green Chem. 2016, 18, 1249-1260 (doi:10.1039/C5GC02147B, inside front cover, highlighted in Chemistry World)
    • Structural analysis of hierarchically-organized zeolites
      S. Mitchell, A.B. Pinar, J. Kenvin, P. Crivelli, J. Kärger, J. Pérez-Ramírez
      Nat. Commun. 2015, 6:8633 (doi:10.1038/ncomms9633)
    • Aluminum redistribution during the preparation of hierarchical zeolites by desilication
      S. Mitchell, M. Milina, R. Verel, M. Hernández-Rodríguez, A.B. Pinar, L.B. McCusker, J. Pérez-Ramírez
      Chem. Eur. J. 2015, 21, 14156-14164 (doi:10.1002/chem.201500992)
    • Design of base zeolite catalysts by alkali-metal grafting in alcoholic media
      T.C. Keller, K. Desai, S. Mitchell, J. Pérez-Ramírez
      ACS Catal. 2015, 5, 5388-5396 (doi:10.1021/acscatal.5b00761)
    • Structure analysis of a BEC-type germanosilicate zeolite including the location of the flexible organic cations in the channels
      S. Smeets, L. Koch, N. Mascello, J. Sesseg, L.B. McCusker, M. Hernández-Rodríguez, S. Mitchell, J. Pérez-Ramírez
      CrystEngComm 2015, 17, 4865-4870 (doi:10.1039/C5CE00731C)
    • Porosity-acidity interplay in hierarchical ZSM-5 zeolites for pyrolysis oil valorization to aromatics
      B. Puértolas, A. Veses, M.S. Callén, S. Mitchell, T. García, J. Pérez-Ramírez
      ChemSusChem 2015, 12, 2383-3293 (doi:10.1002/cssc.201500685)
    • Invited book review 'Principles and practice of heterogeneous catalysis, second completely revised edition'
      J. Pérez-Ramírez, S. Mitchell
      Angew. Chem. Int. Ed. 2015, 54, 6680-6681 (doi:10.1002/anie.201503261)
      Angew. Chem. 2015, 127, 6780-6781 (doi:10.1002/ange.201503261)
    • Hierarchically-structured MnO2-Co/C nanocomposites: highly efficient and magnetically-recyclable catalysts for the aerobic oxidation of alcohols
      J. Zhi, S. Mitchell, J. Pérez-Ramírez, O. Reiser
      ChemCatChem 2015, 7, 2585-2589 (doi:10.1002/cctc.201500549)
    • Unified method to the total pore volume and pore size distribution of hierarchical zeolites from argon adsorption and mercury intrusion
      J. Kenvin, J. Jagiello, S. Mitchell, J. Pérez-Ramírez
      Langmuir 2015, 31, 1242-1247 (doi:10.1021/la504575s)
    • Structuring zeolite bodies for enhanced heat-transfer properties
      L. Borchardt, N.-L. Michels, T. Nowak, S. Mitchell, J. Pérez-Ramírez
      Microporous Mesoporous Mater. 2015, 208, 196-202 (doi:10.1016/j.micromeso.2015.01.028)
    • Impact of pore connectivity in the design of long-lived zeolite catalysts
      M. Milina, S. Mitchell, D. Cooke, P. Crivelli, J. Pérez-Ramírez
      Angew. Chem. Int. Ed. 2015, 54, 1591-1594 (doi:10.1002/anie.201410016, back cover)
    • Hydroxyapatite, an exceptional catalyst for the gas-phase deoxygenation of bio-oil by aldol condensation
      E.G. Rodrigues, T.C. Keller, S. Mitchell, J. Pérez-Ramírez
      Green Chem. 2014, 16, 4870-4874 (doi:10.1039/C4GC01432D, front cover)
    • Design of hydrothermally-stable dawsonite-based sorbents in technical form for CO2 capture
      O. Martin, M. Hammes, S. Mitchell, J. Pérez-Ramírez
      Energy Envion. Sci. 2014, 7, 3640-3650 (doi:10.1039/c4ee02012j)
    • Effects of binders on the performance of shaped hierarchical MFI zeolites in methanol-to-hydrocarbons
      N.-L. Michels, S. Mitchell, J. Pérez-Ramírez
      ACS Catal. 2014, 4, 2409-2417 (doi:10.1021/cs500353b, front cover)
    • From the Lindlar catalyst to supported ligand-modified palladium nanoparticles: selectivity patterns and accessibility constraints in the continuous-flow three-phase hydrogenation of acetylenic compounds
      G. Vilé, N. Almora-Barrios, S. Mitchell, N. López, J. Pérez-Ramírez
      Chem. Eur. J. 2014, 20, 5926-5937 (doi:10.1002/chem.201304795, front cover, highlighted in ChemistryViews)
    • Superior mass transfer properties of technical zeolite bodies with hierarchical porosity
      L. Gueudré, M. Milina, S. Mitchell, J. Pérez-Ramírez
      Adv. Funct. Mater. 2014, 24, 209-219 (doi:10.1002/adfm.201203557, inside cover)
    • Mesopore quality determines the lifetime of hierarchically-structured zeolite catalysts
      M. Milina, S. Mitchell, P. Crivelli, D. Cooke, J. Pérez-Ramírez
      Nat. Commun. 2014, 5:3922 (doi:10.1038/ncomms4922)
    • Rediscovering zeolite mechanochemistry - a pathway beyond current synthesis and modification boundaries
      G. Majano, L. Borchardt, S. Mitchell, V. Valtchev, J. Pérez-Ramírez
      Microporous Mesoporous Mater. 2014, 194, 106-114 (doi:10.1016/j.micromeso.2014.04.006)
    • Prospectives for bio-oil upgrading via esterification over zeolite catalysts
      M. Milina, S. Mitchell, J. Pérez-Ramírez
      Catal. Today 2014, 235, 176-183 (doi:10.1016/j.cattod.2014.02.047)
    • Bifunctional Cu/H-ZSM-5 zeolite with hierarchical porosity for hydrocarbon abatement under cold-start conditions
      B. Puértolas, L. García-Andujar, T. García, M.V. Navarro, S. Mitchell, J. Pérez-Ramírez
      Appl. Catal., B 2014, 154-155, 161-170 (doi:10.1016/j.apcatb.2014.02.013)
    • Hierarchical zeolites by desilication: occurrence and catalytic impact of recrystallization and restructuring
      D. Verboekend, M. Milina, S. Mitchell, J. Pérez-Ramírez
      Cryst. Growth Des. 2013, 13, 5025-5035 (doi:10.1021/cg4010483, front cover)
    • Interdependence between porosity, acidity, and catalytic performance in hierarchical ZSM-5 zeolites prepared by post-synthetic modification
      M. Milina, S. Mitchell, N.-L. Michels, J. Kenvin, J. Pérez Ramírez
      J. Catal. 2013, 308, 398-407 (doi:10.1016/j.jcat.2013.08.020)
    • Advanced visualization strategies bridge the multidimensional complexity of technical catalysts
      S. Mitchell, N.-L. Michels, G. Majano, J. Pérez-Ramírez
      Curr. Opin. Chem. Eng. 2013, 2, 304-311 (doi:10.1016/j.coche.2013.04.005)
    • From powder to technical body: the undervalued science of catalyst scale up
      S. Mitchell, N.-L. Michels, J. Pérez-Ramírez
      Chem. Soc. Rev. 2013, 42, 6094-6112 (doi:10.1039/C3CS60076A, inside cover)
    • Hierarchical zeolites overcome all obstacles: next stop industrial implementation
      D. Verboekend, S. Mitchell, J. Pérez-Ramírez
      Chimia 2013, 67, 327-332 (doi:10.2533/chimia.2013.327)
    • Hierarchical FAU and LTA-type zeolites by post-synthetic design: a new generation of highly efficient base catalysts
      D. Verboekend, T.C. Keller, S. Mitchell, J. Pérez-Ramírez
      Adv. Funct. Mater. 2013, 23, 1923-1934 (doi:10.1002/adfm.201202320, front cover)
    • Surface and pore structure assessment of hierarchical MFI zeolites by advanced water and argon sorption studies
      M. Thommes, S. Mitchell, J. Pérez-Ramírez
      J. Phys. Chem. C 2012, 116, 18816-18823 (doi:10.1021/jp3051214)
    • Hierarchically structured zeolite bodies: assembling micro-, meso-, and macroporosity levels in complex materials with enhanced properties
      N.-L. Michels, S. Mitchell, M. Milina, K. Kunze, F. Krumeich, F. Marone, M. Erdmann, N. Marti, J. Pérez-Ramírez
      Adv. Funct. Mater. 2012, 22, 2509-2518 (doi:10.1002/adfm.201103120)
    • Visualization of hierarchically structured zeolite bodies from macro to nano length scales
      S. Mitchell, N.-L. Michels, K. Kunze, J. Pérez-Ramírez
      Nature Chem. 2012, 4, 825-831 (doi:10.1038/nchem.1403)
    • Jenseits des Gewohnten
      D. Verboekend, S. Mitchell, J. Pérez-Ramírez
      Chemie&more 2012, 168, 1-2
    • Decoupling porosity and compositional effects on desilicated ZSM-5 zeolites for optimal alkylation performance
      M. Milina, S. Mitchell, Z. Domínguez Trinidad, D. Verboekend, J. Pérez-Ramírez
      Catal. Sci. Technol. 2012, 2, 759-766 (doi:10.1039/C2CY00456A)
    • Expanding the horizons of hierarchical zeolites: beyond laboratory curiosity towards industrial realization
      J. Pérez-Ramírez, S. Mitchell, D. Verboekend, M. Milina, N.-L. Michels, F. Krumeich, N. Marti, M. Erdmann
      ChemCatChem 2011, 3, 1731-1734 (doi:10.1002/cctc.201100264)
    • Towards more efficient monodimensional zeolite catalysts: n-alkane hydro-isomerisation on hierarchical ZSM-22
      D. Verboekend, K. Thomas, M. Milina, S. Mitchell, J. Pérez-Ramírez, J.-P. Gilson
      Catal. Sci. Technol. 2011, 1, 1331-1335 (doi:10.1039/C1CY00240F)
    • Full compositional flexibility in the preparation of mesoporous MFI zeolites by desilication
      D. Verboekend, S. Mitchell, M. Milina, J.C. Groen, J. Pérez-Ramírez
      J. Phys. Chem. C 2011, 115, 14193-14203 (doi:10.1021/jp201671s)
    • Preparation of organic-functionalized mesoporous ZSM-5 zeolites by consecutive desilication and silanization
      S. Mitchell, A. Bonilla, J. Pérez-Ramírez
      Mater. Chem. Phys. 2011, 127, 278-284 (doi:10.1016/j.matchemphys.2011.02.003)
    • Mesoporous zeolites as enzyme carriers: synthesis, characterization, and application in biocatalysis
      S. Mitchell, J. Pérez-Ramírez
      Catal. Today 2011, 168, 28-37 (doi:10.1016/j.cattod.2010.10.058)
    • Perturbing the properties of layered double hydroxides by continuous coprecipitation with short residence time
      S. Abelló, S. Mitchell, M. Santiago, G. Stoica, J. Pérez-Ramírez
      J. Mater. Chem. 2010, 20, 5878-5887 (doi:10.1039/C0JM00088D)
    • Comparative study of the synthesis of layered transition metal molybdates
      S. Mitchell, A. Gomez-Aviles, C. Gardner, W. Jones
      J. Solid State Chem. 2010, 183, 198-207 (doi:10.1016/j.jssc.2009.10.011)
    • The application of focused microwave irradiation coupled with freeze drying to investigate the reaction of MgO and Al2O3slurries in the formation of layered double hydroxides
      S. Mitchell, I. Baxendale and W. Jones
      Green Chem. 2008, 9, 373-378 (doi:10.1039/B801365A)
    • A synchrotron radiation study of the hydrothermal synthesis of layered double hydroxides from MgO and Al2Oslurries
      S. Mitchell, T. Biswick, W. Jones, G. Williams, D. O'Hare
      Green Chem. 2007, 9, 373-378 (doi:10.1039/B613795D)