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SUMMARY:Cancelled Event - IMX Seminar Series - X-ray Spectroscopy Techniqu
 es Probing Active Species in Homogeneous Catalysis
DTSTART:20200330T131500
DTEND:20200330T141500
DTSTAMP:20260506T080541Z
UID:2f1ef5b4edcc27b73c98bd99e3f32acda5f8aae41b6862a27cc40d94
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Moniek Tromp\, University of Groningen\, The Netherlands
 \nDetailed information on the structural and electronic properties of a ca
 talyst or material and how they change during reaction is required to unde
 rstand their reaction mechanism and performance. An experimental technique
  that can provide structural as well as electronic analysis and that can b
 e applied in situ/operando and in a time-resolved mode\, is X-ray spectros
 copy. Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy is pow
 erful in determining the local structure of compounds including amorphous 
 materials and solutions\, since long-range order is not required. Combined
  X-ray Absorption and X-ray Emission spectroscopy (XAS and XES resp.) prov
 ides detailed insights in the electronic properties of a material. Detaile
 d information about the materials in their dynamic chemical active environ
 ment can thus be obtained and structure/electronic – performance relatio
 nships and reaction mechanisms derived. Developments in XAS using new inst
 rumentation and data acquisition methods while selecting specific X-ray en
 ergies provide this more detailed electronic information [1]. High energy 
 resolution XAS\, XES and Resonant Inelastic X-ray Scattering (RIXS) provid
 e very detailed electronic information on the systems under investigation.
  The secondary spectrometer design also opens up lab-based spectrometer de
 signs as will be demonstrated.\nOver the last years\, different approaches
  have been reported to allow operando time resolved XAS on catalytic syste
 ms\, mostly solid-gas. Our group has also developed stopped-flow methodolo
 gies allowing simultaneous time-resolved UV–Vis/XAS experimentation on l
 iquid systems down to the millisecond (ms) time resolution [2]. Low X-ray 
 energy systems (light elements) or for low concentrated systems\, longer X
 AS data acquisition times in fluorescence detection are required and there
 fore a stopped flow freeze-quench procedure has been developed [3]. Pushin
 g the time-resolution has been achieved by synchronizing the synchrotron b
 unches with an optical laser in order to perform fast pump-probe experimen
 ts [4] or applying modulation excitation methodologies\, which can isolate
  active from spectator species [5].\nThe methodologies and instrumentation
  have been developed and applied to a wealth of materials science\, for ho
 mogeneous and heterogeneous catalysis to batteries and fuel cells as well 
 as art objects. This lecture will focus on homogeneous catalysis\, providi
 ng insights in active/activated catalyst species and reaction mechanisms. 
 A range of complementary spectroscopic techniques have for example been ap
 plied to different selective ethene oligomerisation catalysts\, i.e. indus
 trially applied chromium-based ones as well as novel iron and nickel-based
  systems [2]. Solving the complicated puzzles of data\, revealing active a
 nd inactive catalyst intermediates as a function of time and process condi
 tions\, has led to design concepts for novel catalysts in the field.\n\n[1
 ] See for example: Angew. Chem. Int. Ed. 45 (2006) 4651-4654\; J. Phys. Ch
 em. B 110 (2006) 16162-16164\; Angew. Chem. Int. Ed. 47 (2008) 9260 – 92
 64\; Catal. Today 145 (2009) 300-306\; J. Phys. Chem. C 117 (2013) 23286
 –23294\; Chem. Phys. Chem. 8 (2014) 1569–1572\; J. Phys. Chem. C 119 (
 2015) 2419–2426.\n[2] Organometallics 29 (2010) 3085–3097\; Phys. Chem
 . Chem. Phys. 2019\, ASAP.\n[3] J. Catal. 285 (2011) 247–258\; ACS Catal
 ysis 4 (2014) 4201\; Catal. Sci. Techn. 6 (2016) 6237\; ACS Catalysis 2019
 \, ASAP\, 10.1021/acscatal.8b03414.\n[4] J. Phys. Chem. B 117 (2013) 7381
 –7387\; Photochem. Photobiol. Sci. 17 (2018) 896-902.\n[5] manuscript in
  preparation.\nBio: Moniek Tromp finished her MSc in Chemistry\, with spec
 ialisations in spectroscopy and catalysis\, at the University of Utrecht (
 Nld) in 2000. She then obtained a PhD from the same university\, in the fi
 elds of homogeneous catalysis and time-resolved X-ray absorption spectrosc
 opy with Profs. Koningsberger and van Koten.  After finishing with distin
 ction (‘cum laude’\, greatest honours possible) in 2004\, she moved to
  the University of Southampton (UK) for a Post-Doctoral Research fellowshi
 p in the fields of heterogeneous catalysis and spectroscopy. In 2007\, she
  was awarded an EPSRC Advanced Research Fellowship to start her own indepe
 ndent academic career (and became lecturer). She moved to Germany in 2010\
 , where she took up a position as professor in Catalyst Characterisation a
 t the Technical University Munich. In 2014\, she decided to come back to t
 he Netherlands\, working at the University of Amsterdam. From July 2018 sh
 e has taken up the Chair of Materials Chemistry at the Zernike Institute a
 t the University of Groningen.\nShe has been awarded prestigious fellowshi
 ps/awards like the EPSRC Advanced Research Fellowship\, NWO VIDI and the N
 WO Athena prize. She is active in numerous science advisory and review pan
 els of large research facilities and universities internationally\, part o
 f a European Science Strategy team for large facilities\, has published cl
 ose to 100 papers in high profile journals and given over 80 invited lectu
 res worldwide.\nShe is chair of the Dutch Catalysis Society (of the KNCV).
  She is co-chair of the organizing committee of the annual conference on C
 atalysis (NCCC) in The Netherlands. Gender and diversity are important for
  her and she has been active as Gender Equality Officer (D) and is now dev
 eloping programs for primary school on science and engineering as well as 
 gender bias issues. From April 2019\, she has taken up a board position at
  the National Network for Female Professors (LNVH). She is a board member 
 of the Dutch Science Association NWO (division ENW) since May 2019.\nHer r
 esearch focusses on the development and application of operando spectrosco
 py techniques in catalysis and materials research\, incl. fuel cells\, bat
 teries\, photochemistry\, as well as arts\, with a focus on X-ray spectros
 copy techniques. Novel (time resolved) X-ray absorption and emission spect
 roscopy methods have been developed as tools in catalysis and energy mater
 ial (battery and fuel cell) research. This includes the development of the
  required operando instrumentation and cells\, as well as data analysis an
 d theoretical methods. Application of the techniques to fundamentally or i
 ndustrially interesting catalytic processes and materials has been pursued
 \, providing unprecedented insights in properties and mechanisms.\n 
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CANCELLED
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