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SUMMARY:IMX Seminar Series - X-ray Spectroscopy Techniques Probing Active 
 Species in Homogeneous Catalysis
DTSTART:20191014T131500
DTEND:20191014T141500
DTSTAMP:20260509T165955Z
UID:27f5d2ed3166ba5803d471f5a0c79615afa670dc40e51c124f474316
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Moniek Tromp\, University of Groningen The Netherlands\n
 Detailed information on the structural and electronic properties of a cata
 lyst or material and how they change during reaction is required to unders
 tand their reaction mechanism and performance. An experimental technique t
 hat can provide structural as well as electronic analysis and that can be 
 applied in situ/operando and in a time-resolved mode\, is X-ray spectrosco
 py. Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy is power
 ful in determining the local structure of compounds including amorphous ma
 terials and solutions\, since long-range order is not required. Combined X
 -ray Absorption and X-ray Emission spectroscopy (XAS and XES resp.) provid
 es detailed insights in the electronic properties of a material. Detailed 
 information about the materials in their dynamic chemical active environme
 nt can thus be obtained and structure/electronic – performance relations
 hips and reaction mechanisms derived. Developments in XAS using new instru
 mentation and data acquisition methods while selecting specific X-ray ener
 gies provide this more detailed electronic information [1]. High energy re
 solution XAS\, XES and Resonant Inelastic X-ray Scattering (RIXS) provide 
 very detailed electronic information on the systems under investigation. T
 he secondary spectrometer design also opens up lab-based spectrometer desi
 gns as will be demonstrated.\nOver the last years\, different approaches h
 ave been reported to allow operando time resolved XAS on catalytic systems
 \, mostly solid-gas. Our group has also developed stopped-flow methodologi
 es allowing simultaneous time-resolved UV–Vis/XAS experimentation on liq
 uid systems down to the millisecond (ms) time resolution [2]. Low X-ray en
 ergy systems (light elements) or for low concentrated systems\, longer XAS
  data acquisition times in fluorescence detection are required and therefo
 re a stopped flow freeze-quench procedure has been developed [3]. Pushing 
 the time-resolution has been achieved by synchronizing the synchrotron bun
 ches with an optical laser in order to perform fast pump-probe experiments
  [4] or applying modulation excitation methodologies\, which can isolate a
 ctive from spectator species [5].\nThe methodologies and instrumentation h
 ave been developed and applied to a wealth of materials science\, for homo
 geneous and heterogeneous catalysis to batteries and fuel cells as well as
  art objects. This lecture will focus on homogeneous catalysis\, providing
  insights in active/activated catalyst species and reaction mechanisms. A 
 range of complementary spectroscopic techniques have for example been appl
 ied to different selective ethene oligomerisation catalysts\, i.e. industr
 ially applied chromium-based ones as well as novel iron and nickel-based s
 ystems [2]. Solving the complicated puzzles of data\, revealing active and
  inactive catalyst intermediates as a function of time and process conditi
 ons\, 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.\n\nBio: Moniek Tromp finished her MSc in Chemistry\, with sp
 ecialisations in spectroscopy and catalysis\, at the University of Utrecht
  (Nld) in 2000. She then obtained a PhD from the same university\, in the 
 fields of homogeneous catalysis and time-resolved X-ray absorption spectro
 scopy with Profs. Koningsberger and van Koten.  After finishing with dist
 inction (‘cum laude’\, greatest honours possible) in 2004\, she moved 
 to the University of Southampton (UK) for a Post-Doctoral Research fellows
 hip in the fields of heterogeneous catalysis and spectroscopy. In 2007\, s
 he was awarded an EPSRC Advanced Research Fellowship to start her own inde
 pendent academic career (and became lecturer). She moved to Germany in 201
 0\, where she took up a position as professor in Catalyst Characterisation
  at the Technical University Munich. In 2014\, she decided to come back to
  the Netherlands\, working at the University of Amsterdam. From July 2018 
 she has taken up the Chair of Materials Chemistry at the Zernike Institute
  at the University of Groningen.\nShe has been awarded prestigious fellows
 hips/awards like the EPSRC Advanced Research Fellowship\, NWO VIDI and the
  NWO Athena prize. She is active in numerous science advisory and review p
 anels of large research facilities and universities internationally\, part
  of a European Science Strategy team for large facilities\, has published 
 close to 100 papers in high profile journals and given over 80 invited lec
 tures 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
  Catalysis (NCCC) in The Netherlands. Gender and diversity are important f
 or her and she has been active as Gender Equality Officer (D) and is now d
 eveloping programs for primary school on science and engineering as well a
 s 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 membe
 r of the Dutch Science Association NWO (division ENW) since May 2019.\nHer
  research focusses on the development and application of operando spectros
 copy techniques in catalysis and materials research\, incl. fuel cells\, b
 atteries\, photochemistry\, as well as arts\, with a focus on X-ray spectr
 oscopy techniques. Novel (time resolved) X-ray absorption and emission spe
 ctroscopy methods have been developed as tools in catalysis and energy mat
 erial (battery and fuel cell) research. This includes the development of t
 he required operando instrumentation and cells\, as well as data analysis 
 and theoretical methods. Application of the techniques to fundamentally or
  industrially interesting catalytic processes and materials has been pursu
 ed\, providing unprecedented insights in properties and mechanisms.
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CANCELLED
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