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SUMMARY:Chemical Engineering Seminar - Single Metal Atoms as Game-Changers
  in Heterogeneous Catalysis
DTSTART:20190524T161500
DTEND:20190524T173000
DTSTAMP:20260530T140848Z
UID:0d4c672453e2cf5621b7fb6eb0770298daa0dfb9b3c5f1f440dd8c01
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Maria Flytzani-Stephanopoulos\,  Department of Chemi
 cal Engineering\, Tufts University\, USA.\nIdentification of the active c
 atalytic site and design of catalysts with 100% atom efficiency has been a
  long-standing goal in heterogeneous catalysis. A promising approach to re
 aching this goal through the controlled preparation of isolated single-ato
 m heterogeneous catalysts has emerged in the recent literature. For cataly
 tic metals\, atomic dispersion affords better utilization\, different (oft
 en better) selectivity than the extended metal\, and new prospects for low
 -cost and green process development. Isolated supported metal atoms may be
  viewed as species bonded to a support\, the latter serving as a ligand. A
 n analogy between a homogeneous and a heterogeneous single-site catalytic 
 center can thus be made. Single atom sites catalyze some\, but not all rea
 ctions. It is crucial to understand the mechanisms behind catalysis by sup
 ported single metal atoms\, as this will guide the new\, improved catalyst
  designs.\nIn this presentation\, suitably stabilized catalytic sites as s
 ingle metal atoms/cations on various supports will be showcased drawing ex
 amples from a variety of reactions\, including the low-temperature water-g
 as shift reactions\; methanol and ethanol dehydrogenation and steam reform
 ing reactions\; the direct methane conversion to oxygenates\; and selectiv
 e hydrogenation reactions on single-atom alloys. Reaction mechanisms invol
 ving single metal atoms/cations often transcend support structure and comp
 osition\, thus allowing flexibility in the choice of the support. A unique
  “signature” of the metal (Au\, Pt\, Pd\, Ni\, etc.) at the atomic sta
 te is preserved\, distinct however from the corresponding extended metal c
 atalyst.  Novel synthesis methods will be discussed as will be the stabil
 ity of single-atom metal catalysts in various supports and reaction enviro
 nments.
LOCATION:BCH 2201 https://plan.epfl.ch/?room==BCH%202201
STATUS:CONFIRMED
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