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SUMMARY:Chemical Engineering Seminar - The heart of darkness... in heterog
 eneous catalysis
DTSTART:20200501T161500
DTEND:20200501T173000
DTSTAMP:20260921T093809Z
UID:ca91cb8e5c68fa0d31736fcfdca7ea947c15f33287e6f36afa25dffc
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Aditya Bhan\, Department of Chemical Engineering and Mat
 erials Science\, University of Minnesota\, USA\nNote: This seminar will t
 ake place online at the following link:  \n\nhttps://epfl.zoom.us/j/9176
 0958454?pwd=alhFWURSaVQ5bWtEYUhsOXZ4c2E3Zz09 \n\nMeeting ID: 917 6095 845
 4\n\nPassword: EPFL\n\n\nHeterogeneous catalysts enable functionalization
  and derivatization of molecules for use as energy carriers\, polymer pre
 cursors\, and fine chemicals and mitigate the environmental consequences 
 engendered in their production and consumption. With the underlying tene
 t that nothing is more fundamental to the understanding of catalysis than
  the accurate measurement and interpretation of rates of reaction\, we il
 lustrate the utility of chemical kinetics in providing insight into two 
 catalytic systems of technological relevance.\n \nThe first part of this 
 presentation will discuss our efforts on controlling the rate and reversi
 bility of non-oxidative CH4 dehydroaromatization on Mo/ZSM-5. Well-dispe
 rsed carbidic Mo aggregates (MoCx) circumscribed in the pores of a mediu
 m-pore zeolite\, ZSM-5\, catalyze CH4 dehydroaromatization (DHA) with hi
 gh benzene (>70%) and aromatic (>95%) selectivity at conversions near the
  ~10% equilibrium limit at ~950 K. Net benzene formation rates are limit
 ed by reaction endothermicity and approach zero as methane conversion nea
 rs the ~10% equilibrium limit. We (i) leverage the “non-selective” de
 activation of MoCx/H-ZSM-5 catalysts to discern the connectivity of the 
 methane to benzene reaction network\, (ii) demonstrate Mo is the sole kin
 etically-relevant active site in MoCx/H-ZSM-5 catalysts\, (iii) evoke and
  develop existing formalisms to extract intrinsic kinetic information in
  highly-reversible reaction systems\, and (iv) circumvent thermodynamic b
 arriers to methane DHA by in-situ H2 removal.\n \nThe second part of thi
 s presentation will describe the mechanistic origins of over-oxidation an
 d C-C bond scission products in the partial oxidation of propylene to acr
 olein on mixed metal oxide catalysts. We combine transient kinetic studie
 s\, co-feed experiments of aldehydes and carboxylic acids formed as bypro
 ducts in propylene oxidation\, and isotopic-labeling studies to elucidate
  the reaction mechanisms\, identify the existence and the involvement of
  relevant surface intermediates\, and develop an extensive reaction kinet
 ic model describing the formation of all C2 – C6 products (> 20 C2-C6
  products are formed in this chemistry at carbon selectivity as low as 
 0.001%)\, to evince the underlying mechanisms for C-C bond cleavage and f
 ormation reactions and the rates of these chemical pathways.
LOCATION:
STATUS:CONFIRMED
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