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SUMMARY:Determination of the state of the active component of nanocomposit
 e model metal-carbon catalysts by XAFS method
DTSTART;VALUE=DATE-TIME:20200713T142100Z
DTEND;VALUE=DATE-TIME:20200713T142200Z
DTSTAMP;VALUE=DATE-TIME:20260307T090519Z
UID:indico-contribution-1899@indico.inp.nsk.su
DESCRIPTION:Speakers: Vladimir Kriventsov ()\nThis report shows the result
 s of XAFS (XANES/EXAFS) research on the state and local structure of metal
 s in the active component of model low-percentage metal-carbon nanocomposi
 te catalysts containing nanoscale forms of Pt\, Pd\, Ru. It is a well-know
 n fact that low-percentage catalytic nanosystems containing platinoids dep
 osited on various carbon carriers are of great interest to researchers bec
 ause of their practical significance\; possibilities for varying catalytic
  properties and applications for a wide range of processes (hydrogenation\
 , conversion of industrial substrates\, debenzylation of amines\, etc.).)\
 , low cost of final products\, ease of disposal and recovery of expensive 
 components from spent catalysts. Model samples were prepared from precurso
 rs of different nature\, with varying methods of synthesis and formation o
 f the applied component\, recovery and activation modes. XAFS (XANES/EXAFS
 ) spectra (Pt-L3\, Pd-K\, Ru-K) of studied samples were recorded at SSTRC\
 , Novosibirsk.  The lengths of interatomic bonds and the corresponding coo
 rdination numbers are established. Additionally XPS\, TEM\, XRD\, XRF meth
 ods were applied to study chemical and phase compositions\, morphology of 
 the samples. Data obtained by different methods do not contradict each oth
 er. Possible variants of structural models are considered in detail. Corre
 lations were found between the structure of the active component and the c
 atalytic properties of the studied samples. The perspective of the propose
 d approach for the study of nanocomposite model metal-carbon catalysts con
 taining platinoids is shown.\nThe work was carried out in the framework of
  the RFBR projects no. 19-05-50046\, 18-03-01251. The work was done at the
  shared research center SSTRC on the basis of the Novosibirsk FEL/VEPP-4-V
 EPP-2000 complex at BINP SB RAS\, using equipment supported by project RFM
 EFI62119X0022.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1899/
LOCATION:
URL:https://indico.inp.nsk.su/event/24/contributions/1899/
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