10.1021/jz5009483.s001
Cristihan Carrillo
Cristihan
Carrillo
Tyne R. Johns
Tyne R.
Johns
Haifeng Xiong
Haifeng
Xiong
Andrew DeLaRiva
Andrew
DeLaRiva
Sivakumar
R. Challa
Sivakumar
R.
Challa
Ronald S. Goeke
Ronald S.
Goeke
Kateryna Artyushkova
Kateryna
Artyushkova
Wei Li
Wei
Li
Chang H. Kim
Chang H.
Kim
Abhaya K. Datye
Abhaya K.
Datye
Trapping
of Mobile Pt Species by PdO Nanoparticles
under Oxidizing Conditions
American Chemical Society
2015
diesel exhaust catalysis
catalyst
Mobile Pt Species
PdO
oxidizing conditions
2015-12-17 02:43:28
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Trapping_of_Mobile_Pt_Species_by_PdO_Nanoparticles_under_Oxidizing_Conditions/2034828
Pt is an active catalyst for diesel
exhaust catalysis but is known
to sinter and form large particles under oxidizing conditions. Pd
is added to improve the performance of the Pt catalysts. To investigate
the role of Pd, we introduced metallic Pt nanoparticles via physical
vapor deposition to a sample containing PdO nanoparticles. When the
catalyst was aged in air, the Pt particles disappeared, and the Pt
was captured by the PdO, forming bimetallic Pt–Pd nanoparticles.
The formation of metallic Pt–Pd alloys under oxidizing conditions
is indeed remarkable but is consistent with bulk thermodynamics. The
results show that mobile Pt species are effectively trapped by PdO,
representing a novel mechanism by which Ostwald ripening is slowed
down. The results have implications for the development of sinter-resistant
catalysts and help explain the improved performance and durability
of Pt–Pd in automotive exhaust catalytic converters.