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Strong Metal–Support Interactions for Palladium Supported on TiO 2 Catalysts in the Heterogeneous Hydrogenation with Parahydrogen
Author(s) -
Kovtunov Kirill V.,
Barskiy Danila A.,
Salnikov Oleg G.,
Burueva Dudari B.,
Khudorozhkov Alexander K.,
Bukhtiyarov Andrey V.,
Prosvirin Igor P.,
Gerasimov Evgeny Y.,
Bukhtiyarov Valerii I.,
Koptyug Igor V.
Publication year - 2015
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201500618
Subject(s) - spin isomers of hydrogen , palladium , catalysis , hydrogen , chemistry , dissolution , metal , butane , photochemistry , heterogeneous catalysis , x ray photoelectron spectroscopy , inorganic chemistry , chemical engineering , organic chemistry , engineering
Parahydrogen‐induced polarization (PHIP) was successfully utilized to demonstrate the strong metal–support interaction (SMSI) effect for palladium supported on titania catalysts. Heterogeneous hydrogenation of 1,3‐butadiene over Pd/TiO 2 catalysts led to the formation of 1‐ and 2‐butenes and butane, and hyperpolarized products were obtained if parahydrogen was used in the reaction. However, if the catalysts were reduced in H 2 flow at 500 °C before the hydrogenation reaction, the observed polarization levels were significantly lower or even zero, which was indicative of the suppression of the pairwise addition of hydrogen route. This observation indicated the possibility to detect the SMSI effect by the PHIP technique. Moreover, by using X‐ray photoelectron spectroscopy it was shown that Pd is partially present as Pd δ + after reduction under a hydrogen atmosphere at 500 °C. These results were confirmed by transmission electron microscopy, which revealed the formation of Pd δ + and the dissolution of Pd in the titania lattice.