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The deactivation of acidic sites of NiMo/B 2 O 3 –Al 2 O 3 catalysts during vegetable oil hydrodeoxygenation studied by EPR spectroscopy
Author(s) -
Yurpalov Vyacheslav L.,
Neponiashchii Aleksandr A.,
Drozdov Vladimir A.,
Antonicheva Nina V.,
Buluchevskiy Evgeniy A.,
Lavrenov Aleksandr V.
Publication year - 2021
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.5126
Subject(s) - electron paramagnetic resonance , hydrodeoxygenation , chemistry , catalysis , isomerization , thermogravimetric analysis , carbon fibers , differential thermal analysis , analytical chemistry (journal) , nuclear chemistry , organic chemistry , selectivity , nuclear magnetic resonance , materials science , physics , composite number , diffraction , optics , composite material
This paper presents the study results of NiMo/B 2 O 3 –Al 2 O 3 (0–30% wt. of B 2 O 3 ) catalysts for vegetable oil hydrodeoxygenation before and after catalytic tests by different electron paramagnetic resonance (EPR) methodologies. For the initial catalysts, the concentration of Brønsted acidic sites (BAS) determined by probe EPR with perylene increases linearly with an increase in the modifier (B 2 O 3 ) content in the samples. It was found that the isomerization activity of the catalysts increases with increasing the concentration of determined BAS. As for the spent catalysts, linear correlation of paramagnetic species concentration with the content of carbon deposits (determined by thermogravimetric analysis [TGA]/differential thermal analysis [DTA]) was found. The main reasons for the NiMo/B 2 O 3 –Al 2 O 3 catalysts deactivation over the formation of carbon deposits related to the participation of acidic sites (both Lewis and Brønsted) in the polycondensation of hydrocarbons via radical species are also proposed.