Open AccessMechanistic Aspects of Wet and Dry CO Oxidation on Co3O4 Nanorod Surfaces: A NAP-UPS Study
Author(s) -
Ruchi Jain,
Edwin S. Gnanakumar,
Chinnakonda S. Gopinath
Publication year - 2017
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.6b00471
Subject(s) - nanorod , x ray photoelectron spectroscopy , catalysis , chemical engineering , oxide , chemistry , ultraviolet photoelectron spectroscopy , materials science , oxygen , ambient pressure , atmosphere (unit) , photochemistry , nanotechnology , organic chemistry , physics , engineering , thermodynamics
Catalytic activity, electronic structure, and the mechanistic aspects of Co 3 O 4 nanorod (NR) surfaces have been explored for CO oxidation in dry and wet atmosphere using near-ambient pressure ultraviolet photoelectron spectroscopy. Presence of water with CO + O 2 plummets the catalytic activity because of the change in the electronic nature from predominantly oxide (without water in feed) to a Co 3 O 4 surface covered by a few intermediates. However, at ≥375 K, the Co 3 O 4 surface recovers and regains the oxidation activity, at least partially, even in the presence of water. This is fully supported by the changes observed in the work function of Co 3 O 4 under wet (H 2 O + CO + O 2 ) conditions compared with dry (CO + O 2 ) conditions. This study focuses on the comparative CO oxidation rate on Co 3 O 4 NR surfaces and highlights the changes in the electronic structure that occur in the catalyst during the CO oxidation reaction.