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Effect of Reduction Treatment on CO Oxidation with CeO 2 Nanorod‐Supported CuO x Catalysts
Author(s) -
Mock Samantha A.,
Zell Elizabeth T.,
Hossain Shaikh T.,
Wang Ruigang
Publication year - 2018
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.201700972
Subject(s) - nanorod , catalysis , redox , raman spectroscopy , materials science , temperature programmed reduction , copper , thermal treatment , chemical engineering , oxidation state , hydrogen , transmission electron microscopy , inorganic chemistry , nanotechnology , chemistry , metallurgy , biochemistry , physics , engineering , organic chemistry , optics , composite material
Understanding the correlation of thermal treatment with catalyst activity provides mechanistic information about how the catalysts can be activated or deactivated. In this paper, we report that a comparative study was conducted on CeO 2 nanorod‐supported CuO x catalysts before and after reduction treatment to gain insight on the effects of the copper oxidation state and catalyst–support interfacial interactions on CO oxidation. X‐ray diffraction, Raman spectroscopy, hydrogen temperature‐programmed reduction (H 2 ‐TPR), and transmission electron microscopy (TEM) were used in a comprehensive way to study the effects of CuO x (0≤ x ≤1) composition as well as their spatial distribution on CeO 2 nanorods on the H 2 consumption and CO oxidation of the catalysts. These techniques were then used to gain a better understanding of the correlation between the different copper species (α, β, and γ‐type CuO x ) and the multiple reduction (H 2 consumption) peaks, found in the H 2 ‐TPR data during the first run and during in situ reduction and redox cycling experiments. Also concluded from this study is that an abundance of surface defects are found on CeO 2 nanorods from high‐resolution TEM, which consequently may be critical to strong CuO x (0≤ x ≤1)–CeO 2− x (0≤ x ≤0.5) interactions, therefore resulting in the improved low‐temperature catalytic activity.