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Title: Origin of Active Oxygen in a Ternary CuOx /Co3O4–CeO 2 Catalyst for CO Oxidation

Journal Article · · Journal of Physical Chemistry. C
DOI:https://doi.org/10.1021/jp508487x· OSTI ID:1286745
 [1];  [2];  [3];  [4];  [2];  [5]
  1. Hunan Univ., Changsha (China). School of Chemistry and Chemical Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
  3. Arizona State Univ., Mesa, AZ (United States). School of Letters and Sciences
  4. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry
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In this paper, we have studied CO oxidation over a ternary CuOx/Co3O4-CeO2 catalyst and employed the techniques of N2 adsorption/desporption, XRD, TPR, TEM, in situ DRIFTS and QMS (Quadrupole mass spectrometer) to explore the origin of active oxygen. DRIFTS-QMS results with labeled 18O2 indicate that the origin of active oxygens in CuOx/Co3O4-CeO2 obeys a model, called as queue mechanism. Namely gas-phase molecular oxygens are dissociated to atomic oxygens and then incorporate in oxygen vacancies located at the interface of Co3O4-CeO2 to form active crystalline oxygens, and these active oxygens diffuse to the CO-Cu+ sites thanks to the oxygen vacancy concentration magnitude and react with the activated CO to form CO2. This process, obeying a queue rule, provides active oxygens to form CO2 from gas-phase O2 via oxygen vacancies and crystalline oxygen at the interface of Co3O4-CeO2.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; 21103045; 1210040; 1103312
OSTI ID:
1286745
Journal Information:
Journal of Physical Chemistry. C, Vol. 118, Issue 48; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 45 works
Citation information provided by
Web of Science

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Cited By (7)

Hollow Multishelled Structure of Heterogeneous Co 3 O 4 –CeO 2− x Nanocomposite for CO Catalytic Oxidation journal January 2019
Effects of the Fe/Ce ratio on the activity of CuO/CeO 2 –Fe 2 O 3 catalysts for NO reduction by CO journal January 2018
Nanostructured cerium oxide: preparation, characterization, and application in energy and environmental catalysis journal November 2016
Rational Engineering of Multilayered Co 3 O 4 /ZnO Nanocatalysts through Chemical Transformations from Matryoshka‐Type ZIFs journal August 2019
Low‐Temperature CO Oxidation over a Ternary Oxide Catalyst with High Resistance to Hydrocarbon Inhibition journal September 2015
Oxygen storage capacity and thermal stability of the CuMnO 2 –CeO 2 composite system journal January 2015
Low-Temperature CO Oxidation over a Ternary Oxide Catalyst with High Resistance to Hydrocarbon Inhibition journal September 2015

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CuOx/Co3O4-CeO2
CO oxidation
Queue mechanism
Interface interaction
Oxygen vacancy