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Title: Low Temperature Propane Oxidation over Co 3O 4 based Nano-array Catalysts. Ni Dopant Effect, Reaction Mechanism and Structural Stability

Low temperature propane oxidation has been achieved by Co 3O 4-based nano-array catalysts featuring low catalytic materials loading. The Ni doping into the Co 3O 4 lattice has led to enhanced reaction kinetics at low temperature by promoting the surface lattice oxygen activity. In situ DRIFTS investigation in tandem with isotopic oxygen exchange reveals that the propane oxidation proceeds via Mars-van Krevelen mechanism where surface lattice oxygen acts as the active site whereas O 2 in the reaction feed does not directly participate in CO 2 formation. The Ni doping promotes the formation of less stable carbonates on the surface to facilitate the CO 2 desorption. The thermal stability of Ni doped Co 3O 4 decreases with increased Ni concentration while catalytic activity increases. A balance between enhanced activity and compromised thermal stability shall be considered in the Ni doped Co 3O 4 nano-array catalysts for low temperature hydrocarbon oxidation. This study provides useful and timely guidance for rational catalyst design toward low temperature catalytic oxidation.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1] ;  [3] ;  [1] ;  [1]
  1. Univ. of Connecticut, Storrs, CT (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. National Univ. of Singapore (Singapore)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Applied Catalysis. B, Environmental
Additional Journal Information:
Journal Volume: 180; Journal Issue: 1; Journal ID: ISSN 0926-3373
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1213987
Alternate Identifier(s):
OSTI ID: 1398071