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Title: Understanding complete oxidation of methane on spinel oxides at a molecular level

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms8798· OSTI ID:1319196
 [1];  [2];  [2];  [3];  [2];  [4];  [4];  [2];  [2];  [3]
  1. Univ. of Kansas, Lawrence, KS (United States). Dept. of Chemical and Petroleum Engineering; Univ. of Kansas, Lawrence, KS (United States). Dept. of Chemistry
  2. Univ. of Kansas, Lawrence, KS (United States). Dept. of Chemical and Petroleum Engineering; Univ. of Kansas, Lawrence, KS (United States). Dept. of Chemistry
  3. Queens Univ., Blefast (United Kingdom). School of Chemistry and Chemical Engineering
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)

It is crucial to develop a catalyst made of earth-abundant elements highly active for a complete oxidation of methane at a relatively low temperature. NiCo2O4 consisting of earth-abundant elements which can completely oxidize methane in the temperature range of 350-550 °C. Being a cost-effective catalyst, NiCo2O4 exhibits activity higher than precious-metal-based catalysts. Here we report that the higher catalytic activity at the relatively low temperature results from the integration of nickel cations, cobalt cations and surface lattice oxygen atoms/oxygen vacancies at the atomic scale. Finally, in situ studies of complete oxidation of methane on NiCo2O4 and theoretical simulations show that methane dissociates to methyl on nickel cations and then couple with surface lattice oxygen atoms to form -CH3O with a following dehydrogenation to -CH2O; a following oxidative dehydrogenation forms CHO; CHO is transformed to product molecules through two different sub-pathways including dehydrogenation of OCHO and CO oxidation.

Research Organization:
Oak Ridge National Laboratory (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; FG02-12ER16353
OSTI ID:
1319196
Journal Information:
Nature Communications, Vol. 6; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 213 works
Citation information provided by
Web of Science

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Design of active NiCo 2 O 4‐δ spinel catalyst for abatement of CO‐CH 4 emissions from CNG fueled vehicles journal April 2018
Ferrocene‐Linkage‐Facilitated Charge Separation in Conjugated Microporous Polymers journal February 2019
Low-Temperature Transformation of Methane to Methanol on Pd 1 O 4 Single Sites Anchored on the Internal Surface of Microporous Silicate journal September 2016
Ferrocene-Linkage-Facilitated Charge Separation in Conjugated Microporous Polymers journal February 2019
Photoionization Mass Spectrometry for Online Detection of Reactive and Unstable Gas‐Phase Intermediates in Heterogeneous Catalytic Reactions journal December 2019
Catalytic Oxidation of Methane: Pd and Beyond: Catalytic Oxidation of Methane: Pd and Beyond journal June 2018
Deactivation Mechanism, Countermeasures, and Enhanced CH 4 Oxidation Performance of Nickel/Cobalt Oxides journal September 2019
Perovskite catalysts for methane combustion: applications, design, effects for reactivity and partial oxidation journal August 2019
Photocatalytic oxidation of methane over silver decorated zinc oxide nanocatalysts journal July 2016
Catalysis on singly dispersed bimetallic sites journal August 2015
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Transition of surface phase of cobalt oxide during CO oxidation journal January 2018
Interactions of gaseous molecules with X-ray photons and photoelectrons in AP-XPS study of solid surface in gas phase journal January 2018
Synthesis of K–Pd doped NiCo 2 O 4−δ by reactive calcination route for oxidation of CO–CH 4 emissions from CNG vehicles journal January 2018
Facile fabrication of shape-controlled Co x Mn y O β nanocatalysts for benzene oxidation at low temperatures journal January 2018
Evidence of the O–Pd–O and Pd–O 4 structure units as oxide seeds and their origin on Pd(211): revealing the mechanism of surface oxide formation journal January 2019
Selectively anchoring Pt single atoms at hetero-interfaces of γ-Al 2 O 3 /NiS to promote the hydrogen evolution reaction journal January 2018
Stable complete methane oxidation over palladium based zeolite catalysts text January 2018
Ultrahigh Electrocatalytic Conversion of Methane at Room Temperature journal September 2017
Synthesis of a Highly Stable Pd@CeO 2 Catalyst for Methane Combustion with the Synergistic Effect of Urea and Citric Acid journal December 2018