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

Abstract

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.

Authors:
 [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)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1319196
Grant/Contract Number:  
AC05-00OR22725; FG02-12ER16353
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats

Tao, Franklin Feng, Shan, Jun-jun, Nguyen, Luan, Wang, Ziyun, Zhang, Shiran, Zhang, Li, Wu, Zili, Huang, Weixin, Zeng, Shibi, and Hu, P. Understanding complete oxidation of methane on spinel oxides at a molecular level. United States: N. p., 2015. Web. doi:10.1038/ncomms8798.
Tao, Franklin Feng, Shan, Jun-jun, Nguyen, Luan, Wang, Ziyun, Zhang, Shiran, Zhang, Li, Wu, Zili, Huang, Weixin, Zeng, Shibi, & Hu, P. Understanding complete oxidation of methane on spinel oxides at a molecular level. United States. https://doi.org/10.1038/ncomms8798
Tao, Franklin Feng, Shan, Jun-jun, Nguyen, Luan, Wang, Ziyun, Zhang, Shiran, Zhang, Li, Wu, Zili, Huang, Weixin, Zeng, Shibi, and Hu, P. Tue . "Understanding complete oxidation of methane on spinel oxides at a molecular level". United States. https://doi.org/10.1038/ncomms8798. https://www.osti.gov/servlets/purl/1319196.
@article{osti_1319196,
title = {Understanding complete oxidation of methane on spinel oxides at a molecular level},
author = {Tao, Franklin Feng and Shan, Jun-jun and Nguyen, Luan and Wang, Ziyun and Zhang, Shiran and Zhang, Li and Wu, Zili and Huang, Weixin and Zeng, Shibi and Hu, P.},
abstractNote = {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.},
doi = {10.1038/ncomms8798},
journal = {Nature Communications},
number = ,
volume = 6,
place = {United States},
year = {Tue Aug 04 00:00:00 EDT 2015},
month = {Tue Aug 04 00:00:00 EDT 2015}
}

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