Journal
JOURNAL OF CATALYSIS
Volume 375, Issue -, Pages 478-492Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2019.04.008
Keywords
Density functional theory; Oxidative coupling of methane; Perovskite; Methyl radical adsorption
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Funding
- C1 Gas Refinery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and and ICT [2015M3D3A1A01064900]
- National Research Foundation of Korea [2015M3D3A1A01064900] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Catalytic descriptors were studied to design optimum catalysts for the oxidative coupling of methane (OCM) by combining density functional theory (DFT) calculations and actual reaction experiments. SrTiO3 perovskite catalysts, selected for OCM, were modified using metal dopants, and their electronic structures were calculated using the DFT method. The CH3 adsorption energy E-ads(CH3) and the oxygen vacancy formation energy E-f(vac) exhibited volcano-type correlations with the C-2(+) selectivity and O2- consumption for the formation of COx, respectively. The optimum catalytic activity, represented by the C-2(+) selectivity, was obtained for E-ads(CH3) = -2.0 to -1.5 eV, indicating that overly strong adsorption of methyl radicals (or easily dissociated C-H bonds of methane) and relatively insufficient oxygen supplementation to the catalyst surface improve deep oxidation to CO and CO2. Praseodymium (Pr)- and neodymium (Nd)-doped SrTiO3 catalysts confirm the DFT-predicted optimum electronic structure of the OCM catalysts. (C) 2019 Elsevier Inc. All rights reserved.
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