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Rate and Selectivity Enhancements Mediated by OH Radicals in the Oxidative Coupling of Methane Catalyzed by Mn/Na 2 WO 4 /SiO 2
Author(s) -
Takanabe Kazuhiro,
Iglesia Enrique
Publication year - 2008
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200802608
Subject(s) - oxidative coupling of methane , radical , methane , catalysis , chemistry , oxygen , reactivity (psychology) , selectivity , oxide , homogeneous , oxygen atom , atomic oxygen , photochemistry , inorganic chemistry , coupling (piping) , atom (system on chip) , oxidative phosphorylation , molecule , materials science , organic chemistry , physics , thermodynamics , medicine , alternative medicine , pathology , computer science , metallurgy , embedded system , biochemistry
Radically Improved : OH radicals formed by quasi‐equilibrated steps on oxide surfaces introduce homogeneous pathways that lead to higher rates and C 2 yields in oxidative methane coupling relative to those attained by CH 4 activation with chemisorbed oxygen (see picture; O*: dissociated oxygen atom; R: abstractor). The reactivity of OH . leads to a weaker influence of the CH bond energies on the relative rates of H abstraction from CH 4 , C 2 H 6 , and C 2 H 4 .