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Selective Oxidation of Methane to Methanol over ZSM‐5 Catalysts in Aqueous Hydrogen Peroxide: Role of Formaldehyde
Author(s) -
AlShihri Saeed,
Richard Christian J.,
Chadwick David
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201601563
Subject(s) - formic acid , chemistry , formaldehyde , hydrogen peroxide , catalysis , methane , methanol , aqueous solution , anaerobic oxidation of methane , product distribution , inorganic chemistry , zsm 5 , partial oxidation , photochemistry , organic chemistry , zeolite
The selective oxidation of methane in aqueous hydrogen peroxide over ZSM‐5 catalysts with different Si/Al ratios has been investigated. Methyl hydroperoxide was confirmed as the initial product of methane oxidation by a study of product distribution versus reaction time in agreement with previous work. Formaldehyde was identified as an intermediate in the oxidation reaction pathway from MeOOH to formic acid and ultimately CO 2 . Hydrogen evolution during the oxidation of methane is reported for the first time. Oxidation of the HCHO intermediate to formic acid was demonstrated to be the source of the evolved hydrogen. HCHO appeared to be the source of low levels of soluble polyoxomethylene. Higher productivity of liquid oxygenated products is reported compared to previous work.