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Catalytic oxidative coupling of methane in supercritical water: Investigations on a catalytically active species

Hassan, M.A. and Miyao, T. and Komiyama, M. (2019) Catalytic oxidative coupling of methane in supercritical water: Investigations on a catalytically active species. Journal of Supercritical Fluids, 144 . pp. 8-13.

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Abstract

Catalyst survey for oxidative coupling of methane (OCM) under supercritical water (SCW) environment at 658 K and 26 MPa using an 8.8-mL batch reactor and H2O2 as a molecular oxygen source was performed at a feed concentration molar ratios of 0.10 CH4/H2O and 0.15 O2/CH4. First and second transition metal oxides (V, Cr, Co, Cu, Zr and Mo) and some lanthanide oxides (La and Ce) showed relatively high OCM activities of ca. 0.5�1 C yield at a very low catalyst loading of 0.05 g. Exploration of catalyst formulations found that oxides of transition metals combined with ZrO2 were effective, with MnO2�ZrO2 showing a high synergy effect giving almost twice as much methane coupling yield. The OCM activity was correlated with the surface amount of a low 1s binding energy (O1s, 526�527 eV) oxygen species on the catalyst, as well as its energy separation from the lattice oxygen. In terms of this oxygen species, SCW-OCM activity of Mn/Na2WO4/SiO2, known as a good gas phase OCM catalyst and also showed a high turnover efficiency for SCW-OCM was further improved by supporting Mn/Na2WO4 on ZrO2 instead of SiO2. © 2018 Elsevier B.V.

Item Type:Article
Impact Factor:cited By 0
Uncontrolled Keywords:Batch reactors; Binding energy; Catalysts; Manganese oxide; Methane; Petroleum prospecting; Silica; Sodium compounds; Transition metal oxides; Transition metals; Zirconia, Active surfaces; Catalytically active species; Feed concentration; Methane coupling; Oxidative coupling of methane; Oxidative coupling of methanes (OCM); Supercritical water; ZrO2 synergy, Molecular oxygen
ID Code:22159
Deposited By: Ahmad Suhairi
Deposited On:28 Feb 2019 05:49
Last Modified:28 Feb 2019 05:49

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