TY  - JOUR
AV  - none
TI  - Catalytic oxidative coupling of methane in supercritical water: Investigations on a catalytically active species
SP  - 8
N1  - cited By 6
SN  - 08968446
PB  - Elsevier B.V.
EP  - 13
KW  - Batch reactors; Binding energy; Catalysts; Manganese oxide; Methane; Petroleum prospecting; Silica; Sodium compounds; Transition metal oxides; Transition metals; Zirconia
KW  -  Active surfaces; Catalytically active species; Feed concentration; Methane coupling; Oxidative coupling of methane; Oxidative coupling of methanes (OCM); Supercritical water; ZrO2 synergy
KW  -  Molecular oxygen
ID  - scholars11814
N2  - 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. 0.5â??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 MnO2â??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, 526â??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.
Y1  - 2019///
VL  - 144
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85054344899&doi=10.1016%2fj.supflu.2018.07.001&partnerID=40&md5=6a85d655fa2aba2573d2986444ba3681
JF  - Journal of Supercritical Fluids
A1  - Hassan, M.A.
A1  - Miyao, T.
A1  - Komiyama, M.
ER  -