eprintid: 11814
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/01/18/14
datestamp: 2023-11-10 03:26:21
lastmod: 2023-11-10 03:26:21
status_changed: 2023-11-10 01:16:12
type: article
metadata_visibility: show
creators_name: Hassan, M.A.
creators_name: Miyao, T.
creators_name: Komiyama, M.
title: Catalytic oxidative coupling of methane in supercritical water: Investigations on a catalytically active species
ispublished: pub
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
note: cited By 6
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.
date: 2019
publisher: Elsevier B.V.
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85054344899&doi=10.1016%2fj.supflu.2018.07.001&partnerID=40&md5=6a85d655fa2aba2573d2986444ba3681
id_number: 10.1016/j.supflu.2018.07.001
full_text_status: none
publication: Journal of Supercritical Fluids
volume: 144
pagerange: 8-13
refereed: TRUE
issn: 08968446
citation:   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.  ISSN 08968446