Elucidating the effects of individual components in K_xMnO_y/SiO₂and water on selectivity enhancement in the oxidative coupling of methane

Abstract

Until now a great number of various materials have been tested for the oxidative coupling of methane (OCM). On the basis of previous statistical analysis of OCM-related literature data, we...

Effects of N2O and Water on Activity and Selectivity in the Oxidative Coupling of Methane over Mn–Na2WO4/SiO2: Role of Oxygen Species

“…11−13 Very recently, we have demonstrated that the selectivity over other catalysts can also be enhanced through cofed water. 14,15 Our mechanistic and kinetic analysis suggests that the improvement should be due to H 2 O-assisted decomposition of surface biatomic oxygen species responsible for CO 2 formation.…”

Machine Learning-Aided Catalyst Modification in Oxidative Coupling of Methane via Manganese Promoter

“…Because such multiple synergy is expected to occur only slightly when using a conventional method, this new finding is anticipated as a predominant protocol for ML-aided catalyst investigation. Moreover, the role of Mn still remains an open question in OCM studies. ,, For instance, there has been reports on not only the positive effect in Mn-Na 2 WO 4 /SiO 2 and K x MnO y /SiO 2 but also the negative effect in the La 2 O 3 - or MgO-based catalyst . Because under the OCM the following occur: (i) C 2 production is influenced not only via the surface of catalyst but also via the outer surfaces (gas-phase) reaction. − (ii) The reaction usually performs under a high reaction temperature above melting points of metal components. − (iii) Synergy of components might be different from kinds of support, ,, and the effect of Mn in OCM under operation conditions is still a controversial subject.…”

“…Moreover, the role of Mn still remains an open question in OCM studies. ,, For instance, there has been reports on not only the positive effect in Mn-Na 2 WO 4 /SiO 2 and K x MnO y /SiO 2 but also the negative effect in the La 2 O 3 - or MgO-based catalyst . Because under the OCM the following occur: (i) C 2 production is influenced not only via the surface of catalyst but also via the outer surfaces (gas-phase) reaction. − (ii) The reaction usually performs under a high reaction temperature above melting points of metal components. − (iii) Synergy of components might be different from kinds of support, ,, and the effect of Mn in OCM under operation conditions is still a controversial subject. In other words, it is demonstrated that the HTS data-driven ML approach can aid catalyst investigation without scientists’ experiences and discover the positive fourth element (viz.…”

“…Moreover, the role of Mn still remains an open question in OCM studies. 39,43,44 For instance, there has been reports on not only the positive effect in Mn-Na 2 WO 4 /SiO 2 45 and K x MnO y /SiO 2 46 but also the negative effect in the La 2 O 3 -or MgO-based catalyst. 17 Because under the OCM the following occur: (i) C 2 production is influenced not only via the surface of catalyst but also via the outer surfaces (gas-phase) reaction.…”

“…47−50 (ii) The reaction usually performs under a high reaction temperature above melting points of metal components. 51−53 (iii) Synergy of components might be different from kinds of support, 17,45,46 and the effect of Mn in OCM under operation conditions is still a controversial subject. In other words, it is demonstrated that the HTS datadriven ML approach can aid catalyst investigation without scientists' experiences and discover the positive fourth element (viz.…”