Reaction Routes for Methane Conversion on Transition Metals at Low Temperature

Things go better with coke: the beneficial role of carbonaceous deposits in heterogeneous catalysis

“…164 The role of carbon, either from coke or as a catalyst, in this process is as an oxygen radical generator, causing the formation of dimers and phenolic polymers by oxidative coupling, which ultimately leads to the deactivation of the catalyst through pore blockage. 20,21 In studies of OCM over metal catalysts using 13 C-labelled methane it was shown that the carbon formed was a reactive intermediate in methane oligomerisation and methane-alkene coupling reactions; 116,165 coke deposits are likely to participate in a similar way. OCM continues to be a topic of contemporary interest, e.g.…”

Non-Oxidative Coupling Reaction of Methane to Ethane and Hydrogen Catalyzed by the Silica-Supported Tantalum Hydride: (≡SiO)2Ta−H

“…Noteworthy, previous works on the NOCM reaction involved only supported metal particles − ,− and often proceeded at relatively high temperatures in a two-stage process: methane dissociative chemisorption and products liberation under hydrogen, in order to bypass the severe thermodynamic limitations. However, the final yield relative to methane remains limited and the time necessary to switch from one stage to the other one is still too long for an industrial application.…”