Effect of ethane and ethylene on catalytic non oxidative coupling of methane

Abstract

The effect of addition of ethane and ethylene (C2) on methane coupling at 1000°C was investigated. A Fe/SiO2 catalyst was used to determine the contributions of catalytic as well as...

Technoeconomic Evaluation of the Industrial Implementation of Catalytic Direct Nonoxidative Methane Coupling

“…Catalyst performance data, concerning both activity and selectivity, have been taken from the original work on the Fe©SiO 2 catalyst by Guo et al It must however be noted that other papers − ,,, reporting on this catalyst showed a broader product range of minor products, including ethane, acetylene, C 3–5 olefins, and alkylbenzenes. The selectivity to these products becomes negligible at a higher methane conversion and is therefore not included to reduce complexity. In this study, a standard composition for dry natural gas in the United States is used, presented in Table . , It is assumed that all hydrocarbons are alkanes.…”

“…Guo et al showed that the addition of small amounts of ethane to the reaction mixture will both cause a significant increase in reaction rate and co-produce coke. Ethane and ethylene are potent free-radical initiators, ,− significantly enhancing methane conversion. It can be safely assumed, based on experimental data, that increasing the space velocity can largely prevent coke formation due to C 2+ hydrocarbons while keeping the same conversion as a consequence of increasing reaction rate.…”

“…Ethane and ethylene are potent free-radical initiators, ,− significantly enhancing methane conversion. It can be safely assumed, based on experimental data, that increasing the space velocity can largely prevent coke formation due to C 2+ hydrocarbons while keeping the same conversion as a consequence of increasing reaction rate. However, it is unlikely that coke formation can be completely prevented by tuning the space velocity.…”

Phosphotungstic acid catalysed bioethylene synthesis under industrially relevant conditions

“…Two main direct routes that have been studied for decades are the oxidative and the non-oxidative coupling of methane (OCM and NCM), which take place at high temperatures, 750 and 1000 °C, respectively. 8,9 The first one has been considered through several approaches, including co-feeding of O 2 , chemical coupling and membrane technologies. For the NCM, technologies under development include thermal pyrolysis, catalytic NCM, which can be coupled with H 2 -permeable membranes, and plasma.…”