Minimizing carbon deposition in plasma-induced methane coupling with structured hydrogenation catalysts  

作　　者：Nuria García-Moncada Toine Cents Gerard van Rooij Leon Lefferts 

机构地区：[1]Catalytic Processes and Materials(CPM),TNW Faculty,University of Twente,P.O.Box 217,7500 AE Enschede,The Netherlands [2]Sasol Holding Netherlands B.V.,7544 GG Enschede,The Netherlands [3]Nonequilibrium Fuel Conversion,DIFFER,5612 AJ Eindhoven,The Netherlands

出　　处：《Journal of Energy Chemistry》2021年第7期271-279,共9页能源化学（英文版）

基　　金：supported by the Innovation Fund for Chemistry of NWO,grant number 731.014.303;by SASOL。

摘　　要：The effect of temperature and hydrogen addition on undesired carbonaceous deposit formation during methane coupling was studied in DBD-plasma catalytic-wall reactors with Pd/Al2 O3, using electrical power to drive the reaction.Experiments with thin catalyst layers allowed comparison of the performance of empty reactors and catalytic wall reactors without significantly influencing the plasma properties.The product distribution varies strongly in the temperature window between 25 and 200℃Minimal formation of deposits is found at an optimal temperature around 75℃ in the catalytic-wall reactors.The selectivity to deposits was c.a.10% with only 9 mg of catalyst loading instead of 45% in the blank reactor,while decreasing methane conversion only mildly.Co-feeding H2 to an empty reactor causes a similar decrease in selectivity to deposits,but in this case methane conversion also decreased significantly.Suppression of deposits formation in the catalytic-wall reactor at 75℃ is due to catalytic hydrogenation of mainly acetylene to ethylene.In the empty reactor,H2 co-feed decreases conversion but does not change the product distribution.The catalytic-wall reactors can be regenerated with H2-plasma at room temperature,which produces more added-value hydrocarbons.

关 键 词：Dielectric barrier discharge(DBD)plasma-catalysis Structured reactor Methane coupling H_(2)co-feed Temperature optimization Carbon deposits 

分 类 号：O621.251[理学—有机化学]