Metal cation-acidic proton bifunctional catalyst for methane activation:conversion of ~(13)CH_4 in the presence of ethylene over metal cations-loaded H-ZSM-5

摘要

It has been investigated that ~(13)CH_4 reacts with reacts with ethylene over metal cations such as indium cations-loaded H-ZSM-5 to form singly ~(13)C-labeled propylene (~(13)C~(12)C_2H_6)and hdyrogen at 673 K.The heterolytic dissociation of C-H bond in methane presumably proceeds by the reaction of methane with metal cations for the formation of CH_3~(delta+)and metal hydride species,thus allowing the reaction of CH_3~(delta+)with ethylene to form propylene and acidic protons.Metal cations are regenerated by the rreaction of silver-hydride species with acidic protons,and hydrogen is simultaneously formed.Thus,bifunctionality of metal cations and acidic protons is essential for the activation of methane.