简介：

简介：

简介：Agreenprocessfortheoxygen-freeconversionofmethanetohigh-concentrationethyleneandhydrogeninaplasina-followed-by-catalyst(PFC)reactorispresented.Withoutanycatalystsandwithpuremethaneusedasthefeedgas,astablekilohertzsparkdischargeleadstoanacetyleneyieldof64.1%,ethyleneyieldof2.5%andhydrogenyieldof59.0%with80.0%ofmethaneconversionatamethaneflowrateof50cm~3/minandaspecificinputenergyof38.4kJ/L.Intheeffluentgasfromastablekilohertzsparkdischargereactor,theconcentrationsofacetylene,ethyleneandhydrogenwere18.1%,0.7%and66.9%,respectively.WhencatalystsPd-Ag/Si02wereemployedinthesecondstagewithdischargeconditionssameasinthecaseofplasmaalone,thePFCreactorprovidesanethyleneyieldof52.1%andhydrogenyieldof43.4%.TheconcentrationsofethyleneandhydrogenintheeffluentgasfromthePFCreactorwerefoundtobeashighas17.1%and62.6%,respectively.Moreover,noacetylenewasdetectedintheeffluentgas.Thismeansthatahighconcentrationofethyleneandoxygen-freehydrogencanbeco-produceddirectlyfrommethaneinthePFCreactor.