Abstract
By combining dielectric barrier discharge plasma and external heating,
we exploit a two-stage hybrid plasma-thermal system (HPTS), i.e., a
plasma stage followed by a thermal stage, for direct non-oxidative
coupling of CH4 to C2H4 and H2, yielding a CH4 conversion of ca. 17 %.
In the two-stage HPTS, the plasma first converts CH4 into C2H6 and C3H8,
which in the thermal stage leads to a high C2H4 selectivity of ca. 63 %
by pyrolysis, with H2 selectivity of ca. 64 %.