Non‐oxidative Coupling of Methane to Ethylene Using Mo 2 C/[B]ZSM‐5

Methane non‐oxidative coupling to ethylene was investigated on Mo 2 C/[B]ZSM‐5 catalyst at 923 K and atmospheric pressure. In contrast to Mo 2 C/[Al]ZSM‐5 catalysts for methane aromatization, this material exhibits very high ethylene selectivity (>90 %) and low aromatics (benzene and naphthalene) selectivity. The much weaker Brønsted acidity of [B]ZSM‐5 leads to a slow rate of ethylene oligomerization. The stability of the catalyst is greatly enhanced with 93 % of the initial reaction rate remaining after 18 h of time on stream. In‐situ UV/VIS spectra indicate that prior to carburization, mono/binuclear Mo oxides are initially well dispersed onto the zeolite support. Mo carbides clusters, formed during carburization with methane, appear similar to clusters formed in [Al]ZSM‐5, as indicated by the X‐ray Absorption Spectroscopy (XAS) data.