Aqueous‐Phase Partial Oxidation of Methane over Pd−Fe/ZSM‐5 with O2 in the Presence of H2

Pd-Fe/ZSM-5 catalysts selectively oxidize CH₄ to methane oxygenates (CH₃OH, HCOOH, etc.) in water using in situ-generated H₂O₂. 0.28 %Pd–0.56 %Fe/ZSM-5 showed a stable catalytic performance in a continuous flow reactor.

Abstract

The selective oxidation of methane into methane oxygenates such as CH₃OH and HCOOH with O₂ is a promising technology for direct methane conversion. This study successfully demonstrates the partial oxidation of methane over Pd−Fe/ZSM-5 catalysts in water, where H₂O₂ was generated in situ from H₂ and O₂. A low Pd content is essential for preventing agglomeration of Pd nanoparticles, and intimate contact between Pd and Fe species is beneficial for achieving high yields of methane oxygenates. This one-body catalyst showed better catalytic performance than that of previously reported ones, especially at low temperatures. 0.28 %Pd–0.56 %Fe/ZSM-5 exhibited a stable catalytic performance in a continuous flow reactor.

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