Selective Oxidation of Methane to Formaldehyde over a Silica-Supported Cobalt Single-Atom Catalyst

Junya Ohyama, Daiki Abe, Airi Hirayama, Hiroki Iwai, Yuka Tsuchimura, Kazuki Sakamoto, Momoka Irikura, Yuri Nakamura, Hiroshi Yoshida, Masato Machida, Shun Nishimura, Tomokazu Yamamoto, Syo Matsumura, Keisuke Takahashi

研究成果: ジャーナルへの寄稿学術誌査読

6 被引用数 (Scopus)

抄録

Catalytic oxidation of methane to formaldehyde and methanol has attracted attention because of its advantage in energy efficiency over the conventional multistep reaction process involving endothermic steam reforming of CH4; however, it is challenging to selectively obtain the partial oxidation products in the direct oxidation of CH4. In the present study, Co/SiO2 with various Co loadings was tested for the CH4/O2/H2O gas flow reaction. As a result, Co/SiO2 with a low loading of ≤0.1 wt % showed high selectivity for the partial oxidation reaction and mainly produced HCHO, while Co/SiO2 with high Co loadings proceeded to complete oxidation. Structural analysis using X-ray absorption fine-structure spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and scanning transmission electron microscopy suggested that single Co atoms generated at low Co loadings were effective in the selective oxidation of CH4 to HCHO, while Co3O4 nanoparticles generated at high Co loadings promoted the complete oxidation.

本文言語英語
ページ(範囲)1785-1792
ページ数8
ジャーナルJournal of Physical Chemistry C
126
4
DOI
出版ステータス出版済み - 2月 3 2022

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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