Effect of steam treatments on surface morphology of NiAl foil catalysts

NiAl箔触媒の表面形態に対する水蒸気処理の効果

Xu, Y.*; Ma, Y.*; 櫻井 惇也*; 寺岡 有殿; 吉越 章隆 ; 出村 雅彦*; 平野 敏幸*

Xu, Y.*; Ma, Y.*; Sakurai, Junya*; Teraoka, Yuden; Yoshigoe, Akitaka; Demura, Masahiko*; Hirano, Toshiyuki*

We found that NiAl shows high catalytic activity for methanol decomposition and methane steam reforming as catalysts of hydrogen production. It is possible to enhance catalytic activity by modifying the NiAl foil by a pre-steam treatment followed by a reduction with H gas flow. We investigated the effect of the steam treatment and H reduction on the surface morphology of NiAl foil using synchrotron radiation X-ray photoemission spectroscopy. Although the metallic Ni2p and 2p peaks were detected before the steam treatment, the metallic Ni was significantly decreased and NiO appeared after the steam treatment, suggesting that most of the metallic Ni was oxidized. After the hydrogen reduction, the metallic Ni increased again, indicating that the NiO was reduced. These fine metallic Ni particles formed on the foil surface contribute to the enhanced catalytic activity.