通電加熱可能アルマイト担体を用いたマルチ燃料対応水蒸気改質触媒の研究開発(<小特集>特殊反応場における化学反応,触媒反応の高性能化技術と化学反応器としての未来像)

概要

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The electrically heated alumina support in form of Al_2O_3/Alloy/Al_2O_3 was prepared from the anodization of a commercial plate-type Al/Cr-Ni-alloy/Al clad base material. With the anodic support, the Pt (Ru)-Ni/NiAl_2O_4/Al_2O_3/Alloy catalyst was prepared as the loading of 17.9 wt.% nickel, 0.079 wt% Pt or 0.05 wt% Ru with 148.25 m^2/g specific surface area. Our previous research revealed that the deactivation of the Ni catalyst resulted from the oxidation and sintering of metallic nickel with steam into inactive nickel aluminate NiAl_2O_4. As an approach, in view of the hydrogen spillover effect over noble metals such as Ru and Pt, trace Ru and/or Pt was doped, while an interfacial NiAl_2O_4 layer was introduced to anchor the top metallic nickel and suppress further sintering of nickel to maintain sufficient active metallic Ni. An excellent stability have been achieved over Pt (Ru)-Ni/NiAl_2O_4/Al_2O_3/Alloy in both continuous and DSS operations, while a pre-reduction with hydrogen is not essential. Furthermore, a multiple application of this catalyst was suggested because good performance was also achieved during SRK, SRE, POM and CMR reactions.
2012-09-20