Effect of Pt addition to Ni/La0.7Sr0.3AlO3−δ catalyst on steam reforming of toluene for hydrogen production

• Hydrogen production by steam reforming of toluene as a model tar was investigated Pt/Ni/La0.7Sr0.3AlO3−δ catalyst showed high catalytic activity even without pre-reduction.
• Pt and Ni formed adjacent/alloy structures revealed by XAFS/STEM/XPS.
• Electron donation from Pt to Ni affected the reducibility of Ni on the catalyst.
• Coke accumulation on the catalyst was suppressed by Pt addition thanks to the dilution effect..

Pt/Ni/La0.7Sr0.3AlO3−δ (Pt/Ni/LSAO) catalyst showed high catalytic activity and low coke formation for hydrogen production by steam reforming of toluene, even without pre-reduction. STEM-EDX and XAFS analyses revealed that Pt and Ni formed adjacent or alloy structure. Electron donation from supported Pt to Ni was observed by XPS observation, and the improvement of reducibility of Ni by Pt addition was observed by H2-TPR. Catalytic activity of the reduced Ni was brought by the PtNi interaction. The impregnation order of Pt and Ni affected the catalytic activity and the amount of coke formation due to the difference of the structure of supported metals. Dilution effects of Pt on Ni metal and the contact between Ni and LSAO support apparently affect the suppression of coke formation.

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