Biogas reforming over BaTi1−xSnxO3-supported Ni-based catalysts recovered from spent Ni-metal-hydride batteries

• Ni-based metal (wNi) recovered from spent Ni-metal-hydride batteries was available for a catalyst.
• The supported wNi catalyst (wNi/BaTi0.8Sn0.2O3) exhibited high reforming performance for model biogas at 800 °C.
• BaTi0.8Sn0.2O3 functioned as an inhibitor, depressing carbon deposition.
• Model biogas is converted with the dry and steam reforming reactions in the present conditions.

BaTi1−xSnxO3-supported Ni-based catalysts recovered from spent Ni-metal-hydride (Ni-MH) batteries [wNi/BaTi1−xSnxO3 (x = 0.0, 0.2, 0.4, 0.6, and 1.0)] were prepared. Their catalytic activities for model biogas reforming reactions were examined at 800 °C and compared with that of wNi/γ-Al2O3. According to the results, wNi/BaTi0.8Sn0.2O3 exhibited high reforming performance and high sustainability among the catalysts tested. wNi/γ-Al2O3 exhibited unsustainability due to carbon deposition, although its performance was excellent for a short time. BaTi0.8Sn0.2O3 functioned as an inhibitor, depressing carbon deposition. This function was likely due to the mobile oxide ions and alkaline earth oxides in the catalyst supports.

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