An Alumina-Supported Ni-La-Based Catalyst for Producing Synthetic Natural Gas
AbstractLaNi5, known for its hydrogen storage capability, was adapted to the form of a metal oxide-supported (γ-Al2O3) catalyst and its performance for the Sabatier reaction assessed. The 20 wt % La-Ni/γ-Al2O3 particles were prepared via solution combustion synthesis (SCS) and exhibited good catalytic activity, achieving a CO2 conversion of 75% with a high CH4 selectivity (98%) at 1 atm and 300 °C. Characteristics of the La-Ni/γ-Al2O3 catalyst were identified at various stages of the catalytic process (as-prepared, activated, and post-reaction) and in-situ DRIFTS was used to probe the reaction mechanism. The as-prepared catalyst contained amorphous surface La–Ni spinels with particle sizes <6 nm. The reduction process altered the catalyst make-up where, despite the reducing conditions, Ni2+-based particles with diameters between 4 and 20 nm decorated with LaOx moieties were produced. However, the post-reaction catalyst had particle sizes of 4–9 nm and comprised metallic Ni, with the LaOx decoration reverting to a form akin to the as-prepared catalyst. DRIFTS analysis indicated that formates and adsorbed CO species were present on the catalyst surface during the reaction, implying the reaction proceeded via a H2-assisted and sequential CO2 dissociation to C and O. These were then rapidly hydrogenated into CH4 and H2O. View Full-Text
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Rivero-Mendoza, D.E.; Stanley, J.N.G.; Scott, J.; Aguey-Zinsou, K.-F. An Alumina-Supported Ni-La-Based Catalyst for Producing Synthetic Natural Gas. Catalysts 2016, 6, 170.
Rivero-Mendoza DE, Stanley JNG, Scott J, Aguey-Zinsou K-F. An Alumina-Supported Ni-La-Based Catalyst for Producing Synthetic Natural Gas. Catalysts. 2016; 6(11):170.Chicago/Turabian Style
Rivero-Mendoza, Daniel E.; Stanley, Jessica N.G.; Scott, Jason; Aguey-Zinsou, Kondo-François. 2016. "An Alumina-Supported Ni-La-Based Catalyst for Producing Synthetic Natural Gas." Catalysts 6, no. 11: 170.
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