Particle Size Effects of Carbon Supported Nickel Nanoparticles for High Pressure CO ₂ Methanation

Supported nickel nanoparticles are promising catalysts for the methanation of CO2 . The role particle size on activity and selectivity in this reaction is a matter debate. We present study metal effects catalytic stability, selectivity, using graphitic carbon catalysts. Increasing Ni from 4 to 8 nm led higher activity, both per gram normalized surface area. However, apparent activation energy remained same (~105 kJ mol-1 ). Comparing experiments at atmospheric 30 bar pressure demonstrates importance testing under industrially relevant pressures; highest obtained high conversions pressures. Finally, was size-dependent. largest particles were not only most active but also selective methane. With work we contribute ongoing debate about methanation.