100° Temperature Reduction of Wet Methane Combustion: Highly Active Pd–Ni/Al₂O₃ Catalyst versus Pd/NiAl₂O₄

The crucial role of Ni mode addition to Pd catalysts for low-temperature wet methane combustion is addressed, resulting in excellent performance of ultralow-Ni-containing catalysts versus inactive nickel–alumina spinel. Traditional impregnation–calcination and colloidal techniques of bimetallic catalyst preparation yield monometallic Pd particles on a binary NiAl 2 O 4 support and Pd and Ni nanoparticles on the parent Al 2 O 3 support, respectively. The catalyst is potentially valuable for natural gas catalytic combustion technologies because it decreases the required temperature for complete methane combustion in 5% water presence in the feed by 100 degrees versus monometallic Pd.