Ru metal was very highly dispersed on the Mg3(Al)O mixed oxide.
The order of Ru dispersion was Ru/Mg3(Al)O > Ru/MgO > Ru/MgAl2O4 > Ru/γ-Al2O3.
Ru/Mg3(Al)O exhibited excellent catalytic stability for CH4-CO2 reforming.
Strong metal-support interaction existed between Ru and Mg3(Al)O.