Figure 1. XRD patterns for ( a ) nickel oxide (80%)-gold (20%) mechanical mixture reduced in situ in (5% H + 95% Ar) gas mixture at different temperatures, and ( b ) (80% 2 NiO-20% Au) mixture after partial oxidation of methane at 1153 K, after reduction in (5% + 95% Ar) at 1153 K and for 8%Ni-2% Au/Al O catalyst after reaction at 1153 K [25]. H 2 2 3 a