摘要：Heterogeneous gold nanocatalysts have both inspired researchers with their unique catalytic performance and frustrated them due to the contradictions observed in their activities and stabilities.A recent breakthrough has shown that gold nanoparticles(NPs)can retain their catalytically active size over a MgGa2O4 spinel support upon sintering at high ***,we report the catalytic activity of anti-sintering AuGMgGa2O4 for use in water gas shift reaction(WGSR)and catalytic combustion reactions,and the promoting effect of *** adding ceria to 800℃-aged AuGMgGa2O4,the CO conversion in the WGSR was increased from ~1.5% to ~34.0% at 450 ℃,and the “light-off” temperatures(T50)for methane combustion and CO oxidation were decreased by ~80 and ~100 ℃,*** using XRD,HAADF-STEM,EDS mapping,H2-TPR,XPS,and DRIFTs confirmed the proximate contact of Au with ceria and their significant synergistic effect,which thereby combined the benefits of ceria toward the dissociation of H2O or O2 and the Au NPs toward activating CO or *** results show that this stepwise stabilization-activation strategy is efficient for rationally constructing stable and active gold nanocatalysts,which may open up possibilities for the wide application of gold nanocatalysts at elevated temperatures.