Institutional Repository of Dalian Institute of Chemical Physics, CAS
Not a member yet
45557 research outputs found
Sort by
Activity promotion of anti-sintering AuGMgGa(2)O(4) using ceria in the water gas shift reaction and catalytic combustion reactions
No full textHeterogeneous 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 spinet support upon sintering at high temperatures. Herein, we report the catalytic activity of anti-sintering AuGMgGa(2)O(4) for use in water gas shift reaction (WGSR) and catalytic combustion reactions, and the promoting effect of ceria. Upon adding ceria to 800 degrees C-aged AuGMgGa(2)O(4), the CO conversion in the WGSR was increased from similar to 1.5% to similar to 34.0% at 450 degrees C, and the "light-off" temperatures (T-50) for methane combustion and CO oxidation were decreased by similar to 80 and similar to 100 degrees C, respectively. Characterizations using XRD, HAADF-STEM, EDS mapping, H-2-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 O-2 and the Au NPs toward activating CO or CH4. These 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. (C) 2019, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved
