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Catalytic activity was measured using a continuous flow fixed-bed micro-reactor at atmospheric pressure. In a typical experiment, the system was first purged with high purity N2 gas and then a gas mixture of CO/O2/N2 (1:10:89) was introduced into the reactor containing 50 mg of AuNPs/CeO2-NTs (1 wt % Au loading) at a flow rate of 33.6 mL/min. Gas samples were analyzed with an online infrared gas analyzer, which simultaneously detects CO and CO2 with a resolution of 10 ppm. The results were further confirmed with a Gas Chromatograph.
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