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We report an Ag/SBA-15 catalyst with low loading (1.42wt%) that shows excellently high activity in CO oxidation at room temperature after oxygen pretreatment at 900°C. A 98% conversion of CO is achieved at 20°C (T98=20°C). An evaporation–deposition–diffusion mechanism for Ag/SBA-15 catalyst is proposed. The oxygen adsorbate-induced decrease in the surface-free energy at 900°C induces the evaporated...
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