Low-temperature CO oxidation on Au/fumed SiO2-based catalysts prepared from Au(en)2Cl3 precursor

Abstract Many gold catalysts have been actively surveyed, but Au/SiO 2 catalysts that are highly active for CO oxidation still remain evasive. In this work, gold nanoparticles well dispersed on Cab-O-Sil fumed SiO 2 were prepared using Au(en) 2 Cl 3 (en = ethylenediamine) as the precursor, and found to be very active for CO oxidation below 0 °C. The catalyst pretreatment via reduction and calcination, effect of gold loading, post-treatment in acidic and basic media, catalyst deactivation, storage, regeneration, and effect of surface modification by other metal oxides were explored. The results provide new perspective on the activation and promotion of active Au/SiO 2 -based catalysts.