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

Many gold catalysts have been actively surveyed, but Au/SiO2 catalysts that are highly active for CO oxidation still remain evasive. In this work, gold nanoparticles well dispersed on Cab-O-Sil fumed SiO2 were prepared using Au(en)2Cl3 (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/SiO2-based catalysts.

Graphical abstractHighly dispersed gold nanoparticles on Cab-O-Sil fumed SiO2, which were prepared using Au(en)2Cl3 (en = ethylenediamine) as the precursor, were found to be highly active for CO oxidation below 0 °C. Effects of catalyst pretreatment, gold loading, post-treatment, catalyst deactivation, storage, regeneration, and surface coating of other metal oxides were systematically studied.Figure optionsDownload full-size imageDownload as PowerPoint slide