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

• Published in: Applied catalysis. A, General Vol. 326; no. 1; pp. 89 - 99
• Main Authors: HAOGUO ZHU, ZHEN MA, CLARK, Jason C, ZHENGWEI PAN, OVERBURY, Steven H, SHENG DAI
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier 30-06-2007
• Subjects: Catalysis; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Gold; Catalytic reaction; Nanoparticle; CO oxidation; Transition metal; Precursor; Silica; Nanoparticles; Heterogeneous catalysis; Gold catalysis; Oxidation; Carbon monoxide; Au(en)2Cl3; Catalyst; Low temperature
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2007.04.004

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 deg 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.