Gold-supported tin dioxide nanocatalysts for low temperature CO oxidation: preparation, characterization and DRIFTS study

• Published in: Reaction kinetics, mechanisms and catalysis Vol. 108; no. 2; pp. 403 - 416
• Main Authors: Huang, Jing, Xue, Chengjin, Wang, Baofeng, Guo, Xianzhi, Wang, Shurong
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01-04-2013
• Subjects: Carbon monoxide; Catalysis; Catalysts; Chemistry; Chemistry and Materials Science; Gold; Industrial Chemistry/Chemical Engineering; Nanomaterials; Nanostructure; Oxidation; Physical Chemistry; Tin dioxide; Tin oxides; Nanocatalysts; Gold/tin dioxide; DRIFTS; Low temperature CO oxidation
• ISSN: 1878-5190; 1878-5204
• DOI: 10.1007/s11144-012-0515-4

A series of gold-supported tin dioxide (Au/SnO
2
) nanocatalysts were prepared by a deposition–precipitation method using SnO
2
powders prepared by the sol–gel dialytic processes as supports, and were characterized by means of XRD and XPS techniques. The catalytic properties of the prepared Au/SnO
2
nanocatalysts were evaluated by low-temperature carbon monoxide oxidation using a microreactor-GC system. The results showed that the catalytic behavior of the Au/SnO
2
system was remarkably influenced by the deposition pH, the reaction solution concentration and the thermal pretreatment temperature of the catalyst. The DRIFTS study results indicated that CO adsorbed on the Au/SnO
2
catalyst reacted with support surface lattice oxygens and hydroxyl groups to form oxidation products, i.e., CO
2
–
, HCOO
–
, CO
3
2–
, HCO
3
–
and CO
2
, and the gas phase oxygen acted as an activator for the reaction of CO with support surface lattice oxygens and hydroxyl groups.