The role of support on the performance of platinum-based catalysts for the total oxidation of polycyclic aromatic hydrocarbons

✍ Scribed by Edwin Ntainjua N.; Albert F. Carley; Stuart H. Taylor

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 332 KB
• Volume: 137
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/j.cattod.2007.10.116

✦ Synopsis

A range of Pt supported catalysts have been evaluated for the total oxidation of naphthalene. Catalysts contained 0.5 wt% Pt on a range of supports (g-Al 2 O 3 , TiO 2 , SiO 2 , SnO 2 , and CeO 2) . SiO 2 was the best support, the 0.5%Pt/SiO 2 catalyst showing a conversion to carbon dioxide of over 90% at 200 8C (100 vppm naphthalene, GHSV = 45,000 h À1 ). The catalyst also showed a considerably higher activity (in the temperature range 100-175 8C) than a CeO 2 catalyst recently reported to be one of the most effective catalysts for the total oxidation of naphthalene. The high activity of the 0.5%Pt/SiO 2 catalyst has been attributed to the relatively low dispersion and relatively large size of Pt particles. Furthermore, due to the acidic and non-reducible nature of the SiO 2 , platinum is expected to have a weak interaction with the support. XPS data identified the presence of Pt 0 on the surface and this contributes to the high activity.