Toluene combustion on γ-Al2O3–CeO2 catalysts prepared from boehmite and cerium nitrate

✍ Scribed by G. Del Angel; J.M. Padilla; I. Cuauhtémoc; J. Navarrete

• Book ID: 103834794
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 260 KB
• Volume: 281
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/j.molcata.2007.08.017

✦ Synopsis

␥-Al 2 O 3 -Ce catalysts were obtained by the impregnation of boehmite with cerium nitrate at different Ce contents (1, 5, 10, 20 wt%) and tested in the catalytic combustion of toluene. The catalysts annealed at 650 • C showed a diminution of the BET specific surface areas as a function of the cerium content. At low cerium content, the XRD spectra showed the ␥-Al 2 O 3 phase, whereas at high cerium content, the ␥-Al 2 O 3 phase and cerium oxide were observed. A diminution of the Lewis acidity was shown by the FTIR-pyridine absorption spectra. Both Ce 3+ and Ce 4+ in variable proportions were observed by XPS. It has been found that the activity for the toluene combustion can be related to the C 4+ /Ce 3+ ratio obtained in the various catalysts. The higher the C 4+ /Ce 3+ ratio is the higher the toluene combustion activity.