Evaluation of carbon monoxide oxidation over CeO2/Co3O4 catalysts: Effect of ceria loading

✍ Scribed by Chih-Wei Tang; Ming-Chih Kuo; Chin-Jung Lin; Chen-Bin Wang; Shu-Hua Chien

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 452 KB
• Volume: 131
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/j.cattod.2007.10.026

✦ Synopsis

Modification of cobaltic oxide (obtained from the reduction of high-valence cobalt oxide and assigned as R230, S BET = 100 m 2 g À1 ) with different loading of ceria was proceeded using the impregnation method (assigned as CeX/R230, X = 4, 12, 20, 35 and 50 wt%). The CeX/R230 catalysts were characterized by X-ray diffraction (XRD), nitrogen adsorption at À196 8C, temperature-programmed reduction (TPR) and transmission electron microscopy (TEM). Their catalytic activities towards the CO oxidation were studied in a continuous flow micro-reactor. The results revealed that the optimal modification, i.e., Ce20/R230, can increase the surface area (S BET = 109 m 2 g À1 ) of cobaltic oxide, further weaken the bond strength of Co-O and lower the activation of CO oxidation among CeX/R230 catalysts due to the combined effect of cobaltic oxide and ceria. The Ce20/R230 catalyst exhibited the best catalytic activity in CO oxidation with T 50 (temperature for 50% CO conversion) at 88 8C.