Surface acidic and redox properties of V-Zr-O catalysts for the selective oxidation of toluene to benzaldehyde

✍ Scribed by Jiazhen Ge; Mingwei Xue; Qing Sun; Aline Auroux; Jianyi Shen

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 437 KB
• Volume: 278
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/j.molcata.2007.09.005

✦ Synopsis

A series of V-Zr-O (V 2 O 5 -ZrO 2 ) complex oxides were prepared by the sol-gel method. The phases of the samples as detected by the X-ray diffraction depended on the content of V 2 O 5 in the complex oxides. ZrV 2 O 7 was found to be the main phase in the 50% V 2 O 5 -ZrO 2 . The results of temperature programmed reduction showed that the complex oxides V-Zr-O were easier reduced than the single oxides ZrO 2 and V 2 O 5 , indicating the increased redox ability of the complex oxides. On the other hand, the complex oxides with surface ZrV 2 O 7 exhibited the significantly lower surface acidity and relatively stronger redox ability, and thus, the better reactivity for the selective oxidation of toluene to benzaldehyde and benzoic acid.