Ammoxidation of 3-Picoline over V₂O₅/TiO₂ Catalysts: Effects of TiO₂ Supports on the Catalytic Performance

Abstract:

A series of V₂O₅/TiO₂ catalysts were prepared by wet impregnation, and these prepared catalysts were characterized by XRD, N2 adsorption-desorption, H2-TPR, and TEM techniques and used in the selective ammoxidation of 3-picoline to 3-cyanopyridine. The effects of TiO2 supports on the catalytic properties of the resulting catalysts for the ammoxidation of 3-picoline to 3-cyanopyridine were investigated in detail. It is found that the V5+/V4+ transformation during ammoxidation is more favorable than the V5+/V3+ transformation for the selective ammoxidation of 3-picoline to 3-cyanopyridine. The V₂O5/TiO₂ catalysts prepared from the nanosized TiO₂ particles as supports show a high activity for the direct oxidation of 3-picoline by air, resulting Subscript text Subscript textin a low selectivity for 3-cyanopyridine. This could be due to the fact that the active species vanadium oxides could be only supported on the external surface of the nano-sized TiO₂ particles with very minor contact area, leading to the weak interactions between active species and support.

• Periodical: Advanced Materials Research (Volumes 396-398)
• Pages: 791-797
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.396-398.791
• Online since: November 2011
• Authors: Fu Min Zhang, Fei Chen, Qiang Xiao, Yi Jun Zhong, Wei Dong Zhu
• Keywords: 3-Cyanopyridine, 3-Picoline, Ammoxidation, V₂O₅/TiO₂ Catalysts, Vitamin B

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