Oxidative amination of 2-cyclohexenone with aniline to N- aryl aniline over supported vanadium incorporated hetropoly tungstate catalysts

Vanadium is substituted into the primary structure of tungstophosphoric acid and subsequently dispersed on different supports. The physicochemical properties of vanadium-containing tungstophosphoric acid (TPAV) catalyst are derived from various spectroscopic methods. FT-IR and Raman analysis suggest that vanadium is present in the primary structure of heteropolytungstate. The TPAV retained its Keggin ion structure after dispersing on various supports. The catalytic activity of these catalysts was investigated for the oxidative amination of 2-cyclohexenone with aniline. The catalyst's activity depends on the number of vanadium ions present in the heteropolytungstate and the nature of the support. The silica-supported TPAV catalyst provides higher activity than niobia and zirconia supports. The catalyst’s elevated catalytic activity is due to its suitable acidity and redox properties. The reaction was studied under different conditions, and the optimal parameters were established. The catalyst is stable and shows consistent activity upon reuse.