Vanadium-magnesium oxides/KIT-6 catalysts for oxidative dehydrogenation of oleic acid to long-chain bio-olefins

This study investigated the effect of magnesium oxide (MgO) incorporation into vanadium-KIT-6 (VKIT-6) catalysts and vanadium oxide (VxOy) contents impregnated into MgO-KIT-6 catalysts on the catalytic activity in the oxidative dehydrogenation of oleic acid to generate long-chain bio-olefins (>= C10). The nMgO-VKIT-6 catalysts containing different Mg/V molar ratios (n = 0.00-1.50) were prepared by the hydrothermal process, while xV/ MgO-KIT-6 catalysts were synthesized via wet-impregnation method with different vanadium contents (x = 0-9 wt%). The Mg/V molar ratios in the nMgO-VKIT-6 catalysts and VxOy contents in the xV/MgO-KIT-6 catalysts strongly affected the catalytic performance and selectivity to the desired products. Both 0.50MgOVKIT-6 and 1 V/MgO-KIT-6 catalysts showed the best catalytic activity for the desired products with selectivity to olefins (alkenes + dienes) and aromatics of 52% and 20%, respectively. The high selective production to the desired products was ascribed to the highly dispersed and isolated VxOy species on the catalysts.

Automated summary

This study investigated the effect of MgO incorporation into VKIT-6 catalysts and VxOy contents impregnated into MgO-KIT-6 catalysts on the catalytic activity. It was found that the Mg/V molar ratios and VxOy contents strongly affected the catalytic performance and selectivity.