Oxidative steam reforming of vacuum residue for hydrogen production

► Coke formation predominates over SR at high temperature. ► In OSR, steam/carbon and oxygen/carbon molar ratios are key parameters. ► Increase in steam/carbon molar ratio cannot completely inhibit coke formation. ► During reforming Pt catalyst deactivates due to coke formation. ► Nearly complete regeneration of Pt catalyst was possible by blowing at 1173 K.