Hydrogen production from bio-oil model compounds dry (CO2) reforming over Ni/Al2O3 catalyst

Abstract Bio-oil model compounds dry (CO 2 ) reforming for hydrogen production over Ni/Al 2 O 3 catalyst is presented in this paper. The research investigates the effects of reaction conditions such as temperature, weight hourly space velocity of the aqueous phase (WHSV), CO 2 to carbon in bio-oil ratio (CO 2 /Bio-oil) on hydrogen yield and products distribution. And also study the coke formation rates versus different reaction temperature and different CO 2 /Bio-oil ratio. Meanwhile analyze the types of carbon deposited on Ni/Al 2 O 3 catalyst. The experimental results show that, the optimum reaction temperature is 700 °C, CO 2 /Bio-oil is 0.75, WHSV is 0.9 h −1 , under these conditions, hydrogen yield and bio-oil model compounds conversion reach 88.19% and 96.87% respectively, the molar ratio of H 2 /CO reaches 1.08. The coke formation rate exists a maximum at 600 °C, higher temperature (>600 °C) and higher CO 2 /Bio-oil (>0.75) are all good for carbon elimination of dry reforming. The forms of carbon deposit on Ni/Al 2 O 3 catalyst are mainly filamentous carbon and graphitic carbon.