Synthesis of novel catalysts for hydrodeoxygenation of bio-oil: guaiacol as a model component

摘要

In this work, NiMo/Support catalysts have been prepared by impregnation technique and evaluated for hydrodeoxygneation (HDO) reaction of guaiacol (GUA) aiming at the identification of active catalysts. Among various catalysts, NiMo/TiO_2 was chosen to understand the influence of reaction parameters, such as temperature, reaction time, H_2 pressure, and quantity of the catalyst. The influence of the metal components on guaiacol conversion is determined by comparing mono (Ni and Mo) metals deposited TiO_2. These results signify the alloying nature of metal components. GCMS results showed that phenol is a major component in all the conditions. As there is an increase in the temperature (200, 250, 300, 350°C), reaction time (1, 5, 8, 24 h), H_2/guaiacol molar feed ratio (0, 1:2, 1:1, and 2:1), and catalyst amount (0, 25, 50, 100 mg), the conversion has increased significantly while maintaining the high selectivity to HDO products without ring opening reactions. Under optimized conditions (350°C and 2:1 of H_2:guaiacol ratio), 98% guaiacol is converted on NiMo/TiO_2 resulting phenol, poly methyl substituted phenols, and traces of cyclohexanone and benzene. It is remarkable that a low amount of catechol dimethyl ether and no indication of catechol and creosol were detected.