Activated carbon supported molybdenum and tungsten carbides for hydrotreatment of fatty acids into green diesel

The activated carbon supported Mo 2 C and W 2 C were synthesized successfully for hydrotreatment of fatty acids to produce diesel-like hydrocarbons. The carburization temperature, carburization gas as well as metal loading amount were studied. High carburization temperature was feasible for W 2 C/AC, but not for Mo 2 C/AC because it resulted in agglomeration of molybdenum compound and destruction of catalyst. Under hydrotreatment condition (360 °C, H 2 3.0 MPa, 3.0 h) the conversion achieved 96.01% over Mo 2 C/AC prepared at 700 °C and 54.88% over W 2 C/AC prepared at 900 °C respectively. During carburization both flowing nitrogen and hydrogen were proper for formation of W 2 C/AC, while only flowing hydrogen was appropriate for Mo 2 C/AC. The hydrotreatment parameters (reaction temperature and reaction time) were also investigated. The high reaction temperature and long reaction time facilitated the conversion of fatty acids, meanwhile the high reaction temperature simultaneously improved the cracking degree of products.