(583cv) Mixed Hydrocarbons Synthesis From Model Biomass-Derived Syngas Over Mo/HZSM-5 Bi-Functional Catalyst

Direct synthesis of high quality narrow range mixed hydrocarbons, such as gasoline, diesel and jet fuel from biomass-derived syngas (bio-syngas) through Biomass to Liquid via Fischer-Tropsch (BTL-FT) synthesis process has been regarded as a potential way to utilize biomass and to produce renewable transportation fuels. Mixed hydrocarbons synthesis from nitrogen rich model bio-syngas, a typical bio-syngas from biomass gasification with ambient air as the gasifying agent, over Mo/HZSM-5 bi-functional catalyst have been studied in a self-built continuous stainless steel fixed bed reactor with different operation variables. It was found that operation variables affected the catalytic performance greatly. Gasoline range hydrocarbons (mostly iso-paraffin, aromatics and naphthenes) can be produced from model bio-syngas over Mo/HZSM-5 catalyst. The hydrocarbon distribution mainly concentrated from C8 to C10. High content of nitrogen in bio-syngas was found to have effect on the liquid hydrocarbon distribution over Mo/HZSM-5 catalyst. Fresh and used Mo/HZSM-5 catalysts were characterized by BET, TGA, XRD, SEM-EDX and TEM technique. It was found that was molybdenum species was well distributed on the surface of HZSM-5. However, dealumination, agglomeration and coke deposition were observed in the used catalysts with the top layer suffered the most coke deposition.