Study On Catalysts And Process Of Synthesis For Pyridine From THFA

Pyridine was synthesized from tetrahydrofurfuryl alcohol（THFA） andNH3． Single component catalyst such as Al₂O₃-supported Co₃O₄, Cr₂O₃and MoO₃were prepared. The component MoO₃with the best result was selected as the maincatalyst to formulated variouse multiple or composite catalysts. The catalystCr₂O₃-MoO₃/Al₂O₃was identified as the best one by condition investigation ofcatalytic performance. The catalyst structure was characterized. The process and itsstability for the synthesizing pyridine by this catalyst was investigated in fixed-bedreactor．The apropriate condition was determined as the following: The reactiontemperature was at500℃. The molar ratio of NH3to THFA was3:1. The flow rateof THFA was0.15mL/min.The reaction was carried out under atmospheric pressure.The conversion of THFA was100%.The yield of pyridine was85.30%．The catalytic process of tetrahydrofurfuryl alcohol（THFA） and ammonia byfixed-bed reactor to give pyridine was studied. Various Ni-NiO content ofNi-NiO/γ-Al₂O₃catalysts were prepared. The catalyst was characterized. Thecatalytic effect of the reaction between tetrahydrofurfuryl alcohol and ammonia toobtain pyridine and other main byproducts was estimated. The influences oftemperature, molar ratio of ammonia to THFA， and LHSV on the catalytic reactionwere investigated. The catalytic results of Ni-NiO/γ-Al₂O₃catalyst were given as thefollowings. With the increase of Ni-NiO content in catalyst, the yield of pyridine andisoquinoine in products increases. The yield of piperidine decreases; In certaintemperature range between350℃⁵50℃, with the temperature increasing, the yieldof pyridine in products increases. The yield of piperidine decreases. The yield ofisoquinoline has higher value at the temperature of400℃.