Performance of Catalyst Ni-NiO/γ-Al_2O_3 in the Catalytic Reaction from Tetrahydrofurfuryl to Pyridine

The catalyst Ni-NiO/γ-Al2O3 was prepared by kneading extruding method,and was characterized by means of SEM,XRD,BET and some other methods.It was then applied in the catalytic reaction from tetrahydrofurfuryl and ammonia to pyridine in a fixed-bed reactor.The influence of such factors as catalyst content,temperature,molar ratio of ammonia to THFA on the catalytic reaction was investigated.The experimental results are as follows.With the increase of Ni-NiO content in the catalyst,the yield of pyridine increases,while that of piperidine decreases.The yield of isoquinoline is of a higher value at the Ni-NiO content of 20%.Within a certain temperature range between 350～550 ℃,with the temperature increasing,the yield of pyridine increases,while that of piperidine decreases.The yield of isoquinoline is the highest at the temperature of 400 ℃.When the molar ratio of ammonia to THFA was 3∶1,the yield of pyridine and that of isoquinoline are both relatively higher.When that ratio was 2∶1,the yield of piperidine is relatively higher.