Ni-NiO/γ-Al_2O_3催化四氢糠醇制备吡啶

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

采用捏合挤条法制备了催化剂Ni-NiO/γ-Al2O3,用SEM、XRD、BET等方法对催化剂进行了表征,并将催化剂应用于四氢糠醇(THFA)与氨气在固定床反应器中制备吡啶。考察了Ni-NiO负载量、温度、氨醇摩尔比等因素对催化反应的影响,结果表明,随着催化剂组分Ni-NiO负载量的升高,吡啶的收率随之升高,而哌啶的收率随之降低,异喹啉收率在Ni-NiO质量分数为20%时达最高;在350～550℃,随着温度的升高,吡啶的收率随之升高,而副产物哌啶的收率随之降低,异喹啉在400℃收率较高;当氨醇摩尔比为3∶1时,吡啶与异喹啉的收率较高,2∶1时哌啶收率较高。

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.