重质费-托合成油在不同分子筛催化剂上的裂化反应性能研究

采用小型固定流化床实验装置，考察了活性组分分别为USY，Beta，ZRP分子筛的3种催化剂对重质费-托合成油裂化反应性能的影响，重点研究了不同分子筛催化剂对汽油产率及性质的影响。结果表明：USY催化剂作用下的汽油产率最高，汽油中异构烷烃质量分数高达39.87%；Beta和ZRP催化剂作用下的液化气产率分别高达52.44%和50.92%，且液化气中丙烯的浓度高。不同分子筛催化剂对重质费-托合成油催化裂化性能的差别在于其反应机理不同，重质费-托合成油在ZRP催化剂中主要发生单分子反应，而在USY催化剂中双分子反应很活跃；Beta催化剂中主要发生单分子反应，其双分子反应活性高于ZRP分子筛，但低于USY分子筛。

CRACKING PERFORMANCE OF HEAVY FISCHER-TROPSCH SYNTHESIS OIL ON ZEOLITE CATALYSTS

USY zeolite, Beta zeolite and ZRP zeolite were used for testing the cracking performance of heavy Fischer-Tropsch synthesis oil in a bench-scale fixed-fluidized bed reactor, respectively, emphasizing on the yield and properties of the naphtha product. The results indicate that the highest yield of catalytic naphtha is obtained using the USY zeolite catalyst, the content of iso-paraffins in the catalytic naphtha is as high as 39.87%; the LPG yield of 52.44% and 50.92% are reached over Beta and ZRP zeolite catalysts, respectively with high concentration of propylene. The differences of reaction performance of heavy Fischer-Trosph synthesis oil on the three different zeolite catalysts can be attributed to their different reaction paths. The monomolecular reactions are taken place in a dominant position in the small pores of ZRP zeolite, while in the larger pores of USY zeolite a bimolecular reaction mechanism is operative. In the pores of Beta zeolite, the monomolecular reactions are mainly taken place and the bimolecular reactions can be also occurred in a certain extent, but more than that of ZRP zeolite and less than that of USY zeolite.