β-Mo_2C/SAPO-11催化剂上正十二烷临氢异构化研究

STUDY ON THE HYDROISOMERIZATION OF n-DODECANE OVER β-Mo_2C/SAPO-11 CATALYST

采用浸渍法和程序升温法,以正己烷为碳源,制备了β-Mo2C(20%,质量分数)/SAPO-11催化剂。XRD,BET,FTIR分析结果显示,β-Mo2C结晶良好,具有合适的孔体积和孔径。以正十二烷为原料,在连续流动的固定床反应装置上,通过改变温度、压力、体积空速以及氢烃体积比等参数,考察该催化剂的异构化反应性能。结果表明,β-Mo2C(20%)/SAPO-11上的正十二烷异构化优化反应条件为:反应温度400℃,反应压力3.0MPa,体积空速1.0h-1,氢烃体积比400。在此条件下的正十二烷转化率达到80.2%,异构化选择性和异构体收率分别为70%和57%左右。

β-Mo2C（20%）/SAPO-11 catalyst was prepared by impregnation and temperature programming reduction using n-hexane as carbon source. The test results of XRD, BET and FT-IR showed that β-Mo2C was well crystallized and the catalyst possessed preferable pore diameter and pore volume. The hydroisomerization performance of n-dodecane over β-Mo2C/SAPO-11 catalyst was studied using a fixed-bed down-flow reactor system, and the effect of reaction parameters, such as temperature, pressure, LHSV and the H2/oil volume ratio was investigated. Results showed that under the optimum conditions of a reaction temperature of 400℃, a reaction pressure of 3MPa, a LHSV of 1.0 h-1, and a H2/oil volume ratio of 400, the conversion of n-dodecane reached 80.2%, the isomers selectivity and the isomers yield were about 70% and 57%, respectively.