Mo2C/MoO2-ZrO2催化剂上正己烷异构化

以十六烷基三甲基溴化铵（CTAB）和聚乙二醇20 000（PEG20 000）为模板剂，采用共沉淀法制备前躯体MoO3/ZrO2，然后使用程序升温法，以正己烷为碳源，制备了Mo2C/MoO2-ZrO2催化剂。XRD和BET分析结果显示，催化剂具有明显的β-Mo2C特征峰和适宜的孔径孔体积。以正己烷为原料，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，考察了该催化剂的异构化性能。结果表明，Mo2C/MoO2-ZrO2上的正己烷异构化优化反应反应温度380 ℃、反应压力2.5 MPa、体积空速1.0 h-1、氢烃体积比400:1，在此条件下的正己烷转化率达到67.5%，异构化选择性和异构化收率分别为82.5%和55.7%。

STUDY ON THE HYDROISOMERIZATION OF n-HEXANE OVER Mo2 C/MoO2-ZrO2 CATALYST

Using a mixture of cetyltrimethylammonium bromide (CTAB) and polyethylene glycol 20 000 (PEG 20 000) as template, MoO3/ZrO2 precursor was prepared by co-precipitation process. Using n-hexane as carbon source, Mo2C/MoO2-ZrO2 catalyst was prepared by temperature programming reduction. The XRD and BET results showed that β-Mo2C was existed and the catalyst had applicable pore diameter and pore volume. Tests for hydroisomerization of n-hexane over Mo2C/MoO2-ZrO2 catalyst were carried out in a fixed-bed down-flow reactor system to study the effect of reaction parameters, such as temperature, pressure, LHSV and volume ratio of hydrogen to hydrocarbon (H2/CH) on the catalytic behavior of said catalyst. Under the optimum conditions of a reaction temperature of 380℃, a reaction pressure of 2.5 MPa, a LHSV of 1.0 h-1 and H2/CH volume ratio of 400, the conversion of n-hexane reached 67.5%, the selectivity to isomers and isomers yield were 82.5% and 55.7%, respectively.