关键词: 碳化钼, MoO3/ZrO2, 正己烷, 异构化

Abstract: 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.

Key words: molybdenum carbide, MoO3/ZrO2, hexane, isomerization