环己烷在碳化钼催化剂上的脱氢研究

以环己烷为碳源，采用程序升温还原法制备碳化钼催化剂，对前驱物和中间物及催化剂的晶相结构进行XRD表征，在固定床反应装置上进行环己烷的脱氢反应实验。固定反应压力为0.1 MPa，考察反应温度、空速、氢烃体积比和压力对碳化钼脱氢活性的影响。结果表明，催化剂活性相为高活性的β-Mo₂C，在反应温度450 ℃、空速2 h^-1、压力0.1 MPa和氢烃体积比200∶1条件下，环己烷转化率达88%，脱氢反应的选择性为79%。

Study on cyclohexane dehydrogenation over molybdenum carbide catalyst

Molybdenum carbide catalyst was prepared by the method of temperature programming reduction using n-hexane as the carbon source. The crystalline structures of precursor, intermediate and molybdenum carbide catalyst were characterized by XRD. The dehydrogenation of cyclohexane was carried out in a fixed bed reactor. The effects of reaction temperature, space velocity and volume ratio of hydrogen to cyclohexane on cyclohexane dehydrogenation were investigated under the pressure 0.1 MPa. The results showed that the active phase of molybdenum carbide catalyst was β-MozC,and cyelohexane conversion of 88% and the selectivity to benzene of 79% were attained under the optimum condition as follows：reaction temperature 450 ℃, reaction pressure 0.1 MPa, liquid hourly space velocity 2 h - 1 and volume ratio of hydrogen to cyclohexane 200： 1.