Mo_2C/γ-Al_2O_3催化剂上苯加氢反应的原位红外光谱研究  

Hydrogenation Study of Benzene over a Mo_2C/γ-Al_2O_3 Catalyst by In situ IR Spectroscopy

作　　者：杨帆[1] 张静[2] 吴维成[2] 

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001 [2]辽宁石油化工大学化学与材料科学学院,辽宁抚顺113001

出　　处：《物理化学学报》2014年第5期943-949,共7页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20903054)资助项目~~

摘　　要：采用程序升温反应法制备了钝化态、还原钝化态和新鲜态Mo2C/γ-Al2O3催化剂,结合原位红外光谱表征技术和反应性能评价,考察、比较了三种催化剂苯加氢反应活性.原位红外光谱结果表明,新鲜态Mo2C/γ-Al2O3催化剂在室温就显示了较好的苯加氢反应活性,表现了类贵金属的催化活性.CO吸附在反应前后新鲜态Mo2C/γ-Al2O3催化剂上的对比结果表明,低价态的Mo位(Moδ+(0<δ<2))是苯加氢反应活性中心.三种催化剂的反应活性结果表明,新鲜态Mo2C/γ-Al2O3催化剂反应活性最好,催化剂寿命最长,失活之后在500°C下H2处理即可恢复原有活性.Passivated, reduced passivated, and fresh Mo2C/γ-Al2O3 catalysts were prepared by temperature- programmed reactions with a CH4/H2 gas mixture. The results of in situ infrared （IR） analysis revealed that the fresh Mo2C/γ-Al2O3 catalyst displayed the highest level of activity at room temperature, with cyclohexane being detected as the only product. The activity of molybdenum carbide in this reaction was comparable to that of the noble metals. The results from the in situ IR spectra for CO adsorbed onto the fresh Mo2C/γ-Al2O3 catalyst before and after the hydrogenation of benzene showed that Mo2C was active for the hydrotreating processes and Mo8＋ （0〈δ〈2） was the active center for the hydrogenation of benzene. The activities of the three different catalysts for the hydrogenation of benzene were studied, and the results revealed that fresh Mo2C/γ-Al2O3 was the most active catalyst.

关 键 词：原位红外光谱 苯加氢 Mo2C Γ-AL2O3 CO吸附 活性中心 

分 类 号：O643.32[理学—物理化学]