MgO海/泡石复合载体负载Cu催化剂催化环己醇脱氢

采用浸渍沉淀法制备了不同比例的MgO/海泡石(Sep)复合载体负载Cu催化剂,并考察了其对环己醇脱氢反应的催化性能。采用N2气物理吸附、X射线衍射(XRD)、红外光谱(IR)、氨气程序升温脱附(NH3-TPD)、程序升温还原(TPR)等测试技术对催化剂进行了表征。结果表明,海泡石的引入有助于催化剂比表面积的增加,但当载体中海泡石的比例太高时,会导致催化剂酸性以及活性组分Cu状态的变化,从而降低催化剂的活性和选择性。当复合载体中海泡石质量分数为40%时,催化剂的活性最高,选择性也较好。

Cu Catalyst Supported on MgO/Sepiolite Composite Carrier for Dehydrogenation of Cyclohexanol

A series of Cu catalysts supported on MgO/Sepiolite composite carriers were prepared by precipitation method combined with impregnation method and used for dehydrogenation of cyclohexanol.The catalysts were characterized by means of N2 adsorption,X-ray diffraction(XRD),Infrared spectroscopy(IR),NH3 temperature programmed desorption(NH3-TPD),and temperature programmed reduction(TPR),respec-tively.The results show that the addition of sepiolite facilitated the increase of the specific surface area of the catalysts,but when the fraction of the sepiolite in the carrier was too high,the acidity of the catalyst and the form of the Cu species would be influenced,which lead to decrease of the activity and selectivity of the catalysts.When the mass ratio of Sepiolite in the composite carrier was up to 40%,the catalyst exhibit an excellent catalytic activity and selectivity.