中文摘要：

在生物柴油生产过程中大量副产的甘油是重要的生物质转化平台化合物.通过甘油氢解制备高附加值的1,3-丙二醇是甘油的资源化利用的重要途径,能够显著提高生物柴油产业的经济效益,同时也是探究更复杂的糖醇类化合物氢解的模型反应.因此,甘油氢解制备1,3-丙二醇成为当前学术界的研究热点.通常,以Re或W为助剂修饰的贵金属催化剂是有效的甘油选择性氢解制1,3-丙二醇的催化剂,其中,双金属Ir-Re催化剂是目前最高效的催化剂之一.甘油氢解反应是典型的结构敏感性反应,它的催化性能依赖于双金属催化剂的结构,而后者受制备工艺条件如热处理方式及条件的影响.最近,我们报道了以直接还原法（即浸渍-还原法）制备的Ir-Re催化剂为合金结构,在甘油氢解中表现出更为优越的反应活性及目前报道中最高的1,3-丙二醇生成速率,并提出了可能的双功能反应机理,即催化剂表面的Re-OH酸性位和Ir均为甘油氢解的活性位.本文采用直接还原法制备KIT-6（具有三维有序介孔孔道结构的Si O2）负载的双金属Ir-Re催化剂,进一步研究还原温度对Ir-Re/KIT-6的结构及其催化性能的影响,揭示催化剂表面酸性在甘油氢解反应中的重要作用并阐明其构-效关系.结果显示不同还原温度（400–700 ℃）制备的催化剂的比表面积、孔体积及孔径数据基本一致,表明还原温度对Ir-Re/KIT-6的织构性质的影响很小.根据程序升温还原和透射电镜-能量散射点扫描结果可知,不同温度还原后的催化剂表面Ir和Re均以金属态形式存在,同时两者存在直接的相互作用,形成了Ir-Re合金;而漫反射红外图谱上CO吸附峰的红移以及峰形的显著变化也印证了Ir-Re合金结构的形成.TEM结果显示,在400–700 ℃还原后得到的Ir-Re合金纳米粒子均匀分布于KIT-6上,尺寸基本一致（2.5–2.8 nm）,与CO化学吸附结果一致.此外,NH3-程序升

英文摘要：

A series of bimetallic Ir-Re/KIT-6 catalysts was prepared by direct activation of impregnated sam-ples at various reduction temperatures to study the effect of pretreatment temperature on catalyst structure and on catalytic performance for glycerol hydrogenolysis. All catalysts were characterized by N2 adsorption-desorption, transmission electron microscopy, CO chemisorption,in-situCO ad-sorption diffuse reflectance infrared Fourier transform spectroscopy and temperature-programmed desorption of ammonia （NH3-TPD）. The results demonstrated that those catalysts reduced at 400 to 700 ＆#176;C exhibited an Ir-Re alloy structure with similar particle sizes and Ir dispersions. Furthermore, NH3-TPD results indicated that all catalysts had similar acid strengths, though acid density varied with the reduction temperature. Increasing the pretreatment temperature from 400 to 600 ＆#176;C monotonically increased the acid density of the catalysts and also improved the catalytic activity for glycerol hydrogenolysis. Reducing the Ir-Re alloy catalyst at 700 ＆#176;C slightly decreased the activity due to the growth of the metal particles. Moreover, a linear relationship was identified between the acid density of a catalyst and its activity, verifying the vital roles of both Re and surface acidity with regard to optimizing the performance of Ir-Re alloy catalysts.