碳化钼催化剂的XPS研究  

An XPS Investigation of Mo 2C Catalysts

作　　者：丁正新[1,2] 盛世善 朱俊发[1,2] 朱晓雷 熊国兴[1,2] 庄叔贤 

机构地区：[1]中国科学技术大学化学物理系 [2]中国科学院大连化学物理研究所

出　　处：《Chinese Journal of Chemical Physics》1997年第3期237-240,共4页化学物理学报（英文）

基　　金：催化基础国家重点实验室资助

摘　　要：用程序升温碳化法在ＣＨ４／Ｈ２气流中，由前驱体ＭｏＯ２／Ｃ出发，制备了活性炭担载的高分散Ｍｏ２Ｃ／Ｃ催化剂，并用ＸＰＳ和ＸＲＤ等方法考察了制备温度、钼含量、钝化处理和氢还原活化对催化剂表面状态的影响，６８０℃碳化制得的具有高甲烷活性的Ｍｏ２Ｃ／Ｃ催化剂表面钼中，以Ｍｏ４＋组分为主。Ｃ１ｓ单峰位于２８４．５ｅＶ，未发现反映Ｃ－Ｍｏ键合的低结合能的Ｃ１ｓ峰。６００℃氢还原后，表面的Ｏ／Ｍｏ原子比仍在０．４～０．５之间。结合其他常规测试结果，对表面活性中心进行了初步的推测。The highly dispersed Mo 2C catalysts supported on charcoal were prepared by temperature-programmed carburization of precursor MoO 2/C in CH 4/H 2 mixtures.The effects of carburization temperature,Mo-loading,passivation and H 2-reduction on the surface properties were studied by XRD,XPS,CO uptake and specific surface area measurements.The Mo 2C/C catalysts prepared at 680℃ had a high activity in methanation.After H 2-reduction of these passivated catalysts at 600℃,an O/Mo atomic ratios of 0.4～0.5 and a preferential component of Mo 4+ were observed on surface.Only a single peak of C1s was detected at 284.5eV.The nature of active sites is discussed.

关 键 词：碳化钼 甲烷化 催化剂 XPS 

分 类 号：O643.36[理学—物理化学]