Cs/活性炭促进的Ru基合成氨催化剂中金属、助剂和载体间的相互作用  

Interaction among Metal, Promoter and Support over Cesium/Active Carbon-Promoted Ruthenium-Based Catalyst for Ammonia Synthesis

作　　者：吴山[1] 郑春明[1] 陈继新[1] 郑兴芳[1] 曾海生[1] 关乃佳[1] 

机构地区：[1]南开大学化学学院新催化材料科学研究所,南开大学天津大学联合研究院,天津300071

出　　处：《催化学报》2004年第11期873-877,共5页

基　　金：教育部留学回国人员资助项目 (外教司留 0 0 2 47);教育部南开大学;天津大学科技合作项目

摘　　要：以经过H2 处理的活性炭 (HTAC)为载体 ,RuCl3 ·nH2 O和CsNO3 为前驱物 ,采用浸渍法制备了Cs促进的Ru/HTAC合成氨催化剂 .通过常压下催化剂的活性评价 ,以及对催化剂进行的TGA ,XRD和XPS表征 ,研究了催化剂中金属、助剂和载体间的相互作用 .结果表明 ,金属Ru促进了助剂CsOH的生成 ,CsOH能抑制Ru颗粒的聚集变大 ;HTAC抑制了CsOH的挥发 ,CsOH可向HTAC提供电子 ,HTAC的表面至少需被CsOH单层饱和覆盖 ,才能获得最佳的催化活性 ;HTAC既能吸引Ru的电子 ,又能将所吸引的来自CsOH的更多的电子传递给Ru .Active carbon-supported cesium-promoted ruthenium-based catalyst for ammonia synthesis was prepared by the impregnation method using hydrogen-treated active carbon (HTAC) as support, and RuCl 3·nH 2O and CsNO 3 as precursors of metal and promoter, respectively. Through the catalyst activity evaluation at atmospheric pressure and characterization of the catalyst by TGA, XRD and XPS techniques, interaction among metal, promoter and support of the catalyst was investigated and some conclusions were obtained. Metallic Ru facilitates the decomposition of CsNO 3 into promoter CsOH, and CsOH inhibits metallic Ru from conglomeration. HTAC prevents CsOH from volatilization, CsOH donates electron to HTAC and appropriate catalyst with high activity and stability can be obtained when the surface of HTAC is saturated at least by single layer of CsOH at certain content of Ru. HTAC attracts electron of Ru, and meanwhile transfers more electron from CsOH to Ru.

关 键 词：钌 氢氧化铯 活性炭 相互作用 合成氨 

分 类 号：O643[理学—物理化学]