嵌埋式纳米钌基催化剂的制备及其催化水煤气变换反应的性能  

Preparation of Nano-Ru-Embedded Catalyst and Its Catalytic Performance for Water-Gas Shift Reaction

作　　者：郭晓勇[1] 华南平[1] 杜玉扣[1] 杨平[1] 

机构地区：[1]苏州大学化学化工学院,江苏苏州215123

出　　处：《催化学报》2007年第2期137-142,共6页

基　　金：国家自然科学基金(20543001);江苏省自然科学基金(BK2003031);江苏省教育厅自然科学基金(03kJB150115).

摘　　要：采用溶胶法制备了平均粒径为4.9nm的RuO2溶胶,然后以镁铝尖晶石为载体,用一步沉淀法制备了嵌埋式纳米Ru基水煤气变换反应催化剂.利用透射电子显微镜、扫描电子显微镜和粉末X射线衍射等技术对样品进行了表征.结果表明,Ru纳米粒子均匀分散在载体内部,催化反应活性中心通过载体上形成的细微孔道与反应物接触.向催化剂中添加适量的K2O和La2O3助剂可以有效地提高其催化活性.RuO2 nanoparticles with an average diameter of 4.9 nm were prepared using the sol-gel method. Rubased embedded catalysts were prepared by one-step deposition using MgAl2O4 spinel as the support. The nanoparticles and the catalysts were characterized by transmission electron microscopy, scanning electron microscopy, and X-ray diffraction. The results showed that the Ru nanoparticles were evenly distributed in the MgAl2O4 spinel support. The as-prepared embedded catalyst showed high activity for the water-gas shift reaction, and the Ru nanoparticles contacted with reactant molecules through the pores formed during the calcination of the catalyst. The addition of an appropriate amount of K2O and La2O3 promoters effectively improved the catalyst activity.

关 键 词：钌 纳米粒子 氧化镧 氧化钾 嵌埋式催化剂 水煤气变换反应 

分 类 号：O643.36[理学—物理化学]