催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (5): 484-488.

• 研究论文 • 上一篇    

超声法制备掺钡纳米氧化镁及其负载钌基氨合成催化剂的催化性能

霍超,晏刚,郑遗凡,于凤文,刘化章   

  1. 浙江工业大学化学工程与材料学院, 浙江杭州 310032
  • 收稿日期:2007-05-25 出版日期:2007-05-25 发布日期:2011-04-28

Catalytic Performance of Ru Catalyst Supported on Ba-Doped Nano-Magnesia Prepared by Ultrasonic Method for Ammonia Synthesis

HUO Chao*, YAN Gang, ZHENG Yifan, YU Fengwen, LIU Huazhang   

  1. College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, Zhejiang, China
  • Received:2007-05-25 Online:2007-05-25 Published:2011-04-28

PDF

879

被引次数

45

摘要： 采用超声技术制备掺钡纳米氧化镁,并以其为载体,以Ru3(CO)12为前驱体,采用浸渍法制备了一系列钌基氨合成催化剂. 采用场发射扫描电镜、X射线衍射和N2物理吸附等表征手段,考察了催化剂的表面形貌、物相和表面织构性质. 在400～450 ℃的条件下评价了催化剂对氨合成的催化活性. 结果表明,以超声技术制备的掺钡纳米氧化镁有较大的比表面积和较规则的孔道结构,并增强了钡、镁之间的相互作用,使钡更均匀地分散于载体中,极大地提高了钡的促进作用,从而使其负载的钌基催化剂的活性大幅度提高. 当超声作用为时间30 min时,在10 MPa, 425 ℃和空速10000h-1的条件下, 4%Ru/Ba-MgO催化剂上的氨合成反应速率达到61.02 mmol/(g•h).

关键词: 超声制备, 钡, 纳米氧化镁, 钌, 负载型催化剂, 氨合成

Abstract: Ba-doped nano-magnesia (Ba-MgO) was prepared by the chemical co-precipitation method using ultrasonic technique, and a Ru catalyst was prepared using this Ba-doped nano-magnesia as the support andRu3(CO)12as the Ru precursor by impregnation. The catalyst was characterized by field-emission scanning electron microscopy,X-raydiffraction, and N2 physical adsorption.The Ba-doped nano-magnesia treated with ultrasonic wave has large surface area and regular porosity, and Ba was uniformly dispersed in the support. The activity of the Ru catalyst for ammonia synthesis was evaluated under the conditions of10000h-1, 10.0 MPa, and400-450℃. With the promotion of Ba, the Ru catalyst supported on Ba-MgO showed high activity. When the nano-magnesia was treated with ultrasonic wave for 30 min, the reaction rate of ammonia synthesis over4%Ru/Ba-MgOreached 61.02 mmol/(g•h) under the conditions of 10.0 MPa, 425 ℃, and10000h-1.

Key words: ultrasonic preparation, barium, nano-magnesia, ruthenium, supported catalyst, ammonia synthesis