催化学报 ›› 2015, Vol. 36 ›› Issue (7): 994-1000.DOI: 10.1016/S1872-2067(15)60850-6

• 论文 • 上一篇    下一篇

Ni对Pd/Al2O3密偶催化剂催化性能的影响

方瑞梅a,c, 崔亚娟b,c, 史忠华c, 龚茂初c, 陈耀强a,c   

  1. a 四川大学化学工程学院, 四川成都610064;
    b 四川大学环境与工程学院, 四川成都610064;
    c 四川大学化学学院, 绿色化学与技术教育部重点实验室, 四川成都610064
  • 收稿日期:2015-02-05 修回日期:2015-03-26 出版日期:2015-06-12 发布日期:2015-07-30
  • 通讯作者: 史忠华, 电话/传真: (028)85418451; 电子信箱: shizh96@scu.edu.cn;陈耀强, 电话/传真: (028)85418451; 电子信箱: nic7501@scu.edu.cn
  • 基金资助:

    国家自然科学基金(21173153); 四川省科技厅科技支撑项目(2014SZ0143).

Promotion of a Pd/Al2O3 close-coupled catalyst by Ni

Ruimei Fanga,c, Yajuan Cuib,c, Zhonghua Shic, Maochu Gongc, Yaoqiang Chena,c   

  1. a College of Chemical Engineering, Sichuan University, Chengdu 610064, Sichuan, China;
    b College of Architecture & Environment, Sichuan University, Chengdu 610064, Sichuan, China;
    c Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
  • Received:2015-02-05 Revised:2015-03-26 Online:2015-06-12 Published:2015-07-30
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21173153) and the Sichuan Province Science and Technology Support Program (2014SZ0143).

摘要:

考察了助剂Ni对以改性氧化铝为载体的单Pd密偶催化剂的影响. 结果表明, 掺杂Ni可以明显改善对C3H8的催化性能, 尤其对老化催化剂效果显著. 此外, Ni的添加使老化催化剂Pd/Al2O3的起燃温度(T50)和完全转化温度(T90)分别降低31和30 ℃. 单反应测试结果表明, 添加Ni能明显提高对C3H8 + NO反应的催化性能. 采用H2程序升温还原、CO吸附、高倍透射电镜和X射线光电子能谱等手段对新鲜和老化催化剂进行了表征. 结果表明, 掺杂Ni不仅可以抑制活性组分PdOx的烧结, 减少金属态Pd0的产生, 而且可以提高PdOx物种的可还原能力和有效比表面积.

关键词: 密偶催化剂, 钯, 镍, 氧化铝, 丙烷

Abstract:

The influence of a nickel promoter on the catalytic behavior of a modified alumina supported Pd close-coupled catalyst was investigated. Doping with nickel improved the catalytic activity for the reactions of C3H8, especially over the aged catalyst. T50 and T90 of the aged Pd catalyst were decreased by 31 and 30 ℃, respectively. The single reaction results revealed that doping with Ni promoted the catalytic activity for the C3H8 + NO reaction. The fresh and aged catalysts were characterized by H2-temperature-programmed reduction, CO chemisorption, high resolution transmission electron microscopy, and X-ray photoelectron spectroscopy, which revealed that the doping with Ni inhibited the sintering of active PdOx species and the formation of undesired metallic Pd0, and led to improved reducibility of active PdOx and increased the surface area of PdOx species.

Key words: Close-coupled catalyst, Palladium, Nickel, Alumina, Propane