物理化学学报 >> 2013, Vol. 29 >> Issue (10): 2255-2262.doi: 10.3866/PKU.WHXB201308271

催化和表面科学 上一篇    下一篇

Zr0.5Ti0.5O2的添加对超临界裂解RP-3催化剂性能的影响

焦毅1, 秦莉晓2, 李雄健2, 王佳2, 王健礼1, 朱权2, 李象远2, 陈耀强1   

  1. 1 四川大学化学学院, 绿色化学与技术教育部重点实验室, 成都 610064;
    2 四川大学化工学院, 成都 610064
  • 收稿日期:2013-06-18 修回日期:2013-08-26 发布日期:2013-09-26
  • 通讯作者: 王健礼 E-mail:wangjianli@scu.edu.cn
  • 基金资助:

    国家自然科学基金(91016002);四川大学优秀青年学者科研基金(2013SCU04A05);国家高技术研究发展计划项目(863)(2006AA01A119)和高超声速冲压发动机技术重点实验室开放基金(20120103013)资助

Influence of Adding Zr0.5Ti0.5O2 on the Performance of Supercritical Cracking Catalyst for RP-3

JIAO Yi1, QIN Li-Xiao2, LI Xiong-Jian2, WANG Jia2, WANG Jian-Li1, ZHU Quan2, LI Xiang-Yuan2, CHEN Yao-Qiang1   

  1. 1 Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China;
    2 College of Chemical Engineering, Sichuan University, Chengdu 610064, P. R. China
  • Received:2013-06-18 Revised:2013-08-26 Published:2013-09-26
  • Contact: WANG Jian-Li E-mail:wangjianli@scu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (91016002), Outstanding Young Scholar Fund of Sichuan University, China (2013SCU04A05), National High-Tech Research and Development Program of China (863) (2006AA01A119), and Open Foundation of Key Laboratory on Hypersonic Scramjet Technology, China (20120103013).

摘要:

采用共沉淀法制备了Zr0.5Ti0.5O2载体材料,将其掺杂在CeO2-Al2O3 (CA)基催化剂中, 并对其催化活性进行了超临界裂解测试, 采用全自动吸附仪、X射线衍射(XRD)、透射电镜(TEM)、程序升温脱附(TPD)等方法对催化剂进行了表征. 实验结果表明, 催化剂能够明显降低裂解反应的温度, 600 ℃ CA基催化剂产气率是热裂解的2.8倍, 掺杂Zr0.5Ti0.5O2载体材料的CA基催化剂是热裂解的4.0倍, 650 ℃时, 掺杂Zr0.5Ti0.5O2载体材料的CA基催化剂热沉提高了0.55 MJ·kg-1. BET结果表明, 掺杂Zr0.5Ti0.5O2载体后催化剂出现双孔结构, 部分小孔的出现使得乙烯的选择性提高; NH3-TPD结果表明, 掺杂Zr0.5Ti0.5O2载体材料后, 催化剂强酸位的酸量增加了4.0倍,催化剂表现出更强的表面酸性和更集中的强酸酸中心密度, 有利于裂解多产烯烃.

关键词: 吸热燃料, 钛锆复合氧化物, 超临界, 催化裂解, 热沉

Abstract:

Zr0.5Ti0.5O2 was prepared by co-precipitation and tested for its catalytic performance under supercritical conditions when mixed with a CeO2-Al2O3 (CA) base catalyst. The catalysts were characterized with an automatic adsorption instrument (BET method), X-ray diffraction (XRD), transmission electron microscopy (TEM), and temperature programmed desorption (TPD). It was found that Zr0.5Ti0.5O2 significantly lowered the temperature of the cracking reaction, and increased the thermal cracking gas rate by a factor of 2.8 times as large as that at 600 ℃ for the CAbase catalyst. The gas rate was increased by a factor of 4.0 times when it was doped into the CAbase catalyst, and the heat sink increased by 0.55 MJ·kg-1 over that of thermal cracking at 650 ℃. BET results show that the Zr0.5Ti0.5O2-doped CAbase catalyst has a double-pore structure that enhances ethylene selectivity. NH3-TPD result indicates that the acidity of the catalyst increased by 4.0 times, indicating improved surface acidity conducive to alkene generation.

Key words: Endothermic fuel, ZrO2-TiO2 composite oxide, Supercritical, Catalytic cracking, Heat sink

MSC2000: 

  • O643.36