催化学报 ›› 2015, Vol. 36 ›› Issue (7): 1142-1154.DOI: 10.1016/S1872-2067(14)60312-0

• 论文 • 上一篇    

Pd-O/CeO2纳米管催化苯酚氧化羰基化反应

袁烨, 王志苗, 安华良, 薛伟, 王延吉   

  1. 河北工业大学化工学院, 河北省绿色化工与高效节能重点实验室, 天津300130
  • 收稿日期:2014-12-22 修回日期:2015-02-07 出版日期:2015-06-12 发布日期:2015-07-30
  • 通讯作者: 薛伟, 电话: (022)60202419; 传真: (022)60204697; 电子信箱: weixue@hebut.edu.cn;王延吉, 电话: (022)60202419; 传真: (022)60204697; 电子信箱: yjwang@hebut.edu.cn
  • 基金资助:

    国家自然科学基金(21236001, 21176056, 21106031); 河北省高校百名优秀创新人才支持计划(II)(BR2-208); 河北省自然科学基金(B2015202228).

Oxidative carbonylation of phenol with a Pd-O/CeO2-nanotubecatalyst

Ye Yuan, Zhimiao Wang, Hualiang An, Wei Xue, Yanji Wang   

  1. Hebei Provincial Key Laboratory of Green Chemistry & High Efficient Energy Saving, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China
  • Received:2014-12-22 Revised:2015-02-07 Online:2015-06-12 Published:2015-07-30
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21236001, 21176056, 21106031), the Programme for 100 Excellent Talents in University of Hebei Province (II) (BR2-208), and the Natural Science Foundation of Hebei Province (B2015202228).

摘要:

以碳纳米管(CNTs)为模板, 采用液相沉积-水热法制备了管状纳米氧化铈(CeO2-NT). 利用X射线衍射、透射电镜和N2等温吸附-脱附技术对其结构进行了表征, 所得CeO2-NT外径~25 nm, 长度大于300 nm, 管壁由粒径4-9 nm的CeO2晶粒组成, 比表面积为108.8 m2/g. 以其为载体制备了Pd-O/CeO2-NT催化剂, 程序升温还原结果发现, 该催化剂表面氧在低温下即可被还原, 具有较高的活性. 将Pd-O/CeO2-NT用于催化苯酚氧化羰基化反应, 催化剂活性和碳酸二苯酯(DPC)选择性均高于零维CeO2负载的Pd-O/CeO2-P催化剂. 在优化的条件下, 苯酚转化率为67.7%, DPC选择性为93.3%. 但该催化剂再次使用时活性下降明显, 这是由于Pd-O/CeO2-NT的管状结构在反应过程中被破坏, 并且活性组分Pd流失所致.

关键词: 碳酸二苯酯, 氧化羰基化, 氧化铈纳米管, 钯催化剂, 程序升温还原, 表面氧

Abstract:

CeO2 nanotubes (CeO2-NT) were synthesized using carbon nanotubes as template by a liquid phase deposition and hydrothermal method. X-ray diffraction, transmission electron microscopy, and N2 adsorption-desorption were used to characterize the CeO2-NT. The wall of CeO2-NT was composed of small interconnected nanocrystallites ranging from 4 to 9 nm in size. The specific surface area of CeO2-NT was 108.8 m2/g with an outer diameter of 25 nm and length > 300 nm. Supported Pd catalyst, Pd-O/CeO2-NT, was prepared using CeO2-NT as the support. Temperature-programmed reduction analysis showed that the surface oxygen on Pd-O/CeO2-NT could be reduced at low temperature, therefore it showed high activity in the reaction. Pd-O/CeO2-NT was used as the catalyst for the oxidative carbonylation of phenol. It has better activity and DPC selectivity than Pd-O/CeO2-P, which was prepared by supporting Pd on zero dimensional CeO2 particles. Under the optimized conditions, phenol conversion was 67.7% with 93.3% DPC selectivity with Pd-O/CeO2-NT. However, its catalytic activity decreased when the catalyst was used for the second time. This was attributed to the destruction of the tubular structure of Pd-O/CeO2-NT and Pd leaching during the reaction.

Key words: Diphenyl carbonate, Oxidative carbonylation, Ceria nanotube, Palladium catalyst, Temperature-programmed reduction, Surface oxygen