Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (7): 1142-1154.DOI: 10.1016/S1872-2067(14)60312-0

• Articles • Previous Articles    

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).

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