Effects of promoters over mesoporous PdCl2--CuCl2-/HMS catalysts for oxidative carbonylation of ethanol to diethyl carbonate

FUEL 64

Pingbo Zhang, Yang Yang, Shuang Chen, Shouying Huang, Shengping Wang, and Xinbin Ma, xbma@tju.edu.cn. Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Diethyl carbonate (DEC) has been produced by the oxidative carbonylation of ethanol in the gas phase over a heterogeneous PdCl2-CuCl2 catalyst supported on hexagonal mesoporous silica (HMS). The various quaternary ammonium salt (QAS) promoters have a great effect on the performance of the catalyst, which was due to the high dispersal of the active species on the film composed of nonpolar groups. The catalytic performance of the PdCl2-CuCl2/HMS catalyst was greatly improved by the addition of promoter tetraethyl ammonium bromide (TEAB). Under the PdCl2- CuCl2-TEAB/HMS catalyst system, space time yield (STY) of DEC was 210.9 g/(L•h), and conversion of EtOH was 13.6%. From X-ray powder diffraction (XRD) and infrared resonance (IR) spectroscopy, it could be concluded that the essential role of TEAB promoter was to improve the order degree of mesoporous structure, which enhanced catalytic performance in the gas phase DEC synthesis.
 

Green Chemistry for Sustainable Energy Supply and Conversion
8:15 AM-12:15 PM, Monday, April 7, 2008 Morial Convention Center -- Rm. 242, Oral

Division of Fuel Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008