B. Han, Wenbo Zhao, Xianye Qin
Mar 5, 2013
Citations
0
Influential Citations
17
Citations
Journal
Catalysis Communications
Abstract
Abstract A series of metal oxides and lead compounds were employed as catalysts for the methoxycarbonylation of 1,6-hexamethylenediamine (HDA) with methyl carbamate (MC) to produce dimethyl hexane-1,6-diyldicarbamate (HDC). Lead-containing compounds showed excellent catalytic behavior, 100% conversion of HDA and 93% yield of HDC could be achieved with lead dioxide (PbO2) as catalyst at 463 K for 6 h in the first cycle, then it goes down to 72%. The X-ray diffraction (XRD) and Infrared spectrum (IR) characterization results indicated that PbO2 catalyst has been converted into lead carbonate (PbCO3) through intermediate dilead oxide carbonate (Pb2OCO3) in the reaction process. This conversion may be the reason for the reduction of PbO2 catalytic activity.