Oxidative carbonylation of phenol to diphenyl carbonate by Pd/MO-MnFe2O4 magnetic catalyst

摘要

In order to screen one suitable catalyst for magnetically stabilized fluidized bed (MSFB) reactor in the process of oxidative carbonylation of phenol to diphenyl carbonate (DPC), Pd/MnFe2O4 catalysts were chosen, then prepared and characterized by XRD, H-2-TPR, O-2-TPD and VSM. Compared to the other metal ion doped spinel ferrite catalysts, the catalytic activity of Pd/10% PbO-MnFe2O4 was much higher, which the single pass yield of DPC reached 33.12% with selectivity above 99%, and TOF (turnover frequency) reached 70.56 molDPC.(molPd h)(-1). The result showed that the formation of the ferrite oxygen-deficient and ion transference in the ferrites was in favor of the catalytic activity. When the support MnFe2O4 was calcinated at 500 degrees C, the saturation magnetization of the obtained catalyst Pd/10% PbO-MnFe2O4 came up to 37.81 Am-2 kg(-1). With good magnetic property and brilliant catalytic activity the catalyst Pd/PbO-MnFe2O4 may suite for industrial experiments in MSFB reactor in future. (C) 2014 Elsevier B.V. All rights reserved.