Abstract
A rod-like-CeO2-supported Pd catalyst (Pd/CeO2-r) was prepared using two-step hydrothermal impregnation and used in the oxidative carbonylation of glycerol to produce glycerol carbonate. The characterization results showed that the Pd was highly dispersed on the surface of the CeO2-r, and metallic Pd was the main species in the catalyst. The Pd/CeO2-r exhibited good catalytic performance for the oxidative carbonylation of glycerol. Under optimized reaction conditions, the glycerol conversion and glycerol carbonate selectivity were 93% and 98%, respectively, and turnover frequency was 1240 h−1. However, because of the leaching of Pd and the growth of Pd particles, the catalyst was gradually deactivated throughout reuse.
Highlights
In recent years, concerns about global warming have resulted in increased interest in the biodiesel industry as a source of renewable energy.[1]
Peaks corresponding to Pd metal or Pd compounds were not observed in the X-ray diffraction (XRD) patterns of the Pd/ CeO2 with a rod-like structure (CeO2-r), which may be because a small amount of Pd species was highly dispersed on the CeO2.26,27
The CeO2-r and Pd/CeO2-r were characterized using Scanning electron microscope (SEM) and Transmission electron microscope (TEM), and the images are shown in Fig. 2 and 3, respectively
Summary
Concerns about global warming have resulted in increased interest in the biodiesel industry as a source of renewable energy.[1]. Casiello et al studied the homogeneous OCG reaction using CuCl2 as a catalyst and pyridine as a co-catalyst.[16] Excellent conversions (>92%) and selectivities (>93%) were obtained, and it was found that Cu+ is the intermediate species in the catalytic cycle. Hu et al.[18] developed a zeolite-Y-con ned Pd catalyst (PdCl2(phen)@Y) for the OCG reaction This heterogeneous catalyst exhibited a high activity, with a reasonable GL conversion of 95%, GLC selectivity of 98%, and a TOF of 317 hÀ1. Yuan[23] and Fu et al.[24] studied the oxidative carbonylation of phenol to produce DPC over a Pd catalyst supported on CeO2 nanotubes. We discuss the stability and catalytic mechanism of the Pd/CeO2-r catalyst
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