Preparation of Cr-MnOx/Cordierite and Their Properties for Catalytic Oxidation of 1,2-Dichlorobenzene
ZHANG Wen-rui1, TANG Ai-dong2, XUE Jian-liang1
1. College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China 2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
Abstract：Cr-MnOx/cordierite composites were prepared by Sol-gel, Impregnation, Co-precipitation and Rheological phase reaction method. Various technologies including X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), thermogravimetry/differential scanning calorimetry (TG/DCS), and temperature-programmed reduction (TPR) were used to characterize the structure and morphology properties of the synthesized composites. The catalytic ability test of 1,2-dichlorobenzene (o-DCB) over the catalysts was conducted in a fixed-bed flow reactor with a gas hourly space velocity (GHSV) of 30,000 h-1 to investigate the catalytic performance of the prepared composites. The results indicated that the combined Cr2O3 and Mn2O3 phases supported on cordierite possessed a special ball-shaped and better redox property in the catalyst prepared by the Co-precipitation method with a Cr/Mn atomic ratio of 2∶5, which was conducive to the increase of the synergistic effect and subsequently enhancement of the catalytic performance. Furthermore, it exhibited better stability within 60 h, which indicates a good prospect for industrial applications.
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