Ozone-catalytic oxidation for gaseous 1,2-dichloroethane in air over Pt/Al2O3 catalyst

摘要

The catalytic oxidation of 1,2-dichloroethane (DCEA) using Pt/Al2O3 with and without ozone (noted as OZCO and COXI, respectively) was carried considering the key operation parameters of reaction temperature (T), space velocity (SV) of catalyst and inlet concentration of O-3 (C-O3). The results indicate that OZCO decreases the reaction temperature and enhances the conversion of DCEA (X) to form CO2, HCI and Cl-2 comparing with COXI. At 200 ppmv CO3 and 125,000 1/h SV, 50% and 90% conversions of DCEA via OZCO are achieved at 430 and 610 K, while those via COXI are reached at 582 or 640 K, respectively. The mineralization of carbon in DCEA to form CO2 (Y-CO2) with ozone (e.g. 90% at 620 K) is systematically higher than that without ozone (e.g. 60% at 620 K). The conversions of chlorine atom in DCEA to Cl in HCl and Cl-2 are about 62.5% and 37% for OZCO at 625 K with -100% Y-CO2, which are higher than 51.5% and 10.3% for COXI at 645 K with 97% Ycov respectively. Thus the conversions of carbon and chlorine are near completion, indicating the effectiveness of OZCO for destructing the chlorine-containing pollutant of DCEA. (C) 2015 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.