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- This study investigated the catalytic potential of metal-loaded gamma alumina catalysts in the ozonation of 1,2-dichlorobenzene (DCB) under ambient reaction conditions. Different metal (Fe, Ni, and V) loaded gamma alumina catalysts were synthesized via wet impregnation technique and characterized using ICP-OES, FT-IR, BET, XRD, TEM, and SEM techniques. To identify the reaction products, Fourier transform infrared (FT-IR) spectroscopy and gas chromatography-mass spectrometry (GC-MS) techniques. The ozonation of 1,2-dichlorobenzene was studied within a glass reactor, where each substrate was exposed to ozone for varying time durations between 3 and 24h. The catalytic performance of a range of metal-loaded γ-Al2O3 catalysts was assessed by examining their conversion and selectivity capabilities. During the oxidative degradation of 1,2-dichlorobenzene, 3,4-dichloro-2,5-furandione (DHF) and mucochloric acid (MCA) were identified as the ozonation products. Among the studied catalysts, 2.5% Ni/γ-Al2O3 exhibited outstanding catalytic activity towards the conversion of 1,2-dichlorobenzene yielding a significant 65% conversion of 1,2-dichlorobenzene after 24h of ozonation.
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- At low temperature and pressure (20 °C and 1 atm), the oxidation of 1,2-dichlorobenzene using ozone and metal (Mn, Ni, V, and Fe) supported on TiO2 catalysts was investigated in this study. The metal loaded on TiO2 catalysts were prepared using the wet impregnation method and characterized using FT-IR, XRD, SEM-EDX, BET, TEM, and ICP-OES techniques. 1,2-dichlorobenzene was oxidized for 24 h and the sample aliquots were collected after 3, 6, 9, 12, 15, 18, and 24 h of ozonation. The ozonation products were identified using GC-MS and FT-IR techniques and the identified products were 3,4-dichloro-2,5-furandione (DHF) and mucochloric acid (MCA). The 2.5% Fe/TiO2 was found to be the most active catalyst with a percentage conversion of 73% after 24 h of ozonation. Among the identified products, MCA recorded the highest percentage selectivity after 24 h of ozonation in all the metal-supported TiO2 catalyzed ozonation reactions. The highest percentage of selectivity towards the formation of the main product was 97%.
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