Enhanced catalytic complete oxidation of 1,2-dichloroethane over mesoporous transition metal-doped γ-Al2O3
Abbas Khaleel , Muhammad Nawaz
DOI:10.1016/j.jes.2014.09.032
Received April 28, 2014,Revised October 11, 2014, Accepted , Available online March 13, 2015
Volume 27,2015,Pages 199-209
High-surface-area mesoprous powders of γ-Al2O3 doped with Cu2+, Cr3 , and V3 ions were prepared via a modified sol-gel method and were investigated as catalysts for the oxidation of chlorinated organic compounds. The composites retained high surface areas and pore volumes comparable with those of undoped γ-Al2O3 and the presence of the transition metal ions enhanced their surface acidic properties. The catalytic activity of the prepared catalysts in the oxidation of 1,2-dichloroethane (DCE) was studied in the temperature range of 250-400℃. The catalytic activity and product selectivity were strongly dependent on the presence and the type of dopant ion. While Cu2 - and Cr3 -containing catalysts showed 100% conversion at 300℃ and 350℃, V3 -containing catalyst showed considerably lower conversion. Furthermore, while the major products of the reactions over γ-alumina were vinyl chloride (C2H3Cl) and hydrogen chloride (HCl) at all temperatures, Cu- and Cr-doped catalysts showed significantly stronger capability for deep oxidation to CO2.
