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Wenjing Xu,Zhanggen Huang,Qianqian Guo,Yaqin Hou,Xiaojin Han 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5
The SO2 oxidation over V2O5/AC catalyst was studied using an in situ diffuse reflectance infrared Fouriertransformation spectroscopy technique at 120 oC. Results reveal that the surface oxygen groups could neither act asactive sites for SO2 oxidation nor supply the oxygen needed for VV↔VIV redox cycle. The vanadia species and gasphase oxygen are essential for SO2 oxidation. During SO2 oxidation over V2O5/AC, the surface hydroxyl groups involvein the formation of sulfate species. The role of water vapor in flue gas might be to supplement the hydroxyl groupsconsumed so that the SO2 oxidation could continue.
Catalytic dry oxidation of aniline, benzene, and pyridine adsorbed on a CuO doped activated carbon
Bingzheng Li,Zhiping Lei,Zhanggen Huang,Zhenyu Liu 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.3
Adsorption of aniline, benzene and pyridine from water on a copper oxide doped activated carbon (CuO/ AC) at 30℃ and oxidation behavior of the adsorbed pollutants over CuO/AC in a temperature range up to 500℃ are investigated in TG and tubular-reactor/MS systems. Results show that the AC has little activity towards oxidation of the pollutants and CuO is the active oxidation site. Oxidation of aniline occurs at 231-349℃ and yields mainly CO2, H2O and N2. Oxidation of pyridine occurs at a narrower temperature range, 255-309℃, after a significant amount of desorption starting at 150℃. Benzene desorbs at temperatures as low as 105℃ and shows no sign of oxidation. The result suggests that adsorption-catalytic dry oxidation is suitable only for the strongly adsorbed pollutants. Oxidation temperatures of CuO/AC for organic pollutants are higher than 200℃ and pollutants desorbing easily at temperatures below 200℃ cannot be treated by the method.
Qianqian Guo,Wen Jing,Shangzeng Cheng,Zhanggen Huang,Dekui Sun,Yaqin Hou,Xiaojin Han 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.11
To determine the role of sulfur groups formed on activated carbon (AC) in the selective catalytic reduction (SCR) of NO with NH3, coal-based AC was modified by H2SO4 under various conditions and then treated in N2 atmosphere at 400 oC. The resulting carbons were characterized by N2 adsorption, elemental analysis, temperature programmed desorption and X-ray photoelectron spectroscopy, and tested for the SCR of NO with NH3 in the temperature range of 30-250 oC. Results reveal that H2SO4 modification has little effect on the textural properties, but promotes the formation of sulfur and oxygen groups. The sulfur groups incorporated by H2SO4 modification are mainly sulfonic groups and then sulfates. In particular, these sulfur groups play a predominant role in improving NH3 adsorption and then enhancing the SCR activity of modified carbons above 150 oC. However, the contribution of oxygen groups to NO reduction is very limited under the conditions employed in this work.