Low temperature chlorobenzene catalytic oxidation over MnO_x/CNTs with the assistance of ozone

Abstract

Manganese oxide supported on carbon nanotubes (MnO x /CNTs) were prepared by an impregnation method and their catalytic oxidation performances of chlorobenzene (CB) with the assistance of ozone were investigated. The experimental results indicated a synergistic effect between the MnO x /CNTs catalyst and ozone promotion for CB destruction, which promoted CB oxidation at temperatures between 80 C and 280 C. Especially at temperatures below 120 C, both CB conversion and CO 2 selectivity above 95% were achieved with an apparent activation energy of 15.0 kJ mol À1 . Moreover, MnO x /CNTs showed good stability and resistance to chlorine poisoning, which was demonstrated by stable catalytic activity for a long-term CB catalytic oxidation with 2300 ppm ozone up to 240 h.

Recent Advances in the Catalytic Oxidation of Volatile Organic Compounds: A Review Based on Pollutant Sorts and Sources

“…The results suggested that ozone efficiently promoted CB catalytic oxidation over MnO x /CNT catalysts, and CO 2 selectivity above 95% could be achieved at 80 °C (GHSV = 36 000 h –1 ). Moreover, MnO x /CNT catalysts showed good stability and resistance to Cl poisoning in the presence of ozone . The promotion effect of ozone on CB oxidation over CuO x /CNT materials was also reported …”

“…Moreover, MnO x /CNT catalysts showed good stability and resistance to Cl poisoning in the presence of ozone. 1061 The promotion effect of ozone on CB oxidation over CuO x /CNT materials was also reported. 1076…”

“…Previous work has suggested that using ozone can reduce the temperature required for oxidizing VOC by about 200 K, thus resulting in increased energy efficiency . Many studies have focused on the low-temperature oxidation of typical VOC pollutants (e.g., benzene, − toluene, − chlorobenzene, , 1,2-dichloroethane, dimethyl sulfide, , and naphthalene) in ozone-based catalytic oxidation systems.…”

Influence of Functionalized Carbon Nanotubes on Catalytic Activity of V2O5/TiO2‐CNTs for 1, 2‐Dichlorobenzene Oxidation

“…Catalysts plus adsorbents (e.g., activated carbon [4,5], zeolite [6,7], and grapheme [8]) have been proven to improve the catalytic activity by capturing more reactants onto the catalyst surface for further decomposition. CNTs are one of the excellent adsorbents for chloro-aromatic compounds [5,9] and its introduction effectively elevates the low temperature catalytic activity of several composites catalysts [10][11][12], because the presence of CNTs can: (1) enlarge the adsorption capacity and adsorption affinity of catalysts [11,12]; (2) parallelly adsorb the chloro-aromatic compounds onto the surface of CNTs [13,14]; (3) optimize the physicochemical properties of composites catalysts [10,15]. However, our previous study [15] indicated that V/Ti-CNTs catalyst achieves almost total removal of chloro-aromatic compounds mainly due to the adsorption rather than real decomposition at 150 C. Therefore, the decomposition of the adsorbed reactants needs to be further accelerated when CNTs-containing composite catalyst is used in treating chloroaromatic compounds.…”

Catalyst tolerance to SO2and water vapor of Mn based bimetallic oxides for NO deep oxidation by ozone

“…5 Ozone, characterized by long life time, strong oxidation ability, short reaction time, and large scale production, has always been regarded as the preferred oxidizing agent. 25,26 However, the relatively high investment and running cost are becoming the biggest obstacles in promoting this technique. 27 Therefore, catalysts are introduced to improve the oxidation efficiency with low ozone usage.…”