FT-IR Spectroscopic Study of the Oxidation of Chlorobenzene over Mn-Based Catalyst

Abstract

Adsorption and oxidation of chlorobenzene on Al2O3, TiO2-Al2O3, and MnOx/TiO2-Al2O3 have been studied by in situ Fourier transform infrared (FT-IR) spectroscopy. At room temperature, chlorobenzene is only physisorbed on Al 2O3, TiO2-Al2O3, and MnOx/TiO2-Al2O3, and gives the same IR spectrum as that for liquid-phase chlorobenzene. On Al2O3 no further interaction and reaction take place with treatment at higher temperatures (up to 773 K), while phenolates are observed for TiO2-Al2O3 and MnOx/TiO2-Al2O3 at 773 K. When the adsorbed chlorobenzene coexists with oxygen, formates are detected for Al2O3, while acetates are additionally observed for TiO2-Al2O3 above 573 K. For MnOx/TiO2-Al2O3, maleates are present at 573 and 673 K, while formates and acetates develop at 473 and 573 K. Almost all IR bands due to formates, acetates, and maleates disappear at 773 K, indicating that these oxygen-containing species are potential intermediates for the total oxidation of chlorobenzene.

Catalytic destruction of chlorobenzene over mesoporous ACeOx (A=Co, Cu, Fe, Mn, or Zr) composites prepared by inorganic metal precursor spontaneous precipitation

“…Transition metal oxides are a proper alternative owing to their excellent thermal stability, superior durability against deactivation, and lower price [7]. Nonporous zirconia-based catalysts, manganese and copper oxides, have been claimed for their effectiveness in CVOC destruction or dechlorination reactions [8][9][10]. Besides, the superior catalytic performances of nanocrystalline cobalt and iron metal oxides in CO and/or VOC oxidation have also been reported [11,12].…”

“…CB was adopted as the probe molecule as it's a typical aryl chloride and usually employed as the model reagent to predict the destruction behaviors of chlorinated aromatics and dioxins [9]. Physicochemical properties of all synthesized catalysts were characterized by XRD, N 2 sorption, FE-SEM, TEM, H 2 -TPR and O 2 -TPD.…”

Catalytic behavior and synergistic effect of nanostructured mesoporous CuO-MnOx-CeO2 catalysts for chlorobenzene destruction

“…Chlorobenzene is a typical aryl chloride and usually employed as the model reagent to predict the destruction behaviors of chlorinated aromatics as well as dioxins [34], and the effects of chlorobenzene inlet concentration and water feed concentration on catalytic activity were also evaluated. The characterization results are correlated with the catalytic behavior of CuMnCeO x catalysts, and the chlorobenzene oxidation mechanism over CuMnCeO x catalysts is further simply discussed.…”

Catalytic Oxidation of Chlorobenzene over MnO x /Al2O3-carbon Nanotubes Composites

“…Therefore, a great effort has been made for the reduction/ elimination of the PCDD/Fs emission, and selective catalytic reaction (SCR) technology has been considered as the most promising one for its excellent selectivity towards the formation of small molecules such as H 2 O, CO 2 , and HCl, in which the development of highly efficient catalysts is one of the key topics involved [2][3][4]. In the recent decades, several series of catalysts have been optimized for industry applications, for example, MnO x based catalysts [5][6][7][8], noble metal catalysts (mostly Pt-based) [9][10][11], and perovskites such as LaFeO 3 and LaMnO 3 [12,13]. Particularly MnO x is reported to possibly promote the chlorobenzene (CB) oxidation at relatively low temperatures [7,8].…”