Solvothermal preparation of Mn-based catalysts for simultaneous removal of 1,2-dichlorobenzene and furan

摘要

Abstract In this study, Mn-based bimetallic oxide catalysts were synthesized via the solvothermal method. Different metals (Ce, Co and Fe) exhibited a?great impact on the physicochemical properties of catalysts, resulting in different catalytic activities?for the?simultaneous removal of 1,2-dichlorobenzene (1,2-DCB) and furan, as a?model of polychlorinated dibenzodioxins and dibenzo-furans (PCDD/Fs). Fe–MnOx presented the best catalytic activity, with?a removal efficiency of 62% for 1,2-DCB and 100% for furan at 240?°C. Several analytical techniques were employed, namely, Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), H2 temperature-programmed reduction (H2-TPR), and ammonia temperature programmed desorption (NH3-TPD). Compared with pure MnOx catalysts, Fe–MnOx shows a?higher specific surface area of 117.9?m2/g. SEM observations showed flower-like nanosheet structures for Fe–MnOx. XPS analysis indicated that Mn4+/Mn3+ and active oxygen play the key roles in the catalytic oxidation of 1,2-DCB and furan. The?catalytic activity, selectivity and stability of Mn-based bimetallic oxide catalysts for the oxidation of 1,2-DCB and furan were tested. Competition exists between 1,2-DCB and furan such that the adsorption of furan occurs prior to 1,2-DCB.