The catalytic degradation of volatile organic compounds (VOCs) in the presence of SO2 is still an urgent issue for industrial applications. Herein, we constructed MnOx−Co3O4 interface on Ni foam (MnxCoy-NF catalysts) to improve SO2-resistance for benzene degradation. The surface decoration of MnOx in MnxCoy-NF catalysts could generate the Co-Mn interface to tune the redox ability and active oxygen species. Mn1Co1-NF catalyst owned the high Co3+/Co2+ and Mn3+ /Mn4+ ratios as well as Olatt/Oads ratio, which is conducive to the excellent low-temperature reducibility. Benefiting from abundant interfacial active sites, Mn1Co1-NF catalyst exhibited the superior catalytic activity with the T50 and T90 values of 259 and 290 oC and SO2-tolerance for benzene degradation. In situ diffuse reflectance infrared Fourier transform spectroscopy and density functional theory calculation results revealed that surface metal sulfate species was preferentially formed on surface Mn site rather than Co site, thereby retarding the poisoning of Co-Mn interfacial active sites. Correspondingly, the ring-opening of benzoquinone into maleate species in Mn1Co1-NF catalyst was only slightly inhibited by the introduction of SO2. This work provides a novel route to design SO2-resistant catalysts for VOCs degradation in practical application.

You have access to this article

Please wait while we load your content... Something went wrong. Try again?