Mesoporous Nanosized Manganese Dioxides for Efficient Toluene Oxidation

Abstract

An efficient approach to synthetize the sandwich-like graphene-supported manganese oxides nanosheets (G-MnO[Formula: see text] had been developed for catalytic combustion of toluene by employing sandwich-like graphene-silica nanosheets (G-silica) as intermediates. The as-prepared G-MnO2 not only inherited the two-dimensional structure of reduced graphene, high specific surface areas, the unique mesoporous structure, good dispersion, but also possessed numerous nanoparticles of crystalline MnO2 with the size of about 5[Formula: see text]nm on each nanosheet. Such unique features had enhanced significantly the catalytic performance and catalytic stability of MnO2 for toluene oxidation. As a consequence, with the help of sandwich-like G-silica intermediates, the T[Formula: see text] and T[Formula: see text] of G-MnO2 for toluene was 240[Formula: see text]C (3.92[Formula: see text][Formula: see text][Formula: see text]mol [Formula: see text]g[Formula: see text][Formula: see text]h[Formula: see text] and 262[Formula: see text]C (7.06[Formula: see text][Formula: see text][Formula: see text]h[Formula: see text] respectively, and even after 30[Formula: see text]h at 288[Formula: see text]C, the conversion of toluene could still be maintained at 99.7% (GHSV[Formula: see text]60[Formula: see text]000[Formula: see text]mL[Formula: see text]g[Formula: see text][Formula: see text]h[Formula: see text].