Abstract
This article studies the impact of the carrier type (MgO, SiO2, SiC, Al2O3, and ZrO2) and synthesis method (dry impregnation, coprecipitation, hydrothermal synthesis, and mechanochemical synthesis) on the structure, redox properties, and performance of supported CeO2 catalysts for methane oxybromination. Major distinctions are evidenced in the product distribution with respect to bulk CeO2, and the selectivity to methyl bromide (CH3Br) varies in the following order: CeO2/MgO (61–81%) > CeO2/SiC (56–73%) ≈ CeO2/SiO2 (52–71%) > bulk CeO2 (40%) ≈ CeO2/ZrO2 > CeO2/Al2O3 (28–35%) at 6–40% methane conversion. The selectivity is primarily governed by the catalyst propensity to combust CH3Br and byproduct dibromomethane (CH2Br2), which is strongly affected by the choice of the carrier. Specifically, the formation of carbon oxides is substantially suppressed over CeO2 nanoparticles stabilized on basic MgO (COx selectivity <10%) with respect to bulk CeO2 (COx selectivity ≥50%), whereas it is promoted by near atomic...
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