Weakening Fe–O bonds through magnetron sputtering technology to enhance the catalytic performance for the oxidative dehydrogenation of 1-butene with CO2

Abstract

In heterogeneous catalysis, the mobility of lattice oxygen and the Me–O bond are key factors affecting the performance of catalysts. How to enhance the mobility of lattice oxygen and weaken the Me–O bond has attracted widespread interest among researchers. In this study, a novel magnetron sputtering (MS) technique is used to enhance the lattice oxygen mobility and weaken the Fe–O bond of the catalyst for the oxidative dehydrogenation (ODH) of 1-butene with CO₂. The sputtering Cr species were successfully embedded into the crystal lattice of Fe and the Fe–O bond was weakened. More lattice oxygen species were released. The yield and selectivity of 1, 3-butadiene were significantly improved and the coke resistance of the catalyst was also enhanced. The selectivity and yield of MS-Cr₉₀FeAlO_x reached 34.89% and 29.70%, respectively. Further characterization indicated that the Cr species maintained a high dispersion with the MS technology. The introduction of Cr species strengthened the mobility of lattice oxygen and weakened vibrations of the Fe–O bond. It was also found that the reactant molecules were more easily desorbed on the MS-Cr₉₀FeAlO_x sample, which reduced the enrichment of 1-butene on the surface of the catalyst. As a result of this, 1-butene could be effectively converted to 1,3-butadiene on the MS-Cr₉₀FeAlO_x sample and less coke was formed on the catalyst. This paper opened a new way to prepare high performance and coke resistance catalysts.