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-Cr90FeAlOx reached 34.89% and 29.70%, respectively. Further characterizations 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-Cr90FeAlOx 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-Cr90FeAlOx sample and less coke was formed on the catalyst. This paper opened a new way to prepare high performance and coke resistance catalyst.