Synthesis of mixed Mn–Ce–Ox one dimensional nanostructures and their catalytic activity for CO oxidation

Abstract

One dimensional Mn–Ce–Ox composite nanomaterials with various Mn contents were synthesized successfully by a hydrothermal method. The impacts of Mn contents on their morphologies and physical properties were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The analysis reveals that the obtained composites are one-dimensional (1D) rod-like nanostructures. The catalytic behaviors of Mn–Ce–Ox nanomaterials were investigated for CO oxidation. The Mn–Ce–Ox catalysts were found to be more active than catalysts based on ceria alone. The catalytic activities of all one dimensional Mn–Ce–Ox materials for CO conversion are quite high (142<T50%<229°C). Among the obtained nanocatalysts, the Mn–Ce–Ox composite nanomaterials with 40wt% Mn exhibit the best catalytic activity and the 50% CO conversion can be reached at 142°C. The presence of transition metal element Mn can promote the production of oxygen vacancies and improve oxygen mobility, which result in enhancing the oxygen-storage capacity of the one dimensional Mn–Ce–Ox materials and its catalytic performance for CO conversion.