title: Selective oxidation of cyclohexane using Ce1-xMnxO2 nanocatalysts.
abstract: The Ce1-xMnxO2 nanocatalysts (x = 0.25, 0.50 and 0.75 wt.%) were synthesized by sol-gel method. The catalysts were characterized using various techniques such as XRD, N2 sorption study, DRSUV-Vis, TPR, SEM and TEM. The incorporation of Mn ions into the ceria lattice was confirmed by XRD analysis. DRUV-Vis spectra confirm the presence of Ce3+ ions in the lattice of Ce1-xMnxO2. H2-TPR study revealed the oxygen storage capacity of the catalyst. The 3D flowerlike morphology of the nanocatalysts was confirmed from FESEM and HRTEM images. The catalytic activity was tested for the vapor phase oxidation of cyclohexane using air as an oxidant. The key reaction parameters were varied to study the stability, activity and selectivity of the catalysts. The study concluded that suitable amount of manganese content is essential for the selective oxidation of cyclohexane at low temperature and Ce0.25Mn0.75O2 is the most suitable catalyst for high conversion and selectivity under the given reaction conditions. The activity of the catalyst is correlated with the characterization results.
authors.forename: A
authors.initials: A
authors.lastname: Selvamani
authors.forename: M
authors.initials: M
authors.lastname: Selvaraj
authors.forename: M
authors.initials: M
authors.lastname: Gurulakshmi
authors.forename: R
authors.initials: R
authors.lastname: Ramya
authors.forename: K
authors.initials: K
authors.lastname: Shanthi