Catalytic performance of V2O5–MoO3/γ-Al2O3 catalysts for partial oxidation of n-hexane1

Resumo

In the current study, a series of V₂O₅–MoO₃ catalyst supported on γ-Al₂O₃ with various V₂O₅ and MoO₃ loadings was prepared by wet impregnation technique. The characterization of prepared catalysts includes BET surface area, powder X-ray diffraction (XRD), and oxygen chemisorptions. The partial oxidation of n-hexane by air over V₂O₅–MoO₃/γ-Al₂O₃ catalysts was carried out under flow condition in a fixed bed glass reactor. The effect of V₂O₅ loading, temperature, MoO₃ loading, and n-hexane LHSV on the n-hexane conversion and the product selectivity were investigated. The partial oxygenated products of n-hexane oxidation were ethanol, acetic anhydride, acetic acid, and acetaldehyde. The 10% V₂O₅–1%MoO₃/γ-Al₂O₃ was found in most active and selective catalyst during partial oxidation of n-hexane. The results indicated that by increasing the temperature, the n-hexane conversion increases as well, although the selectivity of the products passes through a maximum by increasing the temperature.