Surface active holmia/ γ-alumina nanocatalyst: Preparation and characterization

Abstract

Holmia supported γ-alumina nanocatalyst was prepared by impregnation of γ-alumina with aqueous solution of holmium acetate hydrate Ho(CH3COO)3.3.5 H2O. The physicochemical characteristics of the nanocatalyst calcined at 600°C were established by different techniques, using surface adsorption–desorption of N2 (SBET), thermogravimetric analysis (TGA), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and UV–vis diffuse reflectance spectroscopy (DRS). The recorded optical reflectance of the sample showed that the new self-assembled nanocatalyst is excellent as host material for advanced optical applications. Moreover, the catalyst showed enhanced catalytic activity toward Isopropyl alcohol decomposition.

Photocatalytic Removal of the Endocrine Disruptor Chlorpyrifos using a ZnO.MoO3Composite Supported on Al2O3

“…This temperature is the melting point of MoO 3 . In the DSC curve, the exothermic peak was immediately followed by an endothermic event at −110 °C that was attributed to the loss of surface adsorbed water molecules and other two endothermic peaks at 462 °C and 688 °C corresponded to phase transformation of alumina and MoO 3 , respectively [34–37] …”

“…In the DSC curve, the exothermic peak was immediately followed by an endothermic event at À 110 °C that was attributed to the loss of surface adsorbed water molecules and other two endothermic peaks at 462 °C and 688 °C corresponded to phase transformation of alumina and MoO 3 , respectively. [34][35][36][37] TG curve for ZnO.MoO 3 /Al 2 O 3 composite material is depicted in Figure 5b. Weight loss observed at the first step (100 °C) was due to physically adsorbed water molecules.…”