Abstract
Lanthanum oxide/silica (La2O3/SiO2) nanocomposite was successfully synthesized through sol gel process of tetra ethoxysilane. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) verified the formation and stability of La2O3/SiO2 nanocomposite. Nanocomposite demonstrated in suppressing the intrinsic moisture absorption phenomenon of pure lanthanum oxide (La2O3). The surface morphology of La2O3 in the presence of SiO2 nano particles was determined by transmission electron microscopy (TEM). The band gap of La2O3/SiO2 nanocomposite was estimated from ultraviolet-visible (UV-Vis) spectrophotometry. The effects of SiO2 nanoparticles on the surface area, acidity-basicity and reducibility of La2O3 were investigated by N2 sorpometry, temperature-programmed desorption using CO2/NH3 (CO2-TPD/NH3-TPD) and temperature-programmed reduction using H2 (H2-TPR). Incorporation of SiO2 nanoparticles into La2O3 improved its stability and obtained new properties derived from their hybrid nature.
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