Characterization and catalytic behavior of cerium oxide doped into aluminosilicophosphate glasses

Abstract

Cerium oxide is commonly used as a catalyst for the oxidation of carbon monoxide (CO) in vehicle exhaust gases, and it is used as a petroleum-cracking catalyst in oil refineries. In this study, cerium aluminosilicophosphate glasses were synthesized and various physical and catalytic properties were measured, including optical properties and decomposition temperatures, by thermogravimetric analysis (TGA) and Fourier transform infrared (FT-IR) analysis. Ce 3+ /Ce 4+ ratios and structural changes in the glass attributable to doping with ³25 mol % CeO 2 were investigated by FT-IR spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis. Changes in the catalytic properties of the glasses as a function of CeO 2 content were confirmed by changes in the decomposition starting temperatures. These temperatures decreased with increasing CeO 2 content of the glasses. We also discuss the role of CeO 2 in terms of the catalytic properties of the glass structure.

Green Synthesis of Nanostructure CeO2 Using Tea Extract: Characterization and Adsorption of Dye from Aqueous Phase

“…When two particles are in contact, due to the existence of mismatch between the lattices, the two crystals tend to rotate with each other to minimize the interfacial strain energy. Therefore, the same types of crystal planes tend to align with each other, forming a coherent interface to reduce the interfacial energy [ 60 – 62 ].…”

Cerium Containing Bioactive Glasses: A Review

“…Attempts were also made to produce glasses with higher CeO 2 contents, which resulted in an opaque material with a clear phase separation; higher CeO 2 content favors the monazite (CePO 4 ) formation in the glass system 15SiO 2 –15Al 2 O 3 –70P 2 O 5 –(0 + x )CeO 2 ( x = 0–25 mol %). 57 …”

“…Although the introduction of the rare earth decreases the viscosity of the melt, the higher amount of CeO 2 (13.5 wt %) and its low solubility in silicate glasses required higher temperature and longer isotherm. Attempts were also made to produce glasses with higher CeO 2 contents, which resulted in an opaque material with a clear phase separation; higher CeO 2 content favors the monazite (CePO 4 ) formation in the glass system 15SiO 2 –15Al 2 O 3 –70P 2 O 5 –(0 + x )­CeO 2 ( x = 0–25 mol %) …”