Ternary Ni-Ce-Mg-O Composites: In-Depth Optical Spectroscopy Study and Catalytic Performance in CO Oxidation

In the present work, ternary Ni-Ce-Mg-O composites containing various amounts of NiO and CeO2 were synthesized via a sol-gel approach. Aqueous solutions cerium nickel nitrates introduced at stage hydrolysis magnesium methoxide, which allowed for avoiding use expensive organic precursors. It was revealed that properties defined by complex interactions between NiO, CeO2, MgO components. order to perform an in-depth characterization prepared samples, diffuse reflectance UV–vis Raman spectroscopies applied. According results these methods, Mg2+ ions did not substitute Ce4+ in lattice. However, case Ni-containing approximately 2–3% substituted Ni2+, thus resulting formation vacancies CeO2. The strong interaction with predictably resulted NixMg1−xO solid solutions. When content sample 20 wt%, composition formed solution estimated be Ni0.60Mg0.40O. addition, presence affected texture composites, leading slight decrease specific surface area. catalytic performance examined CO oxidation reaction under prompt thermal aging conditions. choice conditions due high sensitivity response toward available metal area possible metal-support interactions.