Several studies concern powder preparation and densification of doped ceria materials. The main drawback of doped ceria materials synthesized via conventional solid-state method is the high sintering temperature. This has driven several research advancements in search of other synthesis methods to increase the sinterability of doped ceria materials at low temperatures. Rare-earth-doped ceria powders were synthesized with several wet chemistry approaches such as preparation by homogeneous co-precipitation (), sol-gel () and hydrothermal methods (). Likewise, in recent study by combustion-based methods it is possible to produce monophasic nanopowders with homogeneous microstructure at lower temperatures or shorter reaction times, if compared with other conventional methods like solid-state synthesis ().
The scientists also used computational modeling at the University of Seville and the Barcelona Supercomputing Center to provide a molecular description of the methanol synthesis mechanism.The team was particularly interested in exploring a catalyst composed of copper and ceria (cerium-oxide) nanoparticles, sometimes also mixed with titania.
Large-Scale Synthesis of TiO2 Nanorods via …
Yttrium oxide-substituted ceria compounds were synthesized using two methods, i.e., conventional solid state and mechanochemical methods with starting material of CeO2 (99.9% Acros Organics) and Y2 O3 (98% Fluka-Garantie). All starting materials were dried at 500 - 600°C prior to weighing. Stoichiometric calculated amount of these materials were mixed. For mechanochemical method, appropriate total weight of stoichiometric mixtures of CeO2 with Y2O3, along with agate balls of diameter 10 mm, were placed in an agate bowl (99.9% SiO2). The mixture was then milled using a planetary ball mill (Model Pulverisette 4 vario-Planetary mill) for one hour in a suspension of ethanol at 1000 rpm. After milling, the slurry was then dried in oven at 60-70°C to evaporate off the ethanol. On the other hand, the conventional solid state method, mixtures of required molar ratios of materials were weighed and mixed manually using an agate mortar and pastle. The materials were subjected to s with variation in temperature and duration to ensure the formation of single phase materials.