Influence of the preparation method on the activity of ceria zirconia mixed oxides for naphthalene total oxidation

Effect of preparation procedure on the formation of nanostructured ceria–zirconia mixed oxide catalysts for ethyl acetate oxidation: Homogeneous precipitation with urea vs template-assisted hydrothermal synthesis

“…Only one Raman-active F 2g mode centered at about 460 cm −1 typical of cubic structure (space group Fm-3m) is detected for both ceria materials [53]. The appearance of second, less prominent and broad band at about 600 cm −1 is usually assigned to defect-induced longitudinal optical mode (LO) of ceria due to the formation of oxygen vacancies [11,24,54]. The main Raman active mode is broader for CeO 2 prepared by urea technique which in accordance with XRD and SEM data could be both due to the decrease of crystalline size and morphology changes.…”

“…Suda et al [43] established that wet milling process provided formation of solid solution with complex morphological content. Sellick et al [11] reported minor increase of catalytic activity in naphthalene oxidation with Zr addition when precipitation by urea instead of carbonate was used. As a whole, due to structural complexity it is still a challenge to prepare well-controlled compositionally homogeneous CeO 2 -ZrO 2 mixed oxides in the nanoscale and to determine the range of Ce/Zr composition where possible.…”

Total oxidation of naphthalene at low temperatures using palladium nanoparticles supported on inorganic oxide-coated cordierite honeycomb monoliths

“…25 Among them, catalytic combustion is the most promising for the removal of PAHs from polluted air streams, due to its lower operating temperature and higher selectivity towards CO 2 [2]. For catalytic total oxidation, the types of catalysts used are based to a large extent on metals such as Pd, Pt, Ru or Co supported on 30 γ-alumina by impregnation [14], metal oxide catalysts [2,[15][16][17][18][19], mesoporous aluminosilicates with supported Pt [20] or the use of zeolites ion-exchanged with Pt [21]. Based on our previous studies [22], the use of polymer protected Pd nanoparticles supported on zeolites is one of the most promising types of 35 catalyst for the total oxidation of naphthalene, due to the low oxidation temperature reported (165-180ºC), and the high stability of the catalyst.…”

Sol-gel zirconia-based nanopowders with potential applications for sensors

“…Studies regarding oxygen sensors based on ceria-zirconia show promising results even in harsh ambient [10,11]. In this context, the binary system CeO 2 -ZrO 2 has become of very great interest [12][13][14][15][16][17].…”