Characterisation of Three-Way Automotive Aftertreatment Catalysts and Related Model Systems

Synthesis of CeO2–ZrO2 solid solution by glycothermal method and its oxygen release capacity

“…The Ce-based H 2 consumption at the low-temperature peak(s) increased with the decrease in the Ce content and the largest value was attained at 20 mol% of Ce for the GT samples. This phenomenon is interesting because the decrease in Ce content amplifies the redox action of the sample in spite of the fact that Ce plays a main role for the OSC, Other researchers have also reported similar phenomena [32,35]. The H 2 consumption at the high-temperature peak occurred in the Ce content region >60 mol% and increased with the increase in Ce content.…”

“…The shift of the reduction peak by repeated reduction-oxidation procedures has been reported by other researchers [35,39,[44][45][46][47]. However, reduction temperature depends on the temperature of re-oxidation [48].…”

“…When re-oxidation of a reduced Ce 0.5 Zr 0.5 O 2 sample was carried out at 700 K, subsequent reduction occurred at lower temperature than the antecedent reduction, while re-oxidation at high temperature (1273K) restored the high temperature reduction peak. Although their textual properties associated with the structural modifications occurring in the bulk or surface are assumed to be the factors [35], details of the behavior of Homogeneity of CeO 2 -ZrO 2 solid solutions is a crucial factor to increase their OSC capacity, although the presence of nanodomains of Ce-rich and Zr-rich phases that cannot be detected by conventional diffraction analysis [48,49] in apparently homogeneous sample cannot be ruled out.…”

Hydrothermal Synthesis of a Cerium(IV) Pyrochlore with Low‐Temperature Redox Properties

“…[15] These results corroborate our formulation of the pyrochlore as (Na 1/3 Ce [18] To assess the catalytic properties of (Na 1/3 Ce 2/3 ) 2 Ti 2 O 7 , we used temperature-programmed reduction/oxidation (TPR/ TPO) as a diagnostic test of redox activity (Figure 4). [19] The reduction of the sample was carried out using 10 % H 2 in N 2 , while heating from 50-500 8C at 108C min À1 , and the subsequent re-oxidation was carried out using 5 % O 2 in Ar, while heating from 30-250 8C. In the initial redox cycle, the majority of the Ce IV is reduced to Ce III at 375 8C.…”

Praseodymium-cerium oxide thin film cathodes: Study of oxygen reduction reaction kinetics

“…Cerium dioxide (ceria, CeO 2 ) and ceria related materials have been used extensively in automotive exhaust three way catalysts (TWCs) [1,2] and are prime candidates for the oxygen electrolyte and electrodes in solid oxide fuel cells (SOFCs) [3]. The latter applications are based on the high oxygen ion conductivity of ceria upon doping with acceptor ions such as trivalent Gd [4] and Sm [5,6] as well as its mixed ionic electronic conduction (MIEC) in reducing atmospheres [7].…”