Synthesis and characterization of Nd3+-doped Ce0.6Zr0.4O2 and
         its doping significance on oxygen storage capacity

Priya, N. Shanmuga; Somayaji, Chandramohan; Kanagaraj, S.

doi:10.1007/s12598-016-0698-3

Cited by 9 publications

(2 citation statements)

References 28 publications

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“…are doped into CeO 2 to generate solid solution oxides [20,21], which are beneficial to the formation of surface oxygen vacancies (Ce 3+ -X) and active oxygen (Ce 4+ -O*) and then improve the NO x storage efficiency [22,23]. It has been demonstrated that CuO can increase the adsorption and oxidation performances of NO [24]. Zeng et al discovered that CuO highly dispersed on TiO 2 displayed excellent catalytic oxidation activity of NO rather than CuO particles [25].…”

Section: Introductionmentioning

confidence: 99%

Revealing the Roles of Cu/Ba on Ce-Based Passive NOx Adsorbers

Pei

Fan

et al. 2023

Catalysts

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At present, passive NOx adsorbers (PNAs) represent one of the most effective technologies for addressing NOx emissions from diesel engines during cold-start periods. Conventional PNAs, which primarily consist of noble metals (such as Pt, Pd, and Ag) loaded on metal oxides or zeolites, share the common drawback of high production costs. Consequently, developing low-cost PNAs with outstanding NOx storage performance remains a significant challenge. In this study, a series of CuxBa5Ce adsorbents were synthesized using the impregnation method, and a monolithic adsorbent was employed to evaluate NOx storage and release performance. Techniques such as XRD, UV-Vis DRs, H2-TPR, XPS, and in situ DRIFTs confirmed the crucial roles of Cu and Ba in NOx storage and release. Specifically, the incorporation of Cu into CeO2 enhanced NOx storage performance. Moreover, in the Cu3Ba5Ce adsorbent, the addition of Ba not only introduced new storage sites and altered the stability of NOx adsorption species but also helped prevent the aggregation of CuO, thereby prolonging the complete NOx storage duration and satisfying desorption temperature requirements. The Cu3Ba5Ce adsorbent exhibited the most favorable NOx storage performance, including a complete NOx storage time of 135 s and a NOx storage efficiency exceeding 50% at 80 °C over a 10 min period. While PNAs loaded with noble metals, such as Pd/CeO2 and Pt/CeO2, exhibited NOx storage efficiencies below 50% after adsorbing for 5 min at 80 °C. Therefore, this research offered a crucial strategy for developing non-noble-metal-loaded, Ce-based PNAs.

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Section: Introductionmentioning

confidence: 99%

Revealing the Roles of Cu/Ba on Ce-Based Passive NOx Adsorbers

Pei

Fan

et al. 2023

Catalysts

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“…The value of A 600 / A 468 , which implies the oxygen defect concentration, is larger in κCZ than in CZ, indicating that more concentration of oxygen vacancies is obtained by κCZ. According to group-theory analysis, there should be 144 Raman active modes (24 A, 24E 1 , 24E 2 , 72 F) in the ideal unit cell of κ-Ce 2 Zr 2 O 8 with 96 atoms, ,, but these modes in frequency are close owing to the similar atomic species in a large unit cell, causing the overlap of peaks. However, the Raman spectrum of κCZ is asymmetrical and broad, suggesting that there is still an obvious degree of disorder in the oxygen sublattice, that is, the CZ sample does not transform in κ-Ce 2 Zr 2 O 8 structure completely.…”

Section: Resultsmentioning

confidence: 99%

Superior Pd–Rh Three-Way Catalyst: Modulating the Surface Composition by Introducing Ceria-Zirconia with Partial κ-Ce₂Zr₂O₈ Structure as Support

Yin

Deng

et al. 2022

Ind. Eng. Chem. Res.

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Surface segregation with Pd enrichment, diminishing the desired characteristics of the Rh species, remains as a key challenge for CZ (ceria-zirconia-based oxide)-supported Pd–Rh three-way catalyst under high-temperature treatment. Regulating the metal–support interactions by handling the characteristics of supports is an effective method to inhibit this deterioration phenomenon. As compared with traditional CZ, κCZ (partial κ-Ce2Zr2O8 structure) with an adequate surface area interacts strongly with Pd due to its lower oxygen vacancies energy, which stabilizes the Pd species in the oxidation states and small sizes. Meanwhile, the relative Zr-rich surface of κCZ benefits the suppression of the formation of RhO x caused by stronger electron transfer between Rh and CZ. Therefore, a strategically designed κCZ support was fabricated to tune the local composition of the Pd–Rh bimetal catalyst by the optimized interaction between Pd/Rh and κCZ. By XPS, CO FTIR and CO chemisorption tests, more highly reactive Pdδ+(δ > 2) species in smaller sizes could be maintained on κCZ (46.52%, 17.4 nm) comparing with that on CZ (37.38%, 23.1 nm) due to the stronger Pd–O–Ce/Zr bonds. Meanwhile, more Rh species in active sates (Rh0) could be kept on κCZ (19.10%) than on CZ (13.11%) because of the decrease of Rh–O–Ce interfaces. As a result, the local composition of Pd–Rh/κCZ was optimized. Also the Pd-rich surface was avoided as compared with the Pd–Rh/CZ surface, and a greater proportion of active components (Rh0 and Pdδ+) was exposed. Then, an advanced Pd–Rh/κCZ catalyst for TWC performance was designed, specifically, and after high thermal aging treatment, the T 50 and T 90 of the four pollutants (CO, NO, C3H8, and C3H6) were lower by more than 20 °C as compared to that for Pd–Rh/CZ.

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One-step synthesis of Cl-doped Li4Ti5O12 during electrode fabrication process with improved specific capacity

Wang,

Zhang

et al. 2024

J Solid State Electrochem

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Synthesis and characterization of Nd3+-doped Ce0.6Zr0.4O2 and its doping significance on oxygen storage capacity

Cited by 9 publications

References 28 publications

Revealing the Roles of Cu/Ba on Ce-Based Passive NOx Adsorbers

Revealing the Roles of Cu/Ba on Ce-Based Passive NOx Adsorbers

Superior Pd–Rh Three-Way Catalyst: Modulating the Surface Composition by Introducing Ceria-Zirconia with Partial κ-Ce₂Zr₂O₈ Structure as Support

One-step synthesis of Cl-doped Li4Ti5O12 during electrode fabrication process with improved specific capacity

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Synthesis and characterization of Nd3+-doped Ce0.6Zr0.4O2 and its doping significance on oxygen storage capacity

Cited by 9 publications

References 28 publications

Revealing the Roles of Cu/Ba on Ce-Based Passive NOx Adsorbers

Revealing the Roles of Cu/Ba on Ce-Based Passive NOx Adsorbers

Superior Pd–Rh Three-Way Catalyst: Modulating the Surface Composition by Introducing Ceria-Zirconia with Partial κ-Ce2Zr2O8 Structure as Support

One-step synthesis of Cl-doped Li4Ti5O12 during electrode fabrication process with improved specific capacity

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Product

Resources

About

Superior Pd–Rh Three-Way Catalyst: Modulating the Surface Composition by Introducing Ceria-Zirconia with Partial κ-Ce₂Zr₂O₈ Structure as Support