Investigations into nanostructured ceria–zirconia catalysts for soot combustion

Piumetti, Marco; Bensaid, Samir; Russo, Nunzio; Fino, Debora

doi:10.1016/j.apcatb.2015.06.018

Cited by 143 publications

(82 citation statements)

References 63 publications

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“…Worse performances (in terms of T 50% and T 90% values) were achieved for the two high-surface area samples. These results are in fair agreement with the recent literature, according to which ceriabased nanocatalysts, exhibiting highly reactive surfaces, may lead to a high oxidation activity despite their low BET surface areas [11,20,26].…”

Section: Catalytic Activity Testssupporting

confidence: 93%

“…The catalytic bed was prepared by mixing 5 mg of carbon soot, 45 mg of powdered catalyst, and 150 mg of inert silica (soot/catalyst = 5/45 wt./wt.). The mixtures were prepared using two different methods to simulate the "loose" and "tight" contact conditions, as described elsewhere (vide supra) [11]. In order to evaluate the activities for various soot-to-catalyst ratios in "loose" contact conditions, further soot-catalyst mixtures were prepared with the following ratios: 9/41, 15/35, 20/30 wt./wt.…”

Section: Catalytic Activity Testsmentioning

confidence: 99%

“…Therefore, solid catalysts are necessary to increase the oxidation rate of filter traps at low temperatures. Among the many oxidation catalysts designed since the 1980s, ceria-based catalysts appear to be the most promising candidates for DPFs due to their excellent redox behavior and high oxygen storage capacity (OSC) [11]. Moreover, the low cost of ceria (as compared to noble metals) made CeO 2 -based materials particularly attractive for Diesel exhaust aftertreatment devices [1].…”

Section: Introductionmentioning

confidence: 99%

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Contact dynamics for a solid–solid reaction mediated by gas-phase oxygen: Study on the soot oxidation over ceria-based catalysts

Piumetti

Linden

Makkee

et al. 2016

Applied Catalysis B: Environmental

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Section: Catalytic Activity Testssupporting

confidence: 93%

Section: Catalytic Activity Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Contact dynamics for a solid–solid reaction mediated by gas-phase oxygen: Study on the soot oxidation over ceria-based catalysts

Piumetti

Linden

Makkee

et al. 2016

Applied Catalysis B: Environmental

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“…According to the oxygen spillover mechanism, when more oxygen vacancies are generated, more molecular oxygen may be adsorbed on the oxygen vacancy forming surface adsorbed oxygen species and activated by dissociating into the reactive oxygen species, thereby accelerating the oxidation reaction [33]. Generally, the number of surface oxygen vacancies over solid oxide materials can be roughly estimated based on the ratio of O ads /O latt .…”

Section: Resultsmentioning

confidence: 99%

Catalytic Oxidation of Soot on a Novel Active Ca-Co Dually-Doped Lanthanum Tin Pyrochlore Oxide

Wang

Cui

et al. 2018

Materials

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A novel active Ca-Co dually-doping pyrochlore oxide La2−xCaxSn2−yCoyO7 catalyst was synthesized by the sol-gel method for catalytic oxidation of soot particulates. The microstructure, atomic valence, reduction, and adsorption performance were investigated by X-ray powder diffraction (XRD), scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), H2-TPR (temperature-programmed reduction), and in situ diffuse reflection infrared Fourier transformed (DRIFTS) techniques. Temperature programmed oxidation (TPO) tests were performed with the mixture of soot-catalyst under tight contact conditions to evaluate the catalytic activity for soot combustion. Synergetic effect between Ca and Co improved the structure and redox properties of the solids, increased the surface oxygen vacancies, and provided a suitable electropositivity for oxide, directly resulting in the decreased ignition temperature for catalyzed soot oxidation as low as 317 °C. The presence of NO in O2 further promoted soot oxidation over the catalysts with the ignition temperature decreased to about 300 °C. The DRIFTS results reveal that decomposition of less stable surface nitrites may account for NO2 formation in the ignition period of soot combustion, which thus participate in the auxiliary combustion process.

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“…The incorporation of metal dopants perturbs the material structure, creating defects that may take form as vacancies or interstitial defects. The latter are usually the prerequisite of enhanced the oxidation activity and thermal stability [3, 16–18]. Among the various elements used as dopants for ceria catalysts, zirconium and praseodymium have received a major interest over the last few years [6, 12, 16, 19].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Oxidation of CO and Soot over Ce-Zr-Pr Mixed Oxides Synthesized in a Multi-Inlet Vortex Reactor: Effect of Structural Defects on the Catalytic Activity

et al. 2016

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In the present work, ceria, ceria-zirconia (Ce = 80 at.%, Zr = 20 at.%), ceria praseodymia (Ce = 80 at.%, Pr = 20 at.%) and ceria-zirconia-praseodymia catalysts (Ce = 80 at.%, Zr = 10 at.% and Pr = 10 at.%) have been prepared by the multi-inlet vortex reactor (MIVR). For each set of samples, two inlet flow rates have been used during the synthesis (namely, 2 ml min−1 , and 20 ml min−1) in order to obtain different particle sizes. Catalytic activity of the prepared materials has been investigated for CO and soot oxidation reactions. As a result, when the catalysts exhibit similar crystallite sizes (in the 7.7–8.8 nm range), it is possible to observe a direct correlation between the Ov/F2g vibrational band intensity ratios and the catalytic performance for the CO oxidation. This means that structural (superficial) defects play a key role for this process. The incorporation of Zr and Pr species into the ceria lattice increases the population of structural defects, as measured by Raman spectroscopy, according to the order: CeO2 < Ce80Zr20 < Ce80Zr10Pr10 < Ce80Pr20. On the other hand, the presence of zirconium and praseodymium into the ceria lattice does not have a direct beneficial effect on the soot oxidation activity for these catalysts, in contrast with nanostructured ones (e.g., Ce–Zr–O nanopolyhedra, Ce–Pr–O nanocubes) described elsewhere (Andana et al. Appl. Catal. B 197: 125–137, 2016; Piumetti et al., Appl Catal B 180: 271-282, 2016).

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Investigations into nanostructured ceria–zirconia catalysts for soot combustion

Cited by 143 publications

References 63 publications

Contact dynamics for a solid–solid reaction mediated by gas-phase oxygen: Study on the soot oxidation over ceria-based catalysts

Contact dynamics for a solid–solid reaction mediated by gas-phase oxygen: Study on the soot oxidation over ceria-based catalysts

Catalytic Oxidation of Soot on a Novel Active Ca-Co Dually-Doped Lanthanum Tin Pyrochlore Oxide

Catalytic Oxidation of CO and Soot over Ce-Zr-Pr Mixed Oxides Synthesized in a Multi-Inlet Vortex Reactor: Effect of Structural Defects on the Catalytic Activity

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