Dynamic oxygen mobility and a new insight into the role of Zr atoms in three-way catalysts of Pt/CeO2–ZrO2

Dong, Fei; Suda, Akihiko; Tanabe, Toshitaka; Nagai, Yasutaka; Sobukawa, Hideo; Shinjoh, Hirofumi; Sugiura, Masaaki; Descorme, C.; Duprez, Daniel

doi:10.1016/j.cattod.2004.06.076

Cited by 88 publications

(38 citation statements)

References 16 publications

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“…CeO 2 -based materials have various applications such as three-way catalysts (TWC), fuel cell processes, catalytic wet oxidation, de-SOx catalysis, hybrid-solar cell etc. (Dong et al, 2004b;Sahibzada et al, 1997;Larachi et al, 2002;Trovarelli et al, 1999;Lira-Cantu and Krebs, 2006). Band gap of ceria is 3.1 eV as reported by many researchers which is transparent to the visible light and absorbing only UV light from the solar spectrum where only 5 % solar light is available (Imanaka et al, 2003;Reddy et al, 2009).…”

Section: Introductionmentioning

confidence: 83%

Fabrication of iron-cerium mixed oxide: an efficient photocatalyst for dye degradation

Pradhan¹,

Parida²

2011

Int. J. Eng. Sci. Tech

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We report herein the fabrication of nanostructured and mesoporous iron-cerium mixed oxides for photocatalytic application. Phase, electronic structure and other properties of the products were characterized by both low-angle and wide-angle X-ray diffraction, diffuse reflectance spectroscopy, transmission electron microscopy, raman spectroscopy, X-ray photoelectron spectroscopy, and N 2 adsorption-desorption isotherm methods. Analytical results demonstrate that the catalyst is in the nano order and mesoporous in nature. These samples were screened for photocatalytic degradation of phenol, methylene blue (MB) and congo red (CR). About 13 % (phenol) and 93 % (MB) photodegradation were observed where as complete mineralization was obtained in case of CR. The reason for higher catalytic activity of 1:1 (Fe/Ce) sample is ascribed to their higher surface area, surface acidity which determines the active sites of the catalyst and accelerates the photocatalytic reaction.

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Section: Introductionmentioning

confidence: 83%

Fabrication of iron-cerium mixed oxide: an efficient photocatalyst for dye degradation

Pradhan¹,

Parida²

2011

Int. J. Eng. Sci. Tech

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“…Apparent activation energies for step 2 (oxygen back-spillover) in the range 8-14.0 kJ/mol were estimated in the present work. Dong et al [18] reported low activation energies (10-49 kJ/mol) for oxygen diffusion in a series of Ce x Zr 1-x O 2 mixed oxides. Bera et al [19] observed an enhanced catalytic activity over Pt and Pd/CeO 2 catalysts for the CO/ O 2 reaction with E = 31.2 kJ/mol.…”

Section: Resultsmentioning

confidence: 98%

Effects of Pd particle size on the rates of oxygen back-spillover and CO oxidation under dynamic oxygen storage and release measurements over Pd/CeO2 catalysts

Christou

Efstathiou

2007

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A kinetic mathematical model has been applied to investigate for the first time the effects of Pd particle size on the rates of oxygen back-spillover and CO oxidation during Oxygen Storage Capacity (OSC) measurements under dynamic conditions over Pd/ CeO 2 catalysts in the 500-700°C range. The dependence of the intrinsic rate constant k 1 of the CO oxidation reaction on PdO, and that of k 2 app of the oxygen back-spillover from ceria to Pd/PdO on the palladium particle size was estimated by performing curvefitting of the experimental CO and CO 2 pulse transient responses obtained. Activation energies of 8.0, 9.5 and 21.1 kJ/mol were calculated for the Eley-Rideal step of CO oxidation for the 1.3, 1.8 and 16.4 nm Pd particles, respectively, supported on CeO 2 . The transient rates of CO oxidation and oxygen back-spillover were found to decrease with increasing Pd particle size.

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“…The amount of labile oxygen (most reactive oxygen) of the catalyst is called "oxygen storage capacity" (OSC) [25]. The release of oxygen from the Ce 1 -x Zr x O 2 solid solution at low temperatures was well known as a simple and useful tool to detect the deactivation of OSC and enhancement of TWC activity [21,26]. The first reduction band of CeO 2 was at the temperature range of ca.…”

Section: Resultsmentioning

confidence: 99%

Preparation of ceria-zirconia solid solution with enhanced oxygen storage capacity and redox performance

Meng

Liu

et al. 2010

Front. Environ. Sci. Eng. China

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A new method called ultrasonic-assisted membrane reaction (UAMR) was reported for the fabrication of ceria-zirconia solid solution. A series of ceria-zirconia solid solutions with different Ce/Zr molar ratios were prepared by the UAMR method and characterized by Xray diffraction (XRD), N 2 adsorption, hydrogen temperature-programmed reduction (H 2 -TPR), scanning electron microscope (SEM), and transmission electron microscopy (TEM) techniques. The UAMR method proved to be superior, especially when the Ce/Zr molar ratio was lower than 1, in fabricating ceria-zirconia solid solutions with large BET surface area, high oxygen storage capacity (OSC), and low reduction temperature.

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Dynamic oxygen mobility and a new insight into the role of Zr atoms in three-way catalysts of Pt/CeO2–ZrO2

Cited by 88 publications

References 16 publications

Fabrication of iron-cerium mixed oxide: an efficient photocatalyst for dye degradation

Fabrication of iron-cerium mixed oxide: an efficient photocatalyst for dye degradation

Effects of Pd particle size on the rates of oxygen back-spillover and CO oxidation under dynamic oxygen storage and release measurements over Pd/CeO2 catalysts

Preparation of ceria-zirconia solid solution with enhanced oxygen storage capacity and redox performance

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