Surfactant-controlled synthesis of Pd/Ce0.6Zr0.4O2 catalyst for NO reduction by CO with excess oxygen

Chen, Lifang; González, Gibran Rivera; Wang, Jinan; Noreña, L.; Toledo, Alberto; Castillo, S.; Morán-Pineda, M.

doi:10.1016/j.apsusc.2004.09.074

Cited by 57 publications

(40 citation statements)

References 27 publications

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“…[12] The mixed oxides show a good compositional homogeneity and thermal stability after aging for 10 days.…”

Section: Resultsmentioning

confidence: 98%

“…[12,14] The six main reflections are typical of • C. At this temperature, all the organic residues were removed and detected using TGA (not shown). BET surface areas of the mixed oxides calcined at 500…”

Section: Resultsmentioning

confidence: 99%

“…[7,8] A few meso-structured surfactant-oxide composites have shown a regular pore structure even after calcination, [9] while the majority suffered from collapse of the regular pore structure after calcination. [10] There are some reports using a cationic surfactant as a template for ceria zirconia mixed oxide preparation, [11,12] but no reports describe the use of an anionic surfactant as a template in these mixed-oxide preparations, especially by the sol-gel method. Thus, this study aimed to improve textural, structural and chemical properties of ceria-based catalysts for environmental application using an anionic surfactant via the sol-gel route at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

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Anionic surfactant‐aided preparation of high surface area and high thermal stability ceria/zirconia‐mixed oxide from cerium and zirconium glycolates via sol–gel process and its reduction property

Rumruangwong

Wongkasemjit

2008

Applied Organom Chemis

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This work is focused on the ceria zirconia mixed oxide prepared through a surfactant-introduced synthesis method. High surface area nanoparticle mesoporous ceria/zirconia-mixed oxide was successfully synthesized and characterized using various techniques. High surface area mesoporous fluorite-structured CeO 2 -ZrO 2 was obtained from the elimination of surfactants upon calcination. A surface area in excess of 205.6 m 2 /g was obtained after calcination at 500• C, and dropped to 75.96 m 2 /g by heating at 900• C. Temperature-programming reduction (TPR) results showed that the lowest reduction temperature was obtained from the sample containing 40% zirconia content.

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“…[12] The mixed oxides show a good compositional homogeneity and thermal stability after aging for 10 days.…”

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anionic surfactant‐aided preparation of high surface area and high thermal stability ceria/zirconia‐mixed oxide from cerium and zirconium glycolates via sol–gel process and its reduction property

Rumruangwong

Wongkasemjit

2008

Applied Organom Chemis

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“…[24] The IR bands at 1624À1629 cm ¡1 (1629 cm ¡1 for ZrCe-0, 1624 cm ¡1 for ZrCe-0.25 and ZrEuCe-1 and 1625 cm ¡1 for the rest of the samples (ZrCe-0.5, ZrCe-1 and ZrCe-2) could be assigned to ÀHOH bending and ÀOOH stretching vibrations due to adsorbed water on ceria surface. [25,26] The broad absorption bands observed in the range of 3388À3406 cm ¡1 (3406, 3388, 3392, 3400, 3406 and 3406 cm ¡1 for the samples ZrCe-0, ZrCe-0.25, ZrCe-0.5, ZrCe-1, ZrCe-2 and ZrEuCe-1, respectively) corresponded to ÀOH stretching vibration of adsorbed/crystallised water. [25,27] There was not much variation in the shape and intensities of the band for the Zr/ ZrÀEu-doped samples when compared to pure ceria.…”

Section: Ftir Spectramentioning

confidence: 99%

Absorption and emission properties of Zr-doped nanoceria synthesised by co-precipitation-hydrothermal treatment route

Sahoo

Mohapatra

Anand

2014

Journal of Experimental Nanoscience

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A series of nanoceria samples doped with zirconium (nil to 2 mol%) and a typical sample doped with 1 mol% each of Zr and Eu were synthesised following coprecipitation-hydrothermal treatment route. The main peaks in X-ray diffraction (XRD) patterns of all the samples corresponded to (111), (200), (220) and (311) planes of cubic ceria. The Fourier transform infrared spectra showed bands which were indicative of formation of nanoceria with intercalated/adsorbed water. In Raman spectra, a sharp and intense Raman shift at around 460À462 cm ¡1 was observed for all the samples and the peak intensity decreased with increase in mol% doping of Zr. In case of ZrÀEu-doped sample the peak intensity was similar to the undoped ceria. The decrease in intensity could be due to accumulation/precipitation of more numbers of Zr ions on the surface rather than incorporation into ceria lattice. The indirect band gaps estimated from ultravioletÀvisible absorption spectra were smaller when compared to the direct ones. The smaller indirect band gaps indicate that Zr-doped nanoparticles with a higher fraction of atoms residing at the surface were available to assist the indirect electron transition from the valence band to the conduction band. Emission spectra obtained by exciting at 300 and 500 nm for all samples are discussed in details. Transmission electron microscope image of a typical sample showed mono-dispersed uniform sized single crystalline doped ceria.

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“…Precious metals (Pt, Pd and Rh) supported on different oxides are well-known as efficient oxidation catalysts, widely used for CO oxidation reaction [39][40][41][42].…”

Section: Ceria-zirconia Supported Gold Catalysts For Low-temperature mentioning

confidence: 99%

Ceria-zirconia supported gold catalysts

Rynkowski

Dobrosz-Gómez

2009

Annales UMCS, Chemistry

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This paper presents the most important achievements and conclusions coming from the contributions concerning ceria-zirconia supported Au catalysts for low temperature water gas-shift reaction and low-temperature CO oxidation. The usefulness of CeO 2 -ZrO 2 mixed oxides as supports for Au nanoparticles has been reviewed, mainly from the point of view of their contribution to those reactions. A special attention was paid to the active sites of CO oxidation and WGS reaction over Au/ceria-zirconia systems. Some aspects of the reactions mechanisms are also discussed. Ceriazirconia supported gold catalysts appear to be very promising systems, which have a potential to create a new quality in the catalysis of WGS reaction. Ceria-zirconia mixed oxides also seem to be very promising supports for Au nanoparticles in CO oxidation. They could find a practical application in ambient conditions, especially in air purification systems and a breathing apparatus. It is possible that gold could be usefully incorporated into automobile catalysts, considering that the price of other noble metals is rising rapidly. Their use in this application will, however, require demonstration of adequate stability at operating temperatures.

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Surfactant-controlled synthesis of Pd/Ce0.6Zr0.4O2 catalyst for NO reduction by CO with excess oxygen

Cited by 57 publications

References 27 publications

Anionic surfactant‐aided preparation of high surface area and high thermal stability ceria/zirconia‐mixed oxide from cerium and zirconium glycolates via sol–gel process and its reduction property

Anionic surfactant‐aided preparation of high surface area and high thermal stability ceria/zirconia‐mixed oxide from cerium and zirconium glycolates via sol–gel process and its reduction property

Absorption and emission properties of Zr-doped nanoceria synthesised by co-precipitation-hydrothermal treatment route

Ceria-zirconia supported gold catalysts

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