Affinity order among noble metals and CeO2

Hosokawa, Saburo; Taniguchi, Makoto; Utani, Kazunori; Kanai, Hiroyoshi; Imamura, Seiichiro

doi:10.1016/j.apcata.2005.04.048

Cited by 104 publications

(105 citation statements)

References 29 publications

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“…4). The reduction peaks in the lower temperature (\120°C) are attributed to the reduction of RuO 2 to Ru [19], and the peaks in the higher temperature ([300°C) are attributed to the reduction of surface-capping oxygen anions which attach to surface Ce 4? ions in an octahedral coordination [20][21][22].…”

Section: H 2 -Tpr and H 2 -Tpdmentioning

confidence: 98%

Effect of La2O3 on Ru/CeO2-La2O3 Catalyst for Ammonia Synthesis

Liu

Wang

et al. 2009

Catal Lett

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A series of CeO 2 -La 2 O 3 supported ruthenium catalysts were prepared by co-precipitation method and the as-obtained samples were characterized by N 2 physisorption, X-ray diffraction, CO chemisorption, H 2 -TPR, H 2 -TPD and XPS. The activity test shows that ammonia concentration of the catalyst with 10% La is 13.9% at 10 MPa, 10,000 h -1 , 450°C, which is 17% higher than that of Ru/CeO 2 . La doping can improve the activity of Ru-ceria catalyst for ammonia synthesis by facilitating the reduction of oxygen which subsists in the cerium oxide surface. In addition, it can be realized that the test of catalyst stability proves the stability performance of Ru/CeO 2 -La 2 O 3 catalyst within the reaction time of 55 h.

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Section: H 2 -Tpr and H 2 -Tpdmentioning

confidence: 98%

Effect of La2O3 on Ru/CeO2-La2O3 Catalyst for Ammonia Synthesis

Liu

Wang

et al. 2009

Catal Lett

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“…From the inset, it can be seen that Rh is the least reducing metal and Pt is the most reducing metal in line with their affinity for oxygen in the CeO 2 structure. [19] Evidence for the presence of Ce 3 + cations on the transition metal/CeO 2 catalysts is presented by their XPS 3d lines in the Supporting Information. The two upper FTIR spectra in Figure 3 are those for metallic Rh/CeO 2 dosed ethanol at 300 K, collected at 300 K, and heated to 373 K. Irreversibly adsorbed CO is seen at 2050 cm À1 (linear) and 1920 cm À1 (bridging), indicating that ethanol has been partially decomposed at 300 K; Pd or Pt metal did not show this behaviour.…”

mentioning

confidence: 99%

A Phenomenological Study of the Metal–Oxide Interface: The Role of Catalysis in Hydrogen Production from Renewable Resources

et al. 2008

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“…N. Zouvelou estimated that the stability of orientaion of particles was of the following order; had suppressed grain growth compared to pure CeO 2 [20]. As shown in Figure 9, the experimentally measured crystallite size was 360 Å for pure CeO 2 calcined at 1073 K for 3 h. This was much larger than the size of CeO 2 supported with Rh, 95 Å.…”

Section: Grain Growth Of Ceo 2 With and Without Rhmentioning

confidence: 87%

Development of Three Dimensional Kinetic Monte Carlo (3D-KMC) Grain Growth Simulator Based on Tight Binding Quantum Chemical Molecular Dynamics and Its Application to the Analysis of Thermal Grain Growth of CeO2 and Rh/CeO2

Suzuki

Williams

Inaba

et al. 2013

J. Comput. Chem. Jpn.

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The electronic configuration between the interface of supported Rh and CeO 2 (111) surface was investigated by Tight Binding based Ultra Accelerated Quantum Chemical Molecular Dynamics method (TB-UAQCMD) at 1073 K.Time courses of bond energies of Rh-O (-Ce) plots for 5000 fs showed gradual increases of bond strength between oxygen and rhodium atoms in the uppersurface of the CeO 2 (111). This caused the anchoring effect of Rh-O (-Ce) bonds in the form of Rh-O (-Ce). Therefore total energies of the Ce-O bonds in the Rh/CeO 2 were found to become more stable than that in the pure CeO 2 . The activation energy of grain growth of Rh/CeO 2 nanoparticles was estimated by this deviation in these Ce-O bond energies. Experimentally observed suppression in the grain growth of Rh/CeO 2 nanoparticles relative to those without Rh was quantitatively reproduced by three dimensional Kinetic Monte Carlo method (3D-KMC).

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Affinity order among noble metals and CeO2

Cited by 104 publications

References 29 publications

Effect of La2O3 on Ru/CeO2-La2O3 Catalyst for Ammonia Synthesis

Effect of La2O3 on Ru/CeO2-La2O3 Catalyst for Ammonia Synthesis

A Phenomenological Study of the Metal–Oxide Interface: The Role of Catalysis in Hydrogen Production from Renewable Resources

Development of Three Dimensional Kinetic Monte Carlo (3D-KMC) Grain Growth Simulator Based on Tight Binding Quantum Chemical Molecular Dynamics and Its Application to the Analysis of Thermal Grain Growth of CeO2 and Rh/CeO2

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