Investigations on the charge compensation on Ca and U substitution in CePO4 by using XPS, XRD and Raman spectroscopy

Asuvathraman, R.; Gnanasekar, K. I.; Clinsha, P.C.; Ravindran, T. R.; Kutty, K.V. Govindan

doi:10.1016/j.ceramint.2014.11.048

Cited by 40 publications

(28 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The spectra show the 2p 3/2 and 2p 1/2 components of the 2p level at around ~346.5 eV and ~350.5 eV with an intensity ratio of 2:1 among them, and separated by 4.0 eV due to spin orbit coupling. The binding energy values of Ca 2p in LCS and LCSC agree with the literature value [30], thus confirms that Ca is in +2 valence state in lattice.…”

Section: Resultssupporting

confidence: 88%

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

Wang

Cui

et al. 2018

Materials

View full text Add to dashboard Cite

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.

show abstract

Section: Resultssupporting

confidence: 88%

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

Wang

Cui

et al. 2018

Materials

View full text Add to dashboard Cite

show abstract

“…Their satellites are observed at 885,6 eV and 904,5, respectively. The spectrum is characteristic to Ce 3+ oxidation state and match well to XPS spectra reported in the literature for CePO 4 [49][50].…”

Section: Xps Measurementssupporting

confidence: 71%

“…The peaks at 887,9 eV and 898,2 eV are the satellites associated to the 3d 5/2 , whereas the highest binding energy peaks (at 906,5 eV and 916,3 eV) are the satellite peaks connected with the 3d 3/2 [38]. The peak located at 916,3 eV is typical to Ce 4+ [49][50].…”

Section: Xps Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Calcium Hydroxyapatite Supported Cobalt Catalysts for Ethanol Steam Reforming: Effect of the Incorporation Method of Active Phase

Dobosz¹,

Hull²,

Zawadzki³

2018

Studia UBB Chemia

View full text Add to dashboard Cite

ABSTRACT. Cobalt catalysts supported on calcium hydroxyapatite (Ca10(PO4)6(OH)2, HAp) and modified with cerium ions were prepared in two different ways: direct microwave-assisted hydrothermal synthesis or incipient wetness impregnation method and characterized by XRD, TEM, SEM/EDS, FT-IR and Raman spectroscopy, N2 adsorption-desorption, TPD-NH3, TPR-H2 and XPS. The results indicate that Ca under hydrothermal conditions while cobalt and cerium species are formed on the HAp surface during support impregnation. Catalytic activity of samples was tested for hydrogen production via ethanol steam reforming (SRE), and it was found that the highest hydrogen yield (over 3,5 mol H2/mol C2H5OH) and the best distribution of products were obtained for the catalyst prepared by the incipient wetness impregnation method. For this catalyst, Co species formed on the HAp surface was easier reducible than Co 2+ ions located in the HAp crystal lattice, and surface was characterized by lower acidity.

show abstract

“…43–1002), respectively. After pyrolysis, the peaks exhibit both typical (200), (120), (012) and (212) peaks indexed to CeO 2 (JCPDS No.44‐1001) and the (110), (112), (004), and (213) peaks indexed to CePO 4 (JCPDS No.32‐0199) . The high temperature treatment leads to the phase transformation of CeO 2 with better crystallinity and the formation of CePO 4 originates from the reaction between CeO 2 and phytic acid.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Hollow CeO₂/CePO₄ with Nitrogen and Phosphorus Co‐Doped Carbon Shells for Enhanced Oxygen Reduction Reaction Catalytic Activity

Liao

et al. 2018

ChemElectroChem

View full text Add to dashboard Cite

Achieving active and sustainable electrocatalysts for the oxygen reduction reaction with low cost and high performance attracts great interest in the field of fuel cells. Here, we report a facile route to prepare hollow CeO2/CePO4@N,P co‐doped carbon by pyrolyzing CeO2@polyaniline obtained in the presence of phytic acid. By virtue of the co‐doping of N and P elements as well as the existence of oxygen vacancies and the formation of a void, the product illustrated excellent catalytic activity towards the oxygen reduction reaction with onset and half‐wave potentials of 0.918 and 0.822 V, respectively, and a current density of 4.38 mA cm−2 at 0.565 V vs. RHE. Furthermore, it presented high durability and strong methanol tolerance, revealing its great potential for applications in energy conversion.

show abstract

Investigations on the charge compensation on Ca and U substitution in CePO4 by using XPS, XRD and Raman spectroscopy

Cited by 40 publications

References 23 publications

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

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

Calcium Hydroxyapatite Supported Cobalt Catalysts for Ethanol Steam Reforming: Effect of the Incorporation Method of Active Phase

Preparation of Hollow CeO₂/CePO₄ with Nitrogen and Phosphorus Co‐Doped Carbon Shells for Enhanced Oxygen Reduction Reaction Catalytic Activity

Contact Info

Product

Resources

About

Investigations on the charge compensation on Ca and U substitution in CePO4 by using XPS, XRD and Raman spectroscopy

Cited by 40 publications

References 23 publications

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

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

Calcium Hydroxyapatite Supported Cobalt Catalysts for Ethanol Steam Reforming: Effect of the Incorporation Method of Active Phase

Preparation of Hollow CeO2/CePO4 with Nitrogen and Phosphorus Co‐Doped Carbon Shells for Enhanced Oxygen Reduction Reaction Catalytic Activity

Contact Info

Product

Resources

About

Preparation of Hollow CeO₂/CePO₄ with Nitrogen and Phosphorus Co‐Doped Carbon Shells for Enhanced Oxygen Reduction Reaction Catalytic Activity