Third order nonlinear optical properties of Mn doped CeO2 nanostructures

Rahulan, K. Mani; Flower, N. Angeline Little; Sujatha, R. Annie; Priya, P. M.; Gopalakrishnan, C.

doi:10.1016/j.optlastec.2017.11.041

Cited by 14 publications

(5 citation statements)

References 23 publications

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“…3 presents XRD patterns of the prepared samples before (a) and after reaction (b). Mn-, Cu-, and Zn-doped CeO 2 samples had peaks in approximately the same position corresponding to (111), (200), (220), (311), (222), and (400) planes according to the XRD patterns, being in agreement with Joint Committee on Powder Diffraction Standards (JCPDS) cards [28][29][30] report by Takalkar [31] for the crystallite size of CeCu, CeZn, and CeMn in the order of CeCu > CeMn > CeZn. XRD patters of samples after ESR (Fig.…”

Section: Catalyst Characterizationsupporting

confidence: 77%

“…3 presents XRD patterns of the prepared samples before (a) and after reaction (b). Mn-, Cu-, and Zn-doped CeO 2 samples had peaks in approximately the same position corresponding to (111), ( 200), ( 220), (311), (222), and (400) planes according to the XRD patterns, being in agreement with Joint Committee on Powder Diffraction Standards (JCPDS) cards [28][29][30]. Differences in intensity or a little position shift com-pared to CeO 2 indicated the formation of Mn-, Cu-, and Zn-doped CeO 2 and peaks related to CuO, ZnO, and Mn x O y could be justified by more dopant from the CeO 2 lattice, so remaining on the surface was detected.…”

Section: Catalyst Characterizationsupporting

confidence: 77%

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Ethanol Steam Reforming on Ce_xM_yO₂ (M: Cu, Zn, and Mn) Solid Solution Catalysts

Sohrabi

Irankhah

2020

Chem Eng & Technol

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The effects of Cu, Zn, and Mn on CeO2 in ethanol steam reforming for hydrogen production were evaluated. Solid solution catalysts were analyzed by Brunauer‐Emmett‐Teller method, X‐ray diffraction, temperature‐programmed reduction, scanning electron microscopy, and energy dispersive X‐ray. CeMn oxide showed the highest conversion and hydrogen yield. The entrance of Mn to the ceria lattice could enhance the catalyst reducibility. An increase of the Ce/Mn ratio led to high methane selectivity. Mn conducted the reaction to more CO2 generation and was also an effective metal for ethanol steam reforming reaction by adsorbing steam and the ability of oxygen mobility. Ce0.3Mn0.7 oxide provided moderate ethanol conversion and hydrogen yield. The catalyst exhibited higher conversion but lower hydrogen yield by adding Ni.

show abstract

Section: Catalyst Characterizationsupporting

confidence: 77%

“…3 presents XRD patterns of the prepared samples before (a) and after reaction (b). Mn-, Cu-, and Zn-doped CeO 2 samples had peaks in approximately the same position corresponding to (111), ( 200), ( 220), (311), (222), and (400) planes according to the XRD patterns, being in agreement with Joint Committee on Powder Diffraction Standards (JCPDS) cards [28][29][30]. Differences in intensity or a little position shift com-pared to CeO 2 indicated the formation of Mn-, Cu-, and Zn-doped CeO 2 and peaks related to CuO, ZnO, and Mn x O y could be justified by more dopant from the CeO 2 lattice, so remaining on the surface was detected.…”

Section: Catalyst Characterizationsupporting

confidence: 77%

Ethanol Steam Reforming on Ce_xM_yO₂ (M: Cu, Zn, and Mn) Solid Solution Catalysts

Sohrabi

Irankhah

2020

Chem Eng & Technol

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“…CeO 2 has a cubic structure of the fluorite type with space group Fm-3m, formed by one Ce 4+ cation coordinated by eight O 2− anions [15]. In the literature, it is reported several promising applications for CeO 2 as a catalyst to reform vapor of propylene glycol in microreactors [16], gas sensor [17], opto-magnetic [18], catalysis of NO reduction [19], CO oxidation [20], electrolyte for solid oxide fuel cells [21,22], antibacterial agent [23,24] and phosphors [25][26][27], for example.…”

Section: Introductionmentioning

confidence: 99%

Fast and continuous obtaining of Eu3+ doped CeO2 microspheres by ultrasonic spray pyrolysis: characterization and photocatalytic activity

Santiago

Neto

Longo

et al. 2019

J Mater Sci: Mater Electron

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In this work, CeO 2 :xEu 3+ (x = 0, 0.01, 0.02, 0.04 and 0.08 mol%) microspheres were obtained by the fast and continuous ultrasonic spray pyrolysis method. Powders were characterized by X-ray diffraction (XRD), X-ray fluorescence analysis (XRF), scanning electronic microscopy (FESEM), Raman spectra, UV-Visible spectroscopy (UV-Vis) and photocatalytic activity. All XRD patterns were indexed by the cubic structure of the fluorite type, without the presence of secondary phases, indicating success in the Eu 3+ doping in the CeO 2 structure. In addition, The XRF analysis confirmed the presence of Eu in the CeO 2 powders. In the Raman spectra of the samples occurs the vibrational mode F 2g , which is a characteristic band of materials with the fluorite type structure. Moreover, as the Eu 3+ ion increased, it was noticed the appearance of additional bands referring to oxygen vacancies. FESEM showed that the CeO 2 :xEu 3+ particles have a spherical morphology with homogeneous chemical composition and particle size between 73 and 1560 nm. It can be seen a slight increase of defects in their morphology as the Eu 3+ ion increases. The band gap varies between 3.22 and 3.28 eV, being influenced by defects in oxygen vacancies and the concentration of Ce 3+ ion. The addition of Eu 3+ generates the introduction of intermediary levels in the conduction band of CeO 2 , besides increasing the reactive species effects, favoring the photocatalysis of Rhodamine B dye.

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“…Zhou et al 40 were able to obtain CeO 2 nanoparticles (NPs) with cubic morphologies by the hydrothermal method using Na 3 PO 4 • 12H 2 O as a surfactant, but at a synthesis temperature of 200 °C and a synthesis time of 20 h after calcination at 500 °C for 4 h. In this sense, the microwave-assisted hydrothermal route was found to be more advantageous for the preparation of ceria-based NPs because of the reduced costs of the synthesis procedure. On the basis of the analysis by Chen and Chen, 41 Mn doping tends to enhance grain boundary mobility due to the large distortion of the surrounding lattice, facilitating the migration of defects from the matrix (i.e., CeO 2 ), an ionic radius value that is much smaller than that of Ce 4+ , and the relaxation of strain induced by the substitution of Ce 4+ with ions with smaller radii. 42 Therefore, the nanometric behavior of the particles can be perceived with an overall reduction of their sizes with an increase in Mn content, which in turn inhibits grain growth due to the reduced number of effective shocks by the action of [MnO 4 ] clusters with a lower electron density.…”

Section: Resultsmentioning

confidence: 99%

Manganese Defective Clustering: Influence on the Spectroscopic Features of Ceria-Based Nanomaterials

et al. 2023

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The influence of manganese modification on the spectroscopic features of manganese-doped CeO 2 systems synthesized by the microwave-assisted hydrothermal route and their correlation with the presence of O defective structures were verified, focusing on their interaction with poisonous atmospheres. Raman and electron paramagnetic resonance studies confirmed the presence of defective clusters formed by dipoles and/or quadrupoles. The number of paramagnetic species was found to be inversely proportional to the doping concentration, resulting in an increase in the Mn 2+ signal, likely due to the reduction of Mn 3+ species after the interaction with CO. X-ray photoelectron spectroscopy data showed the pure system with 33% of its cerium species in the Ce 3+ configuration, with an abrupt decrease to 19%, after the first modification with Mn, suggesting that 14% of the Ce 3+ species are donating one electron to the Mn 2+ ions, thus becoming nonparamagnetic Ce 4+ species. On the contrary, 58% of the manganese species remain in the Mn 2+ configuration with five unpaired electrons, corroborating the paramagnetic feature of the samples seen in the electron paramagnetic resonance study.

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Third order nonlinear optical properties of Mn doped CeO2 nanostructures

Cited by 14 publications

References 23 publications

Ethanol Steam Reforming on Ce_xM_yO₂ (M: Cu, Zn, and Mn) Solid Solution Catalysts

Ethanol Steam Reforming on Ce_xM_yO₂ (M: Cu, Zn, and Mn) Solid Solution Catalysts

Fast and continuous obtaining of Eu3+ doped CeO2 microspheres by ultrasonic spray pyrolysis: characterization and photocatalytic activity

Manganese Defective Clustering: Influence on the Spectroscopic Features of Ceria-Based Nanomaterials

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Third order nonlinear optical properties of Mn doped CeO2 nanostructures

Cited by 14 publications

References 23 publications

Ethanol Steam Reforming on CexMyO2 (M: Cu, Zn, and Mn) Solid Solution Catalysts

Ethanol Steam Reforming on CexMyO2 (M: Cu, Zn, and Mn) Solid Solution Catalysts

Fast and continuous obtaining of Eu3+ doped CeO2 microspheres by ultrasonic spray pyrolysis: characterization and photocatalytic activity

Manganese Defective Clustering: Influence on the Spectroscopic Features of Ceria-Based Nanomaterials

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Product

Resources

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Ethanol Steam Reforming on Ce_xM_yO₂ (M: Cu, Zn, and Mn) Solid Solution Catalysts

Ethanol Steam Reforming on Ce_xM_yO₂ (M: Cu, Zn, and Mn) Solid Solution Catalysts