Terbium oxide as catalyst for dehydrogenation and dehydration of alcohols and dehydrogenation of tetralin

Abstract Terbium oxide (Tb2O3) particles (NPs) were synthesized by precipitation method using ammonium carbonate as precipitation agent. Effects of precursor molarity (0.1, 0.15 and 0.2 M) on photoluminescence (PL) behaviour of the NPs were investigated. The presence of the Tb2O3 phase was confirmed by X-Ray Diffraction (XRD) and Fourier-transform infrared spectroscopy (FT-IR) analyses. Morphological investigations of the produced powders were made by Field Emission Gun-Scanning Electron Microscopy (FEG-SEM). It showed that the morphology of Tb2O3 particles transformed from the nanograin chain to bundles morphology of rod-like as the amount of precursor molarity increased. Emission spectrum were investigated by Photoluminescence (PL) Spectroscopy. All the Tb2O3 particles exhibited the strongest peak at 493 nm ascribed to 5D4-7F6 (magnetic dipole (MD), C2) transition. The increase in the number of C2 sites released from the MD transition with the increase of the precursor molarity caused a negative increase in the b* (yellowness/blueness of the emission) value in the CIE diagram, indicating that the colour shifted to the blue region. The Tb2O3 particles produced by the precipitation method exhibited novel strong cyan colour and the PL emission intensity increased with increasing molarity.

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Optical absorption of terbium oxide

physica status solidi (b) ◽

10.1002/pssb.2221170159 ◽

1983 ◽

Vol 117 (1) ◽

pp. K57-K59 ◽

Cited By ~ 4

Author(s):

A. F. Andreeva ◽

V. A. Ogorodnik

Keyword(s):

Optical Absorption ◽

Terbium Oxide

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Synthesis and structural characterization of the new rare-earth borosilicates Pr3BSi2O10 and Tb3BSi2O10

Zeitschrift für Naturforschung B ◽

10.1515/znb-2015-0143 ◽

2015 ◽

Vol 70 (12) ◽

pp. 929-934 ◽

Cited By ~ 4

Author(s):

Sebastian Bräuchle ◽

Hubert Huppertz

Keyword(s):

Rare Earth ◽

Silicon Dioxide ◽

Lattice Parameters ◽

Powder Diffraction Data ◽

Praseodymium Oxide ◽

Orthorhombic Space Group ◽

Terbium Oxide ◽

Boron Trioxide ◽

Structure Determinations

AbstractThe rare-earth borosilicates RE3BSi2O10 (RE = Pr, Tb) were synthesized under high-temperature conditions of 1600 °C in a radio frequency furnace from praseodymium oxide, terbium oxide, silicon dioxide, silicon nitride, boron trioxide, and boric acid. The structure determinations based on powder diffraction data revealed that both phases RE3BSi2O10 (RE = Pr, Tb) are isotypic to Gd3BSi2O10 [L. Chi, H. Chen, X. Lin, H. Zhuang, J. Huang, Jiegou Huaxue1998, 17, 297]. The compounds crystallize in the orthorhombic space group Pbca (no. 61) with eight formula units and the lattice parameters a = 982.9(2), b = 714.2(2), c = 2314.4(4) pm, V = 1.6247(4) nm3, Rp = 0.0231, and Rwp = 0.0354 (all data) for Pr3BSi2O10 and a = 960.5(5), b = 692.1(3), c = 2272.4(1) pm, V = 1.5106(2) nm3 for Tb3BSi2O10. The lattice parameters of Tb3BSi2O10 could be determined, but a final refinement of the powder data has not proved satisfactory. The structure of Pr3BSi2O10 exhibits eight- (Pr1) and ninefold coordinated rare-earth cations (Pr2 and 3). Layers of ortho-silicate anions [SiO4]4– and borosilicate anions [BSiO6]5– are arranged alternatingly along the c axis and the RE cations are located in between.

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Solar Thermochemical Hydrogen Production via Terbium Oxide Based Redox Reactions

International Journal of Photoenergy ◽

10.1155/2016/9727895 ◽

2016 ◽

Vol 2016 ◽

pp. 1-9 ◽

Cited By ~ 33

Author(s):

Rahul Bhosale ◽

Anand Kumar ◽

Fares AlMomani

Keyword(s):

Oxygen Partial Pressure ◽

Partial Pressure ◽

Water Splitting ◽

Thermal Reduction ◽

Terbium Oxide ◽

Heat Recuperation ◽

Solar Thermochemical ◽

Oxidation By Water ◽

Heat Released ◽

Reaction Equilibrium

The computational thermodynamic modeling of the terbium oxide based two-step solar thermochemical water splitting (Tb-WS) cycle is reported. The 1st step of the Tb-WS cycle involves thermal reduction of TbO2into Tb and O2, whereas the 2nd step corresponds to the production of H2through Tb oxidation by water splitting reaction. Equilibrium compositions associated with the thermal reduction and water splitting steps were determined via HSC simulations. Influence of oxygen partial pressure in the inert gas on thermal reduction of TbO2and effect of water splitting temperature (TL) on Gibbs free energy related to the H2production step were examined in detail. The cycle (ηcycle) and solar-to-fuel energy conversion (ηsolar-to-fuel) efficiency of the Tb-WS cycle were determined by performing the second-law thermodynamic analysis. Results obtained indicate thatηcycleandηsolar-to-fuelincrease with the decrease in oxygen partial pressure in the inert flushing gas and thermal reduction temperature (TH). It was also realized that the recuperation of the heat released by the water splitting reactor and quench unit further enhances the solar reactor efficiency. AtTH=2280 K, by applying 60% heat recuperation, maximumηcycleof 39.0% andηsolar-to-fuelof 47.1% for the Tb-WS cycle can be attained.

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A novel modified electrode based on terbium oxide and carbon nanotubes for the simultaneous determination of methyldopa and paracetamol

Analytical Methods ◽

10.1039/c6ay00969g ◽

2016 ◽

Vol 8 (23) ◽

pp. 4711-4719 ◽

Cited By ~ 5

Author(s):

Aysegul Kutluay Baytak ◽

Sehriban Duzmen ◽

Tugce Teker ◽

Mehmet Aslanoglu

Keyword(s):

Carbon Nanotubes ◽

Simultaneous Determination ◽

Glassy Carbon Electrode ◽

Modified Electrode ◽

Glassy Carbon ◽

Carbon Electrode ◽

Terbium Oxide ◽

Sensing Platform ◽

Voltammetric Sensing

A novel voltammetric sensing platform was prepared ultrasonically by modifying a glassy carbon electrode (GCE) with a composite of terbium oxide (Tb4O7NPs) nanoparticles and carbon nanotubes (CNTs) for the simultaneous determination of methyldopa (MD) and paracetamol (PR).

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