Rhenium

PEACOCK, R.D.

doi:10.1016/b978-0-08-018870-6.50007-x

Cited by 6 publications

(4 citation statements)

References 20 publications

(33 reference statements)

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“…The Re(+6)-halides (like ReF 6 , ReCl 6 ), which suit this purpose, are particularly reactive, and difficult to handle, and are also not readily available from commercial suppliers. They are extremely volatile and disintegrate upon heating at moderate temperatures, producing halogen gases …”

Section: Resultsmentioning

confidence: 99%

Colloidal ReO₃ Nanocrystals: Extra Re d-Electron Instigating a Plasmonic Response

Ghosh

Cho

et al. 2019

J. Am. Chem. Soc.

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Rhenium (+6) oxide (ReO3) is metallic in nature, which means it can sustain localized surface plasmon resonance (LSPR) in its nanocrystalline form. Herein, we describe the colloidal synthesis of nanocrystals (NCs) of this compound, through a hot-injection route entailing the reduction of rhenium (+7) oxide with a long chain ether. This synthetic protocol is fundamentally different from the more widely employed nucleophilic lysing of metal alkylcarboxylates for other metal oxide NCs. Owing to this difference, the NC surfaces are populated by ether molecules through an L-type coordination along with covalently bound (X-type) hydroxyl moieties, which enables easy switching from nonpolar to polar solvents without resorting to cumbersome ligand exchange procedures. These as-synthesized NCs exhibit absorption bands at around 590 nm (∼2.1 eV) and 410 nm (∼3 eV), which were respectively ascribed to their LSPR and interband absorptions by Mie theory simulations and Drude modeling. The LSPR response arises from the oscillation of free electron density created by the extra Re d-electron per ReO3 unit in the NC lattice, which resides in the conduction band. Further, the LSPR contribution facilitates the observation of dynamic optical modulation of the NC films as they undergo progressive electrochemical charging via ion (de)insertion. Ion (de)insertion leads to distinct dynamic optical signatures, and these changes are reversible in a wide potential range depending on the choice of the ion (lithium or tetrabutylammonium). Nanostructuring in ReO3 and the description of the associated plasmonic properties of these NCs made this optical modulation feasible, which were hitherto not reported for the bulk material. We envisage that the synthetic protocol described here will facilitate further exploration of such applications and fundamental studies of these plasmonic NCs.

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Section: Resultsmentioning

confidence: 99%

Colloidal ReO₃ Nanocrystals: Extra Re d-Electron Instigating a Plasmonic Response

Ghosh

Cho

et al. 2019

J. Am. Chem. Soc.

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“…In the present system, Re oxides are comparable and in some cases superior to MTO especially for the epoxidation of terminal olefins and dienes. The cost of the process can be significantly reduced by using these less-expensive oxorhenium catalysts in combination with BTSP which is now more available through improved preparations. , We stress, however, that despite its great thermal stability BTSP is subject to facile hydrolysis in the presence of water and acids which results in formation of hazardous 100% H 2 O 2 …”

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confidence: 99%

Bis(trimethylsilyl) Peroxide Extends the Range of Oxorhenium Catalysts for Olefin Epoxidation

Yudin

Sharpless

1997

J. Am. Chem. Soc.

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“…The electronic configuration of rhenium [Xe]4 f 14 5 d 5 6 s 2 shows that it is a highly stable metal and prevents the oxidation. The half-filled 5 d -orbital and fully occupied 6 s -orbital extend the need of highly oxidizing environment to solubilize the rhenium into aqueous solutions; whereas, the chlorine nucleus has a capacity to pull the outer electrons closer with its +7 charge. The conversion of hard metal rhenium into an aqueous species by leaching in a HCl solution in the presence of chlorine was supposed to occur in several reaction steps (eqs –), whose thermodynamic values were also calculated as follows: ,, …”

Section: Results and Discussionmentioning

confidence: 99%

Novel Aqueous Processing of the Reverted Turbine-Blade Superalloy for Rhenium Recovery

Srivastava

Kim

2016

Ind. Eng. Chem. Res.

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A preliminary study on the hydrometallurgical recovery of rhenium from an engine-reverted superalloy, CMSX-4, was performed. The novelty of this work dealt with (i) the applicability of electro-generated Cl2 in rhenium leaching and (ii) the maneuvering of the organic extractants based on the metal speciation in leach liquor. In a two-step HCl leaching, more than 98% rhenium was selectively leached in the presence of dissolved chlorine (Cl2aq. and Cl3aq. –) in the second step, which was performed after a leaching of thermal-barrier and base-alloy elements in 4 mol L–1 HCl. The leaching kinetics of rhenium indicated a shift from surface diffusion to a chemically controlled reaction with a variance in temperature from 313 to 353 K. The first use of phosphinic acid in molybdenum separation from rhenium in the leach liquor yielded a high separation value (βMo/Re = 839) using 0.067 mol L–1 extractant; whereas the mixed-phosphine oxides showed a tremendous selectivity for separating rhenium from the base-metal impurities in the Mo-depleted solution. The extraction of rhenium increased from 9% to 98% with an increase in extractant concentration from 0.005 to 0.08 mol L–1 in the organic phase. On a metal-to-metal basis, the recovery value of 93% rhenium as NH4ReO4 (9.5 g L–1 Re in the solution) demonstrated the potential of the present process.

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Rhenium

Cited by 6 publications

References 20 publications

Colloidal ReO₃ Nanocrystals: Extra Re d-Electron Instigating a Plasmonic Response

Colloidal ReO₃ Nanocrystals: Extra Re d-Electron Instigating a Plasmonic Response

Bis(trimethylsilyl) Peroxide Extends the Range of Oxorhenium Catalysts for Olefin Epoxidation

Novel Aqueous Processing of the Reverted Turbine-Blade Superalloy for Rhenium Recovery

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Rhenium

Cited by 6 publications

References 20 publications

Colloidal ReO3 Nanocrystals: Extra Re d-Electron Instigating a Plasmonic Response

Colloidal ReO3 Nanocrystals: Extra Re d-Electron Instigating a Plasmonic Response

Bis(trimethylsilyl) Peroxide Extends the Range of Oxorhenium Catalysts for Olefin Epoxidation

Novel Aqueous Processing of the Reverted Turbine-Blade Superalloy for Rhenium Recovery

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Colloidal ReO₃ Nanocrystals: Extra Re d-Electron Instigating a Plasmonic Response

Colloidal ReO₃ Nanocrystals: Extra Re d-Electron Instigating a Plasmonic Response