XANES study of rhenium oxide compounds at the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>L</mml:mi><mml:mn>1</mml:mn></mml:msub></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>L</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>absorption edges

Tougerti, Asma; Cristol, Sylvain; Berrier, Élise; Briois, Valérie; Fontaine, Camille La; Villain, F.; Joly, Yves

doi:10.1103/physrevb.85.125136

Cited by 49 publications

(34 citation statements)

References 21 publications

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“…Re L 3 -edge XANES spectra collected from the model compounds selected for the present study (Figure 4) match the spectral data published on rhenium oxide compounds, starting with works dated from the seventies [22] to the nineties [19] [20] [23], up to a recent publication [24].…”

Section: Resultssupporting

confidence: 49%

“…The intense self-absorption peak at the absorption edge-the so-called "white line" [25]-has an amplitude that depends essentially from the occupation of the 5d electron level of rhenium atoms [24]. Accordingly, its energy is sensitive to the formal valence of rhenium ions: Re 6+ in ReO 3 (10,544 eV) and Re 7+ in the other two model compounds (10542.5 eV).…”

Section: Resultsmentioning

confidence: 99%

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Towards the Recovery of By-Product Metals from Mine Wastes: An X-Ray Absorption Spectroscopy Study on the Binding State of Rhenium in Debris from a Centennial Iberian Pyrite Belt Mine

Figueiredo¹,

Silva

Veiga³

et al. 2014

JMMCE

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Rhenium is a very scarce element, occurring in the Earth's crust mainly carried by molybdenite (MoS 2 ). Due to a very low availability comparative to actual industrial demand, rhenium is nowadays one of the most expensive mineral commodities and an increased interest is focused on exploring residues resulting from a long-term mining, particularly of sulphide ore deposits. It is therefore noteworthy to assign the presence of rhenium (in a concentration up to 3 ppm) in the waste materials from the old sulphur factory at the abandoned mine of São Domingos (Iberian Pyrite Belt, Southeast Portugal), exploited since the Roman occupation of Iberia. Aiming at a potential sustainable recovery of rhenium as a by-product, X-ray near-edge absorption spectroscopy (XANES) was applied to clarify the Re-binding and mode of occurrence by comparing Re L 3 -edge XANES spectra obtained from mine waste samples (previously fully characterized by X-ray laboratory techniques) with similar spectra collected from Re-rich molybdenites (Mo 1−x Re x S 2 ) and from Re-O model compounds configuring various valences and coordination environments of rhenium ions. Obtained results are commented, ruling out a possible Re-S binding and rather conforming with the binding of rhenium to oxygen in the analysed mine waste materials.

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Section: Resultssupporting

confidence: 49%

Section: Resultsmentioning

confidence: 99%

Towards the Recovery of By-Product Metals from Mine Wastes: An X-Ray Absorption Spectroscopy Study on the Binding State of Rhenium in Debris from a Centennial Iberian Pyrite Belt Mine

Figueiredo¹,

Silva

Veiga³

et al. 2014

JMMCE

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“…25% fraction of Pt species was oxides and the remaining part was metal in the catalyst, using the spectra of Pt foil and PtO 2 [33]. As to Re L 3 -edge, intensity of the white line for Pt-Re/ZrO 2 corresponded to those for tetra-to hexa-valent oxides [34,35]. These oxide species could be formed by the passivation in the catalyst preparation, due to high dispersion of metals.…”

Section: Characterization Of Pt/zro 2 and Pt-re/zro 2 Catalystsmentioning

confidence: 99%

Selective hydrodeoxygenation of lignin-related 4-propylphenol into n-propylbenzene in water by Pt-Re/ZrO2 catalysts

et al. 2014

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Abstract:Bimetallic Pt-Re/ZrO 2 catalysts were developed for the selective hydrodeoxygenation of 4-propylphenol as a lignin model to n-propylbenzene in water. The addition of Re to Pt/ZrO 2 improved the catalyst stability and product selectivity. Reaction temperature greatly affected not only reaction efficiency but also product distribution. n-Propylbenzene was obtained in up to 73% yield with ca. 80% selectivity. After the reaction, the catalyst was deactivated possibly due to waterinduced wrapping of Pt nanoparticles in ZrO 2 . The reaction may involve the hydrogenation of 4-propylphenol to 4-propylcyclohexanol, followed by the dehydration to give 4-propylcyclohexene and the subsequent dehydrogenation to n-propylbenzene.

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“…[19,20] Rhenium has remained of interest because of its use as a surface catalyst for a variety of organic syntheses. [21] Similarly, technetium has remained of interest since its discovery because of its role in nuclear processes and concern over its long-term environmental disposal. Several studies have been made of the Raman spectra of pertechnetate (TcO 4 À ) in solution.…”

Section: Introductionmentioning

confidence: 99%

Raman analysis of perrhenate and pertechnetate in alkali salts and borosilicate glasses

Gassman

McCloy

Soderquist

et al. 2014

J Raman Spectroscopy

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Sodium borosilicate glasses containing rhenium or technetium were fabricated and their vibrational spectra studied using confocal Raman microscopy. Glass spectra were interpreted relative to new high-resolution spectra of pure crystalline NaReO 4 , KReO 4 , NaTcO 4 , and KTcO 4 salts. Spectra of perrhenate and pertechnetate glasses exhibited sharp Raman bands, characteristic of crystalline salt species, superimposed on spectral features of the borosilicate matrix. At low concentrations of added KReO 4 or KTcO 4, the characteristic pertechnetate and perrhenate features are weak, whereas at high additions, sharp peaks from crystal field-splitting and C 4h symmetry dominate glass spectra, clearly indicating ReO 4 À or TcO 4 À is locally coordinated with K and/or Na. Peaks indicative of both K and Na salts are evident in many Raman spectra, with the Na form being favored at high concentrations of the source chemicals, where more K + is available for ion exchange with Na + from the base glass. The observed ion exchange likely occurred within depolymerized channels where nonbridging oxygens create segregation from the glass network in regions containing anions such as ReO 4 À and TcO 4 À as well as excess alkali cations. Although this anion exchange provides evidence of chemical mixing in the glass, it does not prove the added salts were homogeneously incorporated in the glass. The susceptibility to ion exchange from the base glass indicates that long-term immobilization of Tc in borosilicate glass must account for excess charge compensating alkali cations in melt glass formulations. Published 2014. This article is a U. S. Government work and is in the public domain in the USA.Additional supporting information may be found in the online version of this article at the publisher's web site.

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XANES study of rhenium oxide compounds at theL1andL3absorption edges

Cited by 49 publications

References 21 publications

Towards the Recovery of By-Product Metals from Mine Wastes: An X-Ray Absorption Spectroscopy Study on the Binding State of Rhenium in Debris from a Centennial Iberian Pyrite Belt Mine

Towards the Recovery of By-Product Metals from Mine Wastes: An X-Ray Absorption Spectroscopy Study on the Binding State of Rhenium in Debris from a Centennial Iberian Pyrite Belt Mine

Selective hydrodeoxygenation of lignin-related 4-propylphenol into n-propylbenzene in water by Pt-Re/ZrO2 catalysts

Raman analysis of perrhenate and pertechnetate in alkali salts and borosilicate glasses

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