Mössbauer spectroscopy of phase and crystal-chemical states of iron oxides in ceramic brick

Yatsenko, N. D.; Verevkin, K. A.; Zubekhin, A. P.

doi:10.1007/s10717-010-9256-x

“…The C1 doublet accounts for the largest proportion (42.7 %) of the iron species in Fe/rGO‐N and can be assigned to the ferric FeN x center embedded in the graphene plane . A small contribution of α‐Fe 2 O 3 (8.9 %) is observed as the C2 sextet . The other two sextets, C3 and C4, can be attributed to ferromagnetic body‐centered cubic iron (α‐Fe) and γ‐Fe 2 O 3 , which comprise approximately 21.1 and 27.3 %, respectively.…”

Section: Figurementioning

confidence: 96%

Nitrogen‐Doped Graphene‐Supported Iron Catalyst for Highly Chemoselective Hydrogenation of Nitroarenes

Wei

¹

,

Hou

²

,

Zhu

³

et al. 2018

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An itrogen-doped graphene-supported iron catalyst was used for the first time in the hydrogenation of aseries of nitroarenes to give the corresponding amines with excellent activity and chemoselectivity under mild reactionc onditions. Physicochemical characterization of the catalyst by transmission electron microscopy,X -ray diffraction, X-ray photoelectrons pectroscopy,a nd Mçssbauers pectroscopy revealed the formation of iron particles with an iron oxide core and am etallic iron shell that were coated by af ew layers of nitrogen-doped graphene. The uniques tructure of FeN x /C in the catalyst was provent o contributetothe hydrogenation activity.Heterogeneous catalytic hydrogenation plays an important role in achieving more environmentally benign and atom-economic processes in the chemical industry. [1] Noble metals such as Ru, Rh, Pd, Pt, Ir,a nd Au and base metals such as Co, Ni, Fe, and Cu have both been widely utilized as active sites in supported heterogeneousc atalysts for the hydrogenation of various unsaturated functional groups. [2] In terms of metal-involved heterogeneous hydrogenation reactions, the Horuiti-Polanyi mechanism,i nw hich the metallic atoms first catalyze scissiono ft he HÀHb ond in H 2 anda dsorb the dissociated hydrogen atoms, is generally accepted andh as been provenb y modernp hysicochemical characterization techniques andf irstprinciples calculations. [3] Consequently,ametal that maintains its metallic state insteado fa dopting an oxidized state is required for HÀHs cission and the adsorption of Ha toms. To reach this goal, aw ell-known process in the heterogeneous catalysis field has been established,t hat is,H 2 -TPR (temperature-programmed reduction), by which the minimum temperature for complete reduction of the metal oxidesi nto metallic atoms is determined to prepare metal catalysts. [4] By contrast, [a] Dr.Supporting Information and the ORCID identification number(s) for the author(s) of this article can be found underh ttps://doi.

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“…Fe(III) medium inoculated with tailings material showed significant metal reduction, observable by color change of the liquid from a dark red color to colorless liquid with black precipitate (Figure 3.1). The color change of the medium was caused by the production of FeO which is dark brown-black in color, while the colorless supernatant contained mostly dissolved Fe(II) ions (Yatsenko et al, 2010, Roh et al, 2007. The Fe(III) enrichments were performed under both near-neutral pH (7.5) and alkaline pH (9.5).…”

Section: Aerobic and Anaerobic Enrichmentsmentioning

confidence: 99%

First steps in assessing microbial involvement in the geochemical evolution of uranium mine tailings : evaluation of iron reduction potential, biofilm formation and community heterogeneity

Guran¹

2021

Preprint

0

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“…Fe(III) medium inoculated with tailings material showed significant metal reduction, observable by color change of the liquid from a dark red color to colorless liquid with black precipitate (Figure 3.1). The color change of the medium was caused by the production of FeO which is dark brown-black in color, while the colorless supernatant contained mostly dissolved Fe(II) ions (Yatsenko et al, 2010, Roh et al, 2007. The Fe(III) enrichments were performed under both near-neutral pH (7.5) and alkaline pH (9.5).…”

Section: Aerobic and Anaerobic Enrichmentsmentioning

confidence: 99%

First steps in assessing microbial involvement in the geochemical evolution of uranium mine tailings : evaluation of iron reduction potential, biofilm formation and community heterogeneity

Guran¹

2021

Preprint

0

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Mössbauer spectroscopy of phase and crystal-chemical states of iron oxides in ceramic brick

Abstract: The phase state of iron oxides in ceramic brick, obtained with reductive calcination, has been determined by Mössbauer spectroscopy.

Cited by 8 publications

References 1 publication

Nitrogen‐Doped Graphene‐Supported Iron Catalyst for Highly Chemoselective Hydrogenation of Nitroarenes

Nitrogen‐Doped Graphene‐Supported Iron Catalyst for Highly Chemoselective Hydrogenation of Nitroarenes

First steps in assessing microbial involvement in the geochemical evolution of uranium mine tailings : evaluation of iron reduction potential, biofilm formation and community heterogeneity

First steps in assessing microbial involvement in the geochemical evolution of uranium mine tailings : evaluation of iron reduction potential, biofilm formation and community heterogeneity

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