IR, Raman and surface-enhanced Raman study of desferrioxamine B and its Fe(III) complex, ferrioxamine B

Cozar, O.; Leopold, Nicolae; Jelic, C.; Chiş, Vasile; David, L.; Mocanu, Aurora; Tomoaia-Cotişel, Maria

doi:10.1016/j.molstruc.2005.04.035

Cited by 50 publications

(35 citation statements)

References 24 publications

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“…In this work we investigated the synergistic effect of SRFA and DFOB, at environmentally relevant concentrations, on the solubilisation of Fe(III) and Cr(III) from goethite at pH 6.5. We propose that SRFA enhances the efficacy of DFOB by (i) increasing Krajnc et al (1995), Cornell and Schwertmann (2003), Edwards et al (2005), Cozar et al (2006), Prasad et al (2006), Borer et al (2009), Ohta et al (2011 and Kruft et al (2013). Vibration modes are designated as follows: v, stretching; δ, deformation; s, symmetrical; as, asymmetric.…”

Section: Discussionmentioning

confidence: 89%

Effect of desferrioxamine B and Suwannee River fulvic acid on Fe(III) release and Cr(III) desorption from goethite

Stewart

Hudson‐Edwards

Dubbin

2016

Geochimica et Cosmochimica Acta

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Section: Discussionmentioning

confidence: 89%

Effect of desferrioxamine B and Suwannee River fulvic acid on Fe(III) release and Cr(III) desorption from goethite

Stewart

Hudson‐Edwards

Dubbin

2016

Geochimica et Cosmochimica Acta

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“…Figure 2 shows the XRD patterns of the glazes with different calcium phosphate contents. There were only amorphous phase in the glazes that contained 02 wt % calcium phosphate [ 14 . Furthermore, as the calcium phosphate contents increased, the peak intensity of crystalline phase and the opacity of glazes were also increased.…”

Section: Resultsmentioning

confidence: 99%

“…With increasing of the calcium phosphate content, Ca 19 Fe 2 (PO 4 ) 14 was formed so that the opacity of glazes improved while the ratio of Fe 2+ to Fe 3+ in glazes decreased. The SEM microstructure showed that the discrete droplet phase separation structures were developed in glazes and their sizes were less than 100 nm, so the structural color was formed owing to the Rayleigh scattering.…”

Section: Discussionmentioning

confidence: 99%

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Effects of microstructure on the sky-green color in imitating ancient Jun glazes

Zhu

Shi

Wang

et al. 2016

J. Ceram. Soc. Japan

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The sky-green glaze of ancient Jun ware was successfully imitated with the addition of 4 wt % calcium phosphate for introducing the phosphorus (P) to the composition. Effects of the calcium phosphate contents on the chromaticity, precipitated phase and microstructure of sky-green glaze were investigated. Based on the analysis of colorimeter, XRD, FT-IR, XPS and SEM, a possible coloring mechanism was proposed to explain the variation of glaze colors with the increasing of calcium phosphate content. The results indicated that the addition of calcium phosphate contributed to increasing the content of calcium iron phosphate [Ca 19 to Fe 3+ and the increased size of phase separation droplets weakened the structural color, which increased the L* and b* value of glazes. Therefore, the color of sky-green glaze got more green and white gradually.

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“…In addition, the about 555 cm -1 band is attributed to the Fe-O stretching vibration. 39 From the spectra, it can be found that the bands of catalysts with different PVA concentrations are the same. Wu and co-workers 40 have reported that the PVA can be completely removed through the calcination at 450 °C.…”

Section: Ftir and Tgamentioning

confidence: 96%

Effect of PVA Concentration on Structure and Performance of Precipitated Iron-Based Catalyst for Fischer-Tropsch Synthesis

Dong

Liu

et al. 2017

J. Braz. Chem. Soc.

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Fe 2 O 3 catalysts were prepared by co-precipitation method with the assistance of polyvinyl alcohol (PVA) for Fischer-Tropsch synthesis. Effects of PVA concentration on structure and performance of the catalyst were investigated in a fixed reactor at 230-310 °C, 1.5 MPa, 2000 h -1 , and syngas H 2 /CO = 2.0. The catalysts were characterized by N 2 adsorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), H 2 or CO temperature-programmed reduction (TPR) and H 2 temperature-programmed desorption (H 2 -TPD), Fourier transform infrared (FTIR) spectra and thermogravimetric analysis (TGA). It was found that there was strong interaction between Fe and PVA, which controlled the structure of the catalyst. Among the catalysts investigated, the catalyst prepared with 15 wt.% PVA exhibited better catalytic performance due to the dispersion of iron oxides and the formation of the more active phase on the catalyst. Meanwhile, this catalyst showed the high selectivity to heavy hydrocarbons and satisfactory thermal stability.Keywords: Fischer-Tropsch synthesis, iron-based catalyst, PVA concentration, structure, stability IntroductionFischer-Tropsch synthesis (FTS), an efficient technology to convert syngas into liquid fuels and chemicals, has attracted great interest due to the shrinking of the petroleum resource in the past decades.1 Iron-based catalysts have attracted considerable focus, thanks to their low cost, high activity and excellent water-gas-shift reactivity, which match coal gasification with low H 2 /CO ratio. 2 Remarkably, three principal challenges are posed for iron-based FTS catalyst: activity, selectivity and stability. 3 It is well known that the activity, selectivity and stability of FTS catalysts rely strongly on the texture and surface properties of the resultant catalysts. 4 Most of all, the pore size of catalyst is one of the key factors, which has significant effect on the mass transfer of reactants and products, 5 the re-adsorption of the α-alkene, and the chemisorption ratio of H 2 on the surface active sites exposed. 6 Therefore, these factors are vital for the performance of catalyst in the FTS. For instance, smaller pore size of catalyst can afford high Brunauer, Emmett and Teller (BET) surface area and dispersion of the catalyst. However, diffusion effects of products were limited, resulting in light hydrocarbons as the main product for excessive hydrogenation. In contrast, the larger pore size of catalyst can facilitate the diffusion of products, and thus products of heavy hydrocarbons are obtained.7 Tao et al. 8 proposed that the FTS catalytic activity and product selectivity rely strongly on the pore size distribution of the catalysts. Xiong et al. 9 found that CO conversion increased and then decreased with the pore size in the range studied. Sun and co-workers 10,11 reported that the FTS catalytic performances were closely correlated to the pore sizes of the mesoporous zirconia.In general, the preparation process has a significant e...

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IR, Raman and surface-enhanced Raman study of desferrioxamine B and its Fe(III) complex, ferrioxamine B

Cited by 50 publications

References 24 publications

Effect of desferrioxamine B and Suwannee River fulvic acid on Fe(III) release and Cr(III) desorption from goethite

Effect of desferrioxamine B and Suwannee River fulvic acid on Fe(III) release and Cr(III) desorption from goethite

Effects of microstructure on the sky-green color in imitating ancient Jun glazes

Effect of PVA Concentration on Structure and Performance of Precipitated Iron-Based Catalyst for Fischer-Tropsch Synthesis

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