Raman spectroscopic evidence supporting the existence of Ni4(OH)44+ in aqueous, Ni(NO3)2 solutions

Carter, J Chance; Khulbe, Pramod K.; Gray, Joshua R.; Zee, J. W. Van; Angel, S. M.

doi:10.1016/j.aca.2004.03.051

Cited by 28 publications

(2 citation statements)

References 22 publications

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“…Further studies showed that the introduction of different water-soluble Ni 2+ salts, such as nickel sulfate, nickel nitrate, and nickel acetate, could also effectively enhance the activity of photocatalytic H 2 production. Among them, NiCl 2 behaves with the highest photocatalytic activity, which is due to the smaller radius of Cl – (Figure S2 of the Supporting Information). − When either insoluble Ni inorganics [such as NiO, Ni(OH) 2 , or NiS] or zero-valence nickel (Ni 0 ) powder were introduced, the increase in H 2 generation was quite small or negligible. Only when 5-fold amount of nickel powder was added, the increased effect of H 2 evolution was remarkable (Figure S3 of the Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Probe Binding Mode and Structure of the Photocatalytic Center: Hydrogen Generation by Quantum Dots and Nickel Ions

Fan

Tung

et al. 2021

Energy Fuels

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Artificial photosystems consisting of colloidal semiconductor quantum dots (QDs) and non-noble metal salts (e.g., Ni2+) show exceptional photocatalytic H2 activity. Recent studies have found the structure of the catalysts distorted during the photocatalytic H2 evolution reaction, which significantly influences the reaction kinetics. However, the in situ binding form between QDs and the catalytic center is still ambiguous. Herein, we reveal that, in the high-efficiency H2 evolution photosystem based on CdS–S2– QDs and water-soluble Ni2+ salts (pH 6.0), the Ni0 clusters formed in situ bind on the surface of QDs via a Ni–S bond to work as the real catalytic species for H2 photogeneration, manifested by a combination of X-ray photoelectron spectroscopy, electron paramagnetic resonance, X-ray absorption spectroscopy, and a set of control experiments.

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Section: Resultsmentioning

confidence: 99%

Probe Binding Mode and Structure of the Photocatalytic Center: Hydrogen Generation by Quantum Dots and Nickel Ions

Fan

Tung

et al. 2021

Energy Fuels

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“…En la Fig. se asoció con iones NO3 -procedentes del nitrato de níquel [220]. En el caso del catalizador Ni/W/Al2O3 con 10 %W (1.2 W•nm -2 ) [Fig.…”

Section: Espectroscopia Ramanunclassified

Influencia del soporte y la incorporación de ácido cítrico en catalizadores NiWS para la hidrodesulfuración profunda

Suárez Toriello

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Capítulo 4. Influencia del ácido cítrico y el pH de la solución de impregnación de níquel87 4.1 Introducción 4.2 Soluciones de impregnación 4.2.1 Predicción termodinámica de especies al equilibrio 4.2.2 Espectrofotometría UV-visible 4.2.3 Espectroscopia infrarroja 4.3 Catalizadores óxido AC-Ni/W soportados 4.3.1 Espectroscopia de reflectancia difusa UV-vis 4.3.2 Espectroscopia infrarroja 4.3.3 Espectroscopia Raman 4.3.4 Reducción a temperatura programada 4.4 Catalizadores sulfuro AC-Ni/W soportados 4.4.1 Microscopía por transmisión de electrónica de alta resolución 4.4.2 Espectroscopia fotoelectrónica de rayos-X 4.4.3 Hidrodesulfuración de 4,6-dimetildibenzotiofeno 4.4.4 Hidrodesulfuración de gasóleo 4.5 Discusión 4.5.1 Influencia del ácido cítrico-pH sobre la actividad catalítica 4.5.2 El ácido cítrico en la promoción de la fase WS 2 4.5.3 Precursores de la fase activa NiWS 4.6 Conclusiones 5 Capítulo 5. Conclusiones generales y perspectivas 5.1 Conclusiones 5.2 Perspectivas Referencias A. Apéndice A. Conversión de pixeles a datos B.

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Nickel(II) Nitrate vs. Acetate: Influence of the Precursor on the Structure and Reducibility of Ni/MCM‐41 and Ni/Al‐MCM‐41 Catalysts

et al. 2010

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Nickel(II) nitrate is the nickel precursor generally selected to prepare oxide‐supported catalysts, due to its low cost, high solubility in water and decomposition at moderate temperatures. However, its decomposition produces NOx, and it is known to melt and redistribute over the support upon heating, leading to poorly dispersed metal particles after reduction and to their partial expulsion from the porous support system. The benefits of using NiII acetate as an alternative to NiII nitrate are explored by investigating a series of model Ni catalysts (1–5 wt %) prepared from the mesoporous siliceous supports MCM‐41 and Al‐MCM‐41. The problems encountered with NiII nitrate, in terms of particle size and redistribution of nickel, are not observed with NiII acetate. In the case of MCM‐41‐supported systems, metal particles are well dispersed and remain located within the porous support. The higher pH of the impregnation solution, favoring electrostatic interactions between nickel ions and the support, may account for the higher metal dispersion. The formation of silicate‐like species in strong interaction with the support does not appear prominent on siliceous MCM‐41 when nickel acetate is the precursor, but seems to be enhanced for higher Ni contents. Finally, Al‐MCM‐41 supports are more sensitive to the exposure to nickel acetate than their siliceous analogues because acetate ions are able to extract Al ions from the support, resulting in a partial disruption of the support organization and to the formation of nickel silicate species.

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Raman spectroscopic evidence supporting the existence of Ni4(OH)44+ in aqueous, Ni(NO3)2 solutions

Cited by 28 publications

References 22 publications

Probe Binding Mode and Structure of the Photocatalytic Center: Hydrogen Generation by Quantum Dots and Nickel Ions

Probe Binding Mode and Structure of the Photocatalytic Center: Hydrogen Generation by Quantum Dots and Nickel Ions

Influencia del soporte y la incorporación de ácido cítrico en catalizadores NiWS para la hidrodesulfuración profunda

Nickel(II) Nitrate vs. Acetate: Influence of the Precursor on the Structure and Reducibility of Ni/MCM‐41 and Ni/Al‐MCM‐41 Catalysts

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