The influence of iron on the precipitation behaviour of nickel powder

Ntuli, Freeman; Lewis, Alison

doi:10.1016/j.ces.2007.04.001

Cited by 13 publications

(10 citation statements)

References 14 publications

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“…These findings confirm the conclusions previously reached (Ntuli and Lewis, 2007) although; further studies are required to study the nucleation mechanism in detail. The manner of the variation of the nucleation rate with seed surface area still needs to be established.…”

Section: Reduction In the Presence Of Ironsupporting

confidence: 95%

“…5a). These results confirm the surface nucleation mechanism which was proposed to occur in the presence of Fe (Ntuli and Lewis, 2007).…”

Section: Reduction In the Presence Of Ironsupporting

confidence: 89%

“…A more comprehensive description of the equipment used, preparation of the reduction solution and the experimental procedure is detailed in a previous publication (Ntuli and Lewis, 2007).…”

Section: Reduction Experiments Under Standard Operating Conditionsmentioning

confidence: 99%

“…The procedure for conducting the experiments is similar to the one described in Section 3.1 above and a comprehensive description is given in Ntuli and Lewis (2007).…”

Section: Reduction Experiments In the Presence Of Ironmentioning

confidence: 99%

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Kinetic modelling of nickel powder precipitation by high-pressure hydrogen reduction

Ntuli

Lewis

2009

Chemical Engineering Science

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Section: Reduction In the Presence Of Ironsupporting

confidence: 95%

“…5a). These results confirm the surface nucleation mechanism which was proposed to occur in the presence of Fe (Ntuli and Lewis, 2007).…”

Section: Reduction In the Presence Of Ironsupporting

confidence: 89%

“…A more comprehensive description of the equipment used, preparation of the reduction solution and the experimental procedure is detailed in a previous publication (Ntuli and Lewis, 2007).…”

Section: Reduction Experiments Under Standard Operating Conditionsmentioning

confidence: 99%

“…The procedure for conducting the experiments is similar to the one described in Section 3.1 above and a comprehensive description is given in Ntuli and Lewis (2007).…”

Section: Reduction Experiments In the Presence Of Ironmentioning

confidence: 99%

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Kinetic modelling of nickel powder precipitation by high-pressure hydrogen reduction

Ntuli

Lewis

2009

Chemical Engineering Science

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“…The 0 th and 2 nd moment obtained from the Ni-Fe solution was higher than that obtained from the Ni and Ni-Cu solution, indicating that Fe catalysed the reduction of Ni to a greater extent than Cu. Previous studies on Ni reduction have shown that Fe acts as a growth promoter and nucleating agent which might explain the high values obtained for the 0 th and 2 nd moments (Ntuli and Lewis [11]). From the SEM micrograph it seems breakage by attrition and molecular growth were more predominant than nucleation, fig.…”

Section: Evolution Of Psdmentioning

confidence: 95%

Removal and recovery of Ni, Cu and Fe from heavy metal effluent by reduction crystallization

Ntuli

Muzenda²

2011

WIT Transactions on Ecology and the Environment

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Due to the fast depletion of water reserves globally, the toxicity of heavy metals and the negative impact posed to the environment; the current focus in wastewater treatment is now on the removal and re-use of these heavy metals rather than removal and disposal in landfills. This study investigated the use of hydrazine as a reducing agent to remove and recover Ni, Cu and Fe from wastewater by reduction crystallization. Feasibility studies were carried out to test the efficiency and find the optimum operating conditions for this method and generate an understanding of the chemical and particulate process occurring. The experiments were conducted on a 20L batch reactor using synthetic solutions containing a mixture of nickel, copper and iron. The results show that hydrazine can recover and crystallize Ni, Cu and Fe into their elemental form: 99.30% Ni was removed from the Ni-solution, 99.26% Ni and 98.81% Cu were removed from the Ni-Cu solution, over 99.90% Ni and 97.70% Fe were removed from the Ni-Fe solution. Evolution of the PSD revealed that breakage and molecular growth were the predominant particulate processes occurring, a finding which was validated by the scanning electron micrographs of the powder obtained.

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Ni Particle Morphology and Support Effect in the Catalytic Decomposition of Methane: Into the Design of Novel, High Yield Catalyst for Catalytic Decomposition of Methane

Gaitan,

Li,

Tamura

et al. 2024

Adv Energy and Sustain Res

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Research on high‐surface‐area supports and synergic promoters has been made, however, there is still much room for improvement on the catalytic‐particles morphology and interaction with the support. A first approach for designing nanoplate supports to improve CDM catalysts was made. Amorphous aluminosilicates nanoplates (a‐AS.np) with an average particle size of 23.4 nm and an average height of 2.8 nm, and α‐Ni(OH)2 nanoplates (Ni.np) with an average particle size of 23.2 nm and an average thickness of 8.4 nm, were successfully synthesized, using a two‐dimensional reactor in amphiphilic phases (TRAP). Nickel loaded in a‐AS materials with different morphologies and promotion effects of lantana (La3+) & chromium (Cr3+) species were studied. La‐Cr promoted a‐AS support showed an average increase of 13% on H2 yield in severe conditions due to improved crystallization of Ni particles on mesoporous support and the electron promotion of La to Ni species. Furthermore, we evaluate the Ni.np as novel morphology support for La3+ & copper (Cu2+) species in the methane decomposition reaction. La‐Cu Ni.np showed outstanding performance and stability, a max H2 yield of 15.9% (at 700 °C), and more than 400 min of H2 generation (at 550 °C) compared to its a‐AS support counterparts.

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The influence of iron on the precipitation behaviour of nickel powder

Cited by 13 publications

References 14 publications

Kinetic modelling of nickel powder precipitation by high-pressure hydrogen reduction

Kinetic modelling of nickel powder precipitation by high-pressure hydrogen reduction

Removal and recovery of Ni, Cu and Fe from heavy metal effluent by reduction crystallization

Ni Particle Morphology and Support Effect in the Catalytic Decomposition of Methane: Into the Design of Novel, High Yield Catalyst for Catalytic Decomposition of Methane

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