Mechanism of polyol assisted ccp to hcp crystal phase conversion of nickel particles

Sevonkaev, Igor; Kumar, Ajeet; Pal, Angshuman; Goia, Dan V.

doi:10.1039/c3ra46138f

Cited by 5 publications

(2 citation statements)

References 45 publications

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“…As previously reported, 26 keeping the ccp Ni particles at $220 C for 16 hours in a polyol containing at least one glycol group converts their structure to an hcp crystal lattice. This is evidenced by the changes in their XRD spectra (Fig.…”

Section: Particle Crystallinity and Structuresupporting

confidence: 61%

Dipentaerythritol: a novel additive for the precipitation of dispersed Ni particles in polyols

et al. 2014

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Highly dispersed uniform Ni particles ranging in size from 0.1 to 1.2 mm were synthesized by reducing nickel carbonate in polyols in the presence of dipentaerythritol (DPE) and noble metal salts. DPE was essential in preventing the aggregation of nickel particles, while the noble metal ('seeding' approach) effectively tailored their size. Ferromagnetic particles with a cubic closed packed (ccp) crystal habit were obtained using short reduction times at temperatures below 200 C. Non-magnetic particles with hexagonal closed packed (hcp) structure were obtained after extended heating times (>16 hours) at temperatures above 220 C.The temperature of the reduction and heat-treatment process was adjusted by using polyols with different boiling points.

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Section: Particle Crystallinity and Structuresupporting

confidence: 61%

Dipentaerythritol: a novel additive for the precipitation of dispersed Ni particles in polyols

et al. 2014

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“…ETH and water 373.03K a water 373.15K b 2-ethylhexanoic acid (2-ETH) 501.15K b triethylene glycol (TEG) 561.15K c triethylene glycol 2-ethylhexoate (TGME) 613.58K b triethylene glycol di-2-ethylhexoate (TGDE) 670.19K b aEstimated from published data.37 b From Aspen Plus data. c From published data 38. …”

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confidence: 99%

A Novel Process for the Production of Triethylene Glycol Di-2-ethylhexoate by Reactive Distillation Using a Sulfated Zirconia Catalyst

Zhang

et al. 2020

Ind. Eng. Chem. Res.

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To solve the problem of catalyst recovery, high investment, and high energy consumption in the traditional manufacturing process of triethylene glycol di-2-ethylhexoate (TGDE), sulfated zirconia (HND-32) and reactive distillation (RD) were used in this work. Kinetics experiments for the esterification of triethylene glycol and 2-ethylhexanoic acid catalyzed by sulfated zirconia were performed at 463.15−493.15 K. The pseudo-homogeneous model was used to obtain the kinetics equation. Then, the process analysis results of the RD column indicate that there is an optimal theoretical plate number of the stripping section to obtain the highest yield of TGDE. The yield of TGDE can be enhanced to 98.15%, and 98.5 wt % TGDE can be obtained in the bottom of the RD column when the feed molar ratio is the stoichiometric ratio.

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Green synthesis of NiO nanoparticles and application in production of renewable H2 from bioethanol

Bach

Zempulski²,

Oliveira³

et al. 2022

International Journal of Hydrogen Energy

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Mechanism of polyol assisted ccp to hcp crystal phase conversion of nickel particles

Cited by 5 publications

References 45 publications

Dipentaerythritol: a novel additive for the precipitation of dispersed Ni particles in polyols

Dipentaerythritol: a novel additive for the precipitation of dispersed Ni particles in polyols

A Novel Process for the Production of Triethylene Glycol Di-2-ethylhexoate by Reactive Distillation Using a Sulfated Zirconia Catalyst

Green synthesis of NiO nanoparticles and application in production of renewable H2 from bioethanol

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