Combustion synthesis of nanocrystalline porous CoFexAl2-xO4 spinels: Structural, textural, magnetic, and electrical properties

Narasimharao, Katabathini; Ali, Tarek T.; Abu-Zied, Bahaa M.; Alfaifi, Sulaiman Y. M.

doi:10.1016/j.ceramint.2022.12.204

Cited by 6 publications

(2 citation statements)

References 67 publications

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“…Based the results of SEM-analysis, it was shown that PVP and chitosan form composites together with the metal nanocrystals. PVP can be adsorbed on iron nanoparticles through a weak coordination bond that stabilize it [46][47][48][55][56][57][58][59][60][61][62].…”

Section: Resultsmentioning

confidence: 99%

“…The formation of magnetite occurs through an intermediate stage of formation of ferrihydrite. The advantages of this method are high product yield, narrow distribution of nanoparticles in size, and resistance to aggregation and sedimentation [13,23,32,[39][40][41][42][43][44][45][46][47][48]. Co-precipitation occurs in two stages: first, the nucleation of crystals (when critical supersaturation is reached) occurs; the second stage is the slow growth of embryos through the process of diffusion of dissolved substances to the crystal surface.…”

Section: Methodsmentioning

confidence: 99%

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Catalysts Based on Nanoscale Iron and Cobalt Immobilized on Polymers for Catalytic Oxidation of Aromatic Hydrocarbons: Synthesis, Physico-Chemical Studies, and Tests of Catalytic Activity

Dossumova,

Sassykova,

Shakiyeva

et al. 2023

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It is known that highly efficient catalysts for the catalytic oxidation of aromatic hydrocarbons can be obtained based on magnetic nanoparticles. The development of nanosized magnetically controlled catalysts for the oxidation of aromatic hydrocarbons with oxygen deserves especially close attention in the territory of the Republic of Kazakhstan, which does not have its own industrial production of oxygen-containing compounds. The aim of this work is to create catalysts based on Fe and Co nanoparticles stabilized with polymers: polyvinylpyrrolidone, chitosan, and polyethylenimine, study them by methods of physico-chemical research, and conduct preliminary tests of catalysts to predict their effectiveness. Magnetic nanoparticles were prepared by the co-precipitation method. Based on the results of the SEM analysis, it was concluded that polymers form composites together with metal nanocrystals. According to preliminary data, the most efficient oxidation of phenol in a non-flowing glass gradient-free thermostated duck-type reactor occurs on Fe3O4/chitosan, with the phenol conversion being 55–60%. Tests on the oxidation of phenol with oxygen showed a favorable prognosis for the use of such catalysts for the oxidative conversion of aromatic hydrocarbons in order to obtain valuable intermediates.

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