Effect of Li2O-doping of nanocrystalline CoO/Fe2O3 on isopropanol conversion

El-Shobaky, H.G.; Ali, Seham M.; Hassan, Neven Ahmed

doi:10.1016/j.mseb.2007.07.072

Cited by 6 publications

(6 citation statements)

References 21 publications

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“…[5][6][7] In addition, increasing interest for cobalt ferrite nanomaterials was focused on their catalytic properties for some important reactions, such as preparation of highly pure hydrogen, 8 phenol alkylation, 9 carbon nanotubes growth, 10,11 and dehydrogenation of isopropanol. 12 CoFe 2 O 4 has a face-centered cubic structure with a large unit cell containing eight formula units. There are two kinds of lattices for cation occupancy: tetrahedral (A) and octahedral (B) coordination sites.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis and Characterization of Cobalt Ferrite Nanocrystals via a Simple Reduction−Oxidation Route

et al. 2008

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In this paper, a facile synthetic route of cobalt ferrite nanocrystals with narrow size distribution was reported.The key feature of this method involved a very rapid mixing of reducible metal cations with sodium borohydride and simultaneous reduction in a colloid mill, which is followed by a slow oxidation in a separate hydrothermal treatment. The microstructural and magnetic characteristics of the materials were characterized by powder X-ray diffraction (XRD), chemical analysis, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), transmission electron microscopy (TEM), Mo ¨ssbauer spectroscopy, and magnetometry. The results unambiguously indicated that the obtained products consisted of CoFe 2 O 4 nanocrystals with good monodispersity and high stoichiometry and that, especially, a 9 nm sample exhibited room-temperature superparamagnetism. The formation mechanism of nanocrystals was proposed. It is believed that the extreme forces, to which the nucleation mixture of metallic cobalt and iron obtained with a very short time was subjected in the colloid mill, prevented aggregation of the newly formed metal nuclei. Consequently, when the resulting metal nuclei were oxidized slowly in a separate hydrothermal treatment, CoFe 2 O 4 nanocrystals with narrow size range were obtained.

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Section: Introductionmentioning

confidence: 99%

Facile Synthesis and Characterization of Cobalt Ferrite Nanocrystals via a Simple Reduction−Oxidation Route

et al. 2008

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“…The concentrations of NiO added were 0.05, 0.1 and 0.15 mol%. The employed chemicals were of analytical grade supplied by Fluka company [6,8].…”

Section: Materials and Catalyst Preparationmentioning

confidence: 99%

“…Table 1 and Fig. 1 There is no diffraction peaks of both ZnO and α-Fe 2 O 3 might suggest their entire participation in ZnFe 2 O 4 formation and/or a possible presence of some of these un-reacted oxides in a very poorly crystalline state that could not be easily detected by X-ray difractometer [6,8] …”

Section: Xrd Investigated Of Pure and Variously Doped Solidsmentioning

confidence: 99%

“…Isopropanol conversion of the investigated solids increased which might be attributed to the formation of cationic and anionic vacancies which accelerate reduction-oxidation cycles. Dehydrogenation or oxidative dehydrogenation of isopropanol has been taken as a model test for checking the catalytic potential of many catalysts [5,6]. There were three reasons for studying the catalytic dehydrogenation of isopropanol to acetone in aqueous medium; (i) to improve the water quality in terms of isopropanol contamination, (ii) testing the selectivity of the catalyst for acetone conversion and (iii) recovery of acetone as useful industrial product by fractional distillation or rotary evaporation.…”

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confidence: 99%

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Physicochemical and Catalytic Conversion of Iso-propanol over NiO-doping/nanosized ZnO-Fe2O3 system

2017

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“…The activity and selectivity of those solids could be modified by various methods such as loading on finely divided support [5,6], subjection to ionizing radiation [7] and doping with certain foreign oxides [8,9]. Furthermore, transition metals or metal oxides on support are commonly employed to catalyze several reactions including oxidation-reduction, dehydration, dehydrogenation, cracking, alkylation, etc.…”

Section: Introductionmentioning

confidence: 99%

Effects of doping with CeO2 and calcination temperature on physicochemical properties of the NiO/Al2O3 system

Shaheen¹,

El-Hendawy

2009

Open Chemistry

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Abstract:The effects of doping with CeO 2 and calcination temperature on the physicochemical properties of the NiO/Al 2 O 3 system have been investigated using DTA, XRD, nitrogen adsorption measurements at -196°C and decomposition of H 2 O 2 at 30-50°C. The pure and variously doped solids were subjected to heat treatment at 300, 400, 700, 900 and 1000°C. The results revealed that the specific surface areas increased with increasing calcination temperature from 300 to 400°C and with doping of the system with CeO 2 . The pure and variously doped solids calcined at 300 and 400°C consisted of poorly crystalline NiO dispersed on γ-Al 2 O 3. Heating at 700°C resulted in formation of well crystalline NiO and γ-Al 2 O 3 phases beside CeO 2 for the doped solids. Crystalline NiAl 2 O 4 phase was formed starting from 900°C. The degree of crystallinity of NiAl 2 O 4 increased with increasing the calcination temperature from 900 to 1000°C. An opposite effect was observed upon doping with CeO 2 . The NiO/Al 2 O 3 system calcined at 300 and 400°C has catalytic activity higher than individual NiO obtained at the same calcination temperatures. The catalytic activity of NiO/Al 2 O 3 system increased, progressively, with increasing the amount of CeO 2 dopant and decreased with increasing the calcination temperature.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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Effect of Li2O-doping of nanocrystalline CoO/Fe2O3 on isopropanol conversion

Cited by 6 publications

References 21 publications

Facile Synthesis and Characterization of Cobalt Ferrite Nanocrystals via a Simple Reduction−Oxidation Route

Facile Synthesis and Characterization of Cobalt Ferrite Nanocrystals via a Simple Reduction−Oxidation Route

Physicochemical and Catalytic Conversion of Iso-propanol over NiO-doping/nanosized ZnO-Fe2O3 system

Effects of doping with CeO2 and calcination temperature on physicochemical properties of the NiO/Al2O3 system

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