Microwave synthesis of nanocrystalline LaCoO3 samples and their catalytic activity towards decomposition of isopropanol

Mohamed, Reham A.; Girgis, M.M.; El-Awad, A.M.; Gabr, R.M.

doi:10.1007/s11144-020-01733-8

Cited by 8 publications

(2 citation statements)

References 69 publications

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“…The difference on the ionic radius between the metals was responsible of an alteration of the crystal structure [23]. It should be noted that no peaks characteristics of the NiO and Co3O4 were observed, indicating that the main phase after calcination at 650 ºC was perovskite, in agreement with other authors [13,33].…”

Section: Laco1-xnixo3 Perovskites As Catalysts Influence Of Ni/co Ratiosupporting

confidence: 89%

Self-combustion Ni and Co-based perovskites as catalyst precursors for ammonia decomposition. Effect of Ce and Mg doping

Pinzón

Sánchez-Sánchez

Romero

et al. 2022

Fuel

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Section: Laco1-xnixo3 Perovskites As Catalysts Influence Of Ni/co Ratiosupporting

confidence: 89%

Self-combustion Ni and Co-based perovskites as catalyst precursors for ammonia decomposition. Effect of Ce and Mg doping

Pinzón

Sánchez-Sánchez

Romero

et al. 2022

Fuel

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“…Others linked nonoxidative dehydrogenation of IPA to the exposed (111) facets of Cu catalyst 66 based on the calculated values of the energy barrier for the dehydrogenation process, or in the case of the photocatalytic dehydrogenation of IPA, due to the formation of highly defect (001) faceted–ZnO 67 that facilitate the adsorption of IPA during its dehydrogenation to acetone. Another research team 68 postulated that there was a strong correlation between the selectivity of dehydrogenation of IPA and the redox couple species evaluated on LaCoO 3 catalyst. To support their proposed mechanism, Lin et al 69 employed density functional theory (DFT) to calculate the activation barrier of dehydrogenation and dehydration reactions of IPA over WO x /Pt (111) surfaces.…”

Section: Resultsmentioning

confidence: 99%

Highly basic and active ZnO–x% K₂O nanocomposite catalysts for the production of methyl ethyl ketone biofuel

Halawy

Osman

Rooney

2022

Energy Science & Engineering

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Herein we demonstrate the preparation and characterization of nanocrystalline ZnO, either pure or promoted with 1–10 wt.% K2O. All catalysts calcined at 400°C were in the nano‐crystallite scale as confirmed by X‐ray powder diffraction analysis in the 22.9–28.0 nm range. According to the CO2‐temperature‐programmed desorption study using thermogravimetric analysis and differential scanning calorimetry techniques, they have a broad spectrum of surface basic sites. Because of the significance of methyl ethyl ketone (MEK) as a next‐generation biofuel candidate with high‐octane, low boiling point, and relatively high vapor pressure. The prepared catalysts were examined during the direct production of MEK via 2‐butanol (2B) dehydrogenation. Among catalysts tested, ZnO promoted with 1% K2O showed a superior catalytic activity towards the conversion of 2B to MEK, that is, 71.7% at a reaction temperature of 275°C. The selectivity for the production of MEK over all catalysts was ≥95% across all catalysts when using N2‐gas as a carrier. The use of airflow in this reaction resulted in a clear loss of selectivity toward MEK production as well as the appearance of undesirable products such as acetone and methanol. All catalytic properties of catalysts, particularly those of moderate strength, were highly correlated with the distribution of surface basic sites. Finally, a reaction mechanism was proposed for the dehydrogenation of 2B, followed by the partial oxidation of MEK.

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Flexible Ni‐Based Bimetallic Spinel Oxide (NiM₂O₄, M = Mn, Fe, Co) Electrodes for Supercapacitor Applications

Maneesard,

Somsongkul,

Chirawatkul

et al. 2024

Physica Status Solidi (a)

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Herein, the single‐phase Ni‐based bimetallic spinel oxide (NiM2O4, M = Mn, Fe, Co) nanoparticles are successfully synthesized by sol–gel method and coated on a carbon cloth substrate to form flexible electrodes for supercapacitor applications. The effects of transition metal activity, calcination temperature, surface, and textural properties on the electrochemical properties of spinel electrode materials are demonstrated. It is found that lowering the calcination temperature results in a decrease in crystallite size and particle size, leading to an increase in surface area and pore volume. X‐Ray absorption spectroscopy reveals the presence of Mn2+/3+, Fe2+/3+, and Co2+/3+ in materials. According to the electrochemical studies, NiMn2O4 electrode in Na2SO4 electrolyte exhibits electrical double‐layer capacitance behavior, while NiFe2O4 and NiCo2O4 electrodes in KOH electrolyte exhibit pseudocapacitive behavior. All electrode materials have low solution resistance and charge transfer resistance. NiCo2O4 provides the highest specific capacitance (85.60 F g−1 at 2.5 A g−1) followed by NiFe2O4 and NiMn2O4. It seems likely that the high electrochemical activity of Co2+/3+ and small particle size of NiCo2O4 nanoparticles play an important role in improving the redox process and charge transfer, which may enhance the electrochemical performance of this electrode material.

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Microwave synthesis of nanocrystalline LaCoO3 samples and their catalytic activity towards decomposition of isopropanol

Cited by 8 publications

References 69 publications

Self-combustion Ni and Co-based perovskites as catalyst precursors for ammonia decomposition. Effect of Ce and Mg doping

Self-combustion Ni and Co-based perovskites as catalyst precursors for ammonia decomposition. Effect of Ce and Mg doping

Highly basic and active ZnO–x% K₂O nanocomposite catalysts for the production of methyl ethyl ketone biofuel

Flexible Ni‐Based Bimetallic Spinel Oxide (NiM₂O₄, M = Mn, Fe, Co) Electrodes for Supercapacitor Applications

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Microwave synthesis of nanocrystalline LaCoO3 samples and their catalytic activity towards decomposition of isopropanol

Cited by 8 publications

References 69 publications

Self-combustion Ni and Co-based perovskites as catalyst precursors for ammonia decomposition. Effect of Ce and Mg doping

Self-combustion Ni and Co-based perovskites as catalyst precursors for ammonia decomposition. Effect of Ce and Mg doping

Highly basic and active ZnO–x% K2O nanocomposite catalysts for the production of methyl ethyl ketone biofuel

Flexible Ni‐Based Bimetallic Spinel Oxide (NiM2O4, M = Mn, Fe, Co) Electrodes for Supercapacitor Applications

Contact Info

Product

Resources

About

Highly basic and active ZnO–x% K₂O nanocomposite catalysts for the production of methyl ethyl ketone biofuel

Flexible Ni‐Based Bimetallic Spinel Oxide (NiM₂O₄, M = Mn, Fe, Co) Electrodes for Supercapacitor Applications