Lanthanum cobalt oxide oxidation catalysts derived from mixed hydroxide precursors

Barnard, K.R.; Föger, K.; Turney, Terence W.; Williams, R.D.

doi:10.1016/0021-9517(90)90302-z

Cited by 59 publications

(9 citation statements)

References 15 publications

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“…BaZrO 3 powders in its pure crystalline form can be prepared by the precipitation in aqueous solution of high basicity [25]. LaCoO 3 was prepared by the simultaneous oxidation and coprecipitation of a mixture containing equimolar amounts of La(III) and Co(II) nitrates producing a gel containing hydroxide then calcination at 600 °C [26].…”

Section: Hydroxide-based Preparationmentioning

confidence: 99%

Perovskite Nanomaterials – Synthesis, Characterization, and Applications

Atta¹,

Galal²,

El-Ads³

2016

Perovskite Materials - Synthesis, Characterisation, Properties, and Applications

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Inorganic perovskite-type oxides are fascinating nanomaterials for wide applications in catalysis, fuel cells, and electrochemical sensing. Perovskites prepared in the nanoscale have recently received extensive attention due to their catalytic nature when used as electrode modifiers. The catalytic activity of these oxides is higher than that of many transition metals compounds and even some precious metal oxides. They exhibit attractive physical and chemical characteristics such as electronic conductivity, electrically active structure, the oxide ions mobility through the crystal lattice, variations on the content of the oxygen, thermal and chemical stability, and supermagnetic, photocatalytic, thermoelectric, and dielectric properties.Nanoperovskites have been utilized as catalysts in oxygen reduction and hydrogen evolution reactions exhibiting high electrocatalytic activity, lower activation energy, and high electron transfer kinetics. In addition, some perovskites are promising candidates for the development of effective anodic catalysts for direct fuel cells showing high catalytic performance. Moreover, they are recently utilized in electrochemical sensing of alcohols, gases, glucose, H 2 O 2 , and neurotransmitters. They can enhance the catalytic performance in terms of selectivity, sensitivity, unique long-term stability, excellent reproducibility, and anti-interference ability. In addition, organometallic halide perovskites exhibited efficient intrinsic properties for photovoltaic solar cells exhibiting good stability and high efficiency.This chapter introduces a comprehensive coverage of the progress in perovskites research and their applications. Emphasis is given toward several intrinsic properties of perovskites, namely, electronic conductivity, electrically active structure, and electrochemical performance in terms of synthesis routes and stability. The different synthesis methods of the perovskites (coprecipitation, sol-gel, microwave, citrate/ nitrate, etc.) will be summarized in this chapter. The synthesis method affected

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Section: Hydroxide-based Preparationmentioning

confidence: 99%

Perovskite Nanomaterials – Synthesis, Characterization, and Applications

Atta¹,

Galal²,

El-Ads³

2016

Perovskite Materials - Synthesis, Characterisation, Properties, and Applications

View full text Add to dashboard Cite

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“…Because of the participation of surface oxygen atoms in the mechanism, numerous studies focused on the development of new synthesis routes in order to enhance the specific surface area. Barnard et al prepared LaCoO3 by calcination of mixed hydroxide precursors and reported that the rate for CO oxidation exhibited a linear dependence with the surface area [85]. Shu et al developed a complexation technique with additional introduction of zinc nitrate to synthesize cobaltite.…”

Section: Perovskite Catalystsmentioning

confidence: 99%

Transition metal oxides for combustion and depollution processes

Bion¹,

Can²,

Courtois³

et al. 2018

Metal Oxides in Heterogeneous Catalysis

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Transition metal oxides (M = Mn, Co, Fe, Ni,…) are potential catalysts for application in combustion and depollution processes. Owing to huge improvements in their preparation, perovskites, spinels, hexaaaluminates and some other oxide structures can replace noble metals in a number of processes. In this chapter, the most recent advances in the use of oxides for total oxidation (CO, methane, COV, wet air oxidation) and for the treatment of nitrogen compounds (NOx, NH3, urea) will be reviewed. In every case, the most probable mechanism (Langmuir-Hinshelwood, Eley-Rideal, Mars-van Krevelen,…) and the nature of active sites (M n+ /M n+1 ion pairs, acid-base sites,…) as well as the role of reactive oxygen species will be examined in the light of recent results and up-to-date concepts. Finally the outstanding progresses in the oxide synthesis allow to apply these concepts to the development of extremely active and more stable catalysts.

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“…Over the last two decades, there has been much effort in the field of preparation and characterization of colloidal nanoparticles − in the context of material science and heterogeneous catalysis. − The widespread research in this field can be found in the articles of Pillai et al and Nagy et al Synthesized nanoscopic materials are known to display optical, magnetic, and structural properties that are absent (or cannot be measured) in bulk materials. − …”

Section: Introductionmentioning

confidence: 99%

Dispersed Molecular Aggregates. 3. Synthesis and Characterization of Colloidal Lead Chromate in Water/Sodium Bis(2-ethylhexyl)sulfosuccinate/n-Heptane Water-in-Oil Microemulsion Medium

et al. 2001

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A nanocolloidal dispersion of lead chromate (PbCrO4) has been prepared in H2O/sodium bis(2-ethylhexyl)sulfosuccinate (AOT)/n-heptane water-in-oil (w/o) microemulsion medium. The formation of the PbCrO4 in the water pool of the microemulsion has been established by Fourier transform infrared measurements. The absorbance and fluorescence behaviors of the colloidal PbCrO4 have been investigated with varying water pool size, i.e., varying [water]/[AOT] mole ratio, ω. The dimension of the lead chromate encapsulated microemulsion droplets has also been determined by the dynamic light scattering method under varied ω. The dimension and shape of the colloidal dispersions in microemulsion have been examined by transmission and scanning electron microscopic measurements.

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Lanthanum cobalt oxide oxidation catalysts derived from mixed hydroxide precursors

Cited by 59 publications

References 15 publications

Perovskite Nanomaterials – Synthesis, Characterization, and Applications

Perovskite Nanomaterials – Synthesis, Characterization, and Applications

Transition metal oxides for combustion and depollution processes

Dispersed Molecular Aggregates. 3. Synthesis and Characterization of Colloidal Lead Chromate in Water/Sodium Bis(2-ethylhexyl)sulfosuccinate/n-Heptane Water-in-Oil Microemulsion Medium

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