The effect of preparation: Pechini and Schiff base methods, on adsorbed oxygen of LaCoO3 perovskite oxidation catalysts

Worayingyong, Attera; Kangvansura, Praewpilin; Ausadasuk, Siritha; Praserthdam, Piyasan

doi:10.1016/j.colsurfa.2007.08.002

Cited by 76 publications

(38 citation statements)

References 26 publications

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“…The temperature of the solution was increased to 90°C, and the mixture was stirred continuously for 2 h. Subsequently, the temperature was increased to 150°C, and the mixture was heated for 4-5 h, until a black powder was obtained. The resulting powder, which was the perovskite precursor, was pulverized and then calcined at 700°C for 2 h. Following calcination, the perovskite powder was again pulverized [20][21][22][23][24].…”

Section: Methodsmentioning

confidence: 99%

Preparation and characterization of electrospun LaCoO3 fibers for oxygen reduction and evolution in rechargeable Zn–air batteries

et al. 2015

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LaCoO 3 fibers were synthesized through the calcination of an electrospun polymer-metal precursor fiber. The electrochemical performance of these fibers for oxygen reduction and evolution reactions was characterized in a KOH solution. Additionally, the electrochemical properties were compared with those of a conventional PtRu/C catalyst and a LaCoO 3 powder, which was synthesized using the Pechini method. The LaCoO 3 fibers had a greater surface area compared with the powder, whereas the crystal structures of the fibers and powder were notably similar. The LaCoO 3 fibers demonstrated better electrochemical properties compared with the LaCoO 3 powder, which was attributed to the increased surface area and number of active sites in the fibers.

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Section: Methodsmentioning

confidence: 99%

Preparation and characterization of electrospun LaCoO3 fibers for oxygen reduction and evolution in rechargeable Zn–air batteries

et al. 2015

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“…17,18) Owing to the existence of a small amount of Co 2þ , there also may be some oxygen vacancy on the LaCoO 3Àx surface. 19) Besides, the broad peak in the range of 785.6-788.2 eV is the Co 2þ satellite peak. 17,18,20) This indicates that Co 2þ exists in a significant part in the surface region and the original (i.e., before the application) Co 3þ can be reduced to Co 2þ gradually especially by the excitation from outside.…”

Section: Xps Analysismentioning

confidence: 99%

Dye Degradation Activity and Stability of Perovskite-Type LaCoO3−x (x=0&sim;0.075)

Sun

Jiang

et al. 2010

Mater. Trans.

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Perovskite-type LaCoO 3Àx (x ¼ 0$0:075) porous powder was synthesized via citrate sol-gel method. With calcination temperature increasing, its crystal structure changed from LaCoO 3 to LaCoO 2:925 with the increase in oxygen vacancy. The synthesized LaCoO 3Àx contains a large amount of adsorbed oxygen on its surface due to the existence of oxygen vacancy to some extent. Dye degradation activity of LaCoO 3Àx in methyl orange solution was investigated both under the visible light irradiation (>400 nm) and in the dark. LaCoO 3Àx exhibited dye degradation activity in the dark when being preserved in methyl orange solution for a long time caused by the reducibility of Co 3þ in LaCoO 3Àx , and then dye molecule was oxidized gradually and slowly. The degradation rate was improved under the visible light due to the optical property of LaCoO 3Àx in visible light region. After degradation, methyl orange molecule may be decomposed to acetate group in a small amount. After use for a long time, some Co 3þ was reduced to Co 2þ accompanied by the formation of oxygen vacancy, and then LaCoO 3 transformed to LaCoO 2:925 gradually. For LaCoO 3Àx calcined at 800 C, LaCoO 3Àx perovskite skeleton structure was stable, and can be reused in recycle dye degradation.

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“…According to some authors, perovskites used as catalysts were activated and its stability was reached rapidly, presenting a complete conversion of CO in the temperature range from 220 °C to 355 °C. Other perovskites such as LaNi (1−x) Co x O 3−δ , synthesized by the discontinuous precipitation method, have also been tested as catalysts on the conversion of methane to syngas by CO 2 reforming [13]. Perovskites with the composition LaNi 0.3 Co 0.7 O 3-δ have shown to be more active and also resistant to deactivation after 10 h of reaction.…”

Section: Introductionmentioning

confidence: 99%

“…This fact is attributed to the capacity of this simple structure to accommodate a wide variety of ions with different valences and it can be easily synthesized due to its chemical structure flexibility [10,11], indicating the importance of this type of perovskite oxide. However, only a small fraction of materials presenting perovskite structure has been explored in the catalysis field at low temperature [12][13][14], although a catalyst is actually used in the majority of the chemical and petrochemical industrial processes. Some perovskites with different compositions were tested as catalysts by Doggali et al [15] and Seyfi et al [16] on carbon monoxide oxidation.…”

Section: Introductionmentioning

confidence: 99%

LaNi0.3Co0.7O3-δ and SrFe0.2Co0.8O3-δ Ceramic Materials: Structural and Catalytic Reactivity under CO Stream

et al. 2014

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Abstract:In this study, we presented the synthesis of LaNi 0.3 Co 0.7 O 3−δ (LNCO) and SrCo 0.8 Fe 0.2 O 3−δ (SFCO) perovskites and their catalytic reactivity under CO gas flow. The synthesis method is based on the complexation method combining ethylenediaminetetraacetic acid (EDTA)-citrate. The as-prepared materials were characterized using X-ray diffraction/Rietveld refinement and electron microscopy. The diffractograms and Rietveld refinement showed that the EDTA-citrate method allows us to obtain monophasic powders with submicronic size. The structural analyses revealed different morphologies linked to the crystallinity of LNCO and SFCO, and to the mean crystallite size. The catalytic performances of LNCO and SFCO were studied in situ by Fourier Transform InfraRed spectrometer as a function of time and temperature. The catalytic process gave rise to total oxidation with carbon dioxide and water production. LNCO and SFCO exhibit the same profile for catalytic activity with a conversion rate of twice as high for LNCO. Below 150 °C, the kinetic conversion is slow, but beyond this temperature they reach rapidly the complete transformation at 250 °C and 275 °C for LNCO and SFCO, respectively. OPEN ACCESSCatalysts 2014, 4 78

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The effect of preparation: Pechini and Schiff base methods, on adsorbed oxygen of LaCoO3 perovskite oxidation catalysts

Cited by 76 publications

References 26 publications

Preparation and characterization of electrospun LaCoO3 fibers for oxygen reduction and evolution in rechargeable Zn–air batteries

Preparation and characterization of electrospun LaCoO3 fibers for oxygen reduction and evolution in rechargeable Zn–air batteries

Dye Degradation Activity and Stability of Perovskite-Type LaCoO<SUB>3−<I>x</I></SUB> (<I>x</I>=0&sim;0.075)

LaNi0.3Co0.7O3-δ and SrFe0.2Co0.8O3-δ Ceramic Materials: Structural and Catalytic Reactivity under CO Stream

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The effect of preparation: Pechini and Schiff base methods, on adsorbed oxygen of LaCoO3 perovskite oxidation catalysts

Cited by 76 publications

References 26 publications

Preparation and characterization of electrospun LaCoO3 fibers for oxygen reduction and evolution in rechargeable Zn–air batteries

Preparation and characterization of electrospun LaCoO3 fibers for oxygen reduction and evolution in rechargeable Zn–air batteries

Dye Degradation Activity and Stability of Perovskite-Type LaCoO<SUB>3&minus;<I>x</I></SUB> (<I>x</I>=0&sim;0.075)

LaNi0.3Co0.7O3-δ and SrFe0.2Co0.8O3-δ Ceramic Materials: Structural and Catalytic Reactivity under CO Stream

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Dye Degradation Activity and Stability of Perovskite-Type LaCoO<SUB>3−<I>x</I></SUB> (<I>x</I>=0&sim;0.075)