Synthesis, X-ray, infrared spectra and electrical conductivity of La/Ba–CoO3 systems

Khalil, M. Sh.

doi:10.1016/s0921-5093(02)00557-9

Cited by 40 publications

(19 citation statements)

References 8 publications

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“…The absorption band at 586 and 594 cm -1 in Fig. 5 related to Co-O stretching vibration, which was confirmed with the reported value that cobalt-oxygen stretching appears at around 600 cm -1 (Khalil 2003).…”

Section: Xrd Analysis Of the Catalystssupporting

confidence: 89%

Development of highly efficient double-substituted perovskite catalysts for abatement of diesel soot emissions

Mishra

Прасад

2015

Clean Techn Environ Policy

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Strontium-substituted LaCoO 3 and doublesubstituted La 0.9 Sr 0.1 CoO 3 by Cu, Fe and Ni perovskite catalysts were prepared via citric acid sol-gel method. The precursors were calcined at 750°C in stagnant air. The precursor of the catalyst showing the best activity for soot oxidation was also reactively calcined in a flowing reactive mixture of 4.6 % CO in air at 750°C. The catalysts were characterized by N 2 -sorption, XRD, FTIR and SEM. The substitution of Sr in LaCoO 3 enhanced the activity of the catalyst. Further, increase in the activities of the catalysts was observed for double substitution of Cu, Ni and Fe in La 0.9 Sr 0.1 CoO 3 . The catalyst formulation La 0.9 Sr 0.1 Co 0.5-Fe 0.5 O 3 , calcined in air (Cat-5A) and reactively calcined (Cat-5B), showed higher activities than other four optimized catalysts composition calcined in air. Cat-5B exhibited the best activity resulting in total soot combustion at the lowest temperature of 325°C. The best performance of Cat-5B was associated with its partially reduced perovskite phase as a result of reactive calcination leading to lattice vacancies and defects. Cat-5B has good thermal stability found in a repeated cycles of soot combustion experiments.

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Section: Xrd Analysis Of the Catalystssupporting

confidence: 89%

Development of highly efficient double-substituted perovskite catalysts for abatement of diesel soot emissions

Mishra

Прасад

2015

Clean Techn Environ Policy

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“…The absorption band at 1480cm -1 was corresponded to nitrate ion. In addition, the band at 1096 cm -1 was corresponded to Co-OH bending which is confirmed with the reported value that MOH bending mode appears below 1200 cm -1 [38].The absorption band at 583 cm -1 in figure 3 related to Co-O stretching vibration, which was confirmed with the reported value that cobalt-oxygen stretching appears at around 600 cm -1 [39]. figure 6 revealed that the prepared catalyst samples were highly porous and aggregated.…”

Section: Effect Of Calcination Temperature On Lacoo 3 Prepared By Co-supporting

confidence: 86%

Effect of Preparation Method and Calcination Temperature on LaCoO3 Perovskite Catalyst for Diesel Soot Oxidation

Mishra¹,

Прасад

2015

Can Chem Trans

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Abstract:The present work attempts to scan the effect of preparation methods (co-precipitation, sol-gel and solution combustion synthesis) and calcination temperature (600-800 o C) on the efficiency of LaCoO 3 catalysts for soot oxidation. All the catalysts were highly selective towards CO 2 as no CO was detected in the flue gas. Catalyst produced following co-precipitation method revealed total soot oxidation at the lowest temperature (T f = 370 o C) than other two catalysts prepared by sol-gel (T f = 420 o C) and solution combustion synthesis (T f = 456 o C) methods. Irrespective of the preparation methods, 750 o C was the optimum calcination temperature of the precursors resulting LaCoO 3 catalysts which exhibited maximum activity for soot oxidation. In addition, the results showed that the specific surface areas of the catalysts decreased with increasing calcination temperature beyond 750 o C and consequently decreasing the activity of the catalyst.

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“…This point of view is supported by recent cold inelastic neutron scattering studies, and it is conformed that the clusters increase in size and number with increasing concentration of x [26]. Ba 2+ doping has a similar effect of introducing holes into Co-O bonds as Sr 2+ doping, except that Ba 2+ ion has larger ionic radius than Sr 2+ ion [20][21][22][23][24]. Therefore, it is reasonable to believe that the phase-separated picture of La 1Àx Sr x CoO 3 described above is also true for the system of LBCO.…”

Section: Magnetizationsupporting

confidence: 55%

“…Ba 2+ has larger ionic radius [20] and it can introduce holes into Co-O bonds as Sr 2+ or Ca 2+ does. Unfortunately, however, there are only a few studies [21][22][23][24] about La 1Àx Ba x CoO 3 and most of them are focused on the transport properties. In the present work, the magnetic properties of La 1Àx Ba x CoO 3 (0.0oxo0.18) are investigated in detail.…”

Section: Introductionmentioning

confidence: 99%

Superparamagnetic properties of La1−xBaxCoO3 (0.0<x<0.18)

Luo

Wang

2009

Journal of Magnetism and Magnetic Materials

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Synthesis, X-ray, infrared spectra and electrical conductivity of La/Ba–CoO3 systems

Cited by 40 publications

References 8 publications

Development of highly efficient double-substituted perovskite catalysts for abatement of diesel soot emissions

Development of highly efficient double-substituted perovskite catalysts for abatement of diesel soot emissions

Effect of Preparation Method and Calcination Temperature on LaCoO3 Perovskite Catalyst for Diesel Soot Oxidation

Superparamagnetic properties of La1−xBaxCoO3 (0.0<x<0.18)

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