Properties and catalytic performance for propane combustion of LaMnO3 prepared under microwave-assisted glycothermal conditions: Effect of solvent diols

Miniajluk, Natalia; Trawczyński, J.; Zawadzki, M.

doi:10.1016/j.apcata.2016.10.026

Cited by 37 publications

(23 citation statements)

References 50 publications

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“…An observed low-temperature peak in between 260 and 460 °C, whereas high-temperature peaks were observed between 475 and 650 °C temperature ranges. At lower temperature H 2 -consumption peak is attributed to the reduction of Co 3+ to Co 2+ and the reduction of the excess O 2 species and the chemisorbed oxygen on the surface of the catalysts, while reduction peak observed at high temperature (595 °C), is ascribed to the reduction of Co 2+ into metallic cobalt (Co 0 ), and the reduction of chemisorbed oxygen caused by lattice defects, as reported in literature 34,[51][52][53][54] . With the introduction of 5% Ce, the H 2 -consumption peaks progressively shifted towards lower temperature.…”

Section: Samples a (å) C (å) C/k Ratiosupporting

confidence: 72%

Catalytic performance of the Ce-doped LaCoO3 perovskite nanoparticles

Ansari

Adil

Alam

et al. 2020

Sci Rep

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A series of La1-xCexCoO3 perovskite nanoparticles with rhombohedral phases was synthesized via sol–gel chemical process. X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), Electron Diffraction Spectroscopy (EDS), Thermogravimetric Analysis (TGA), UV–Vis spectroscopy, Fourier Transform Infrared spectra (FTIR), Nitrogen Adsorption/desorption Isotherm, Temperature Program Reduction/Oxidation (TPR/TPO), X-ray Photoelectron Spectroscopy (XPS) techniques were utilized to examine the phase purity and chemical composition of the materials. An appropriate doping quantity of Ce ion in the LaCoO3 matrix have reduced the bond angle, thus distorting the geometrical structure and creating oxygen vacancies, which thus provides fast electron transportation. The reducibility character and surface adsorbed oxygen vacancies of the perovskites were further improved, as revealed by H2-TPR, O2-TPD and XPS studies. Furthermore, the oxidation of benzyl alcohol was investigated using the prepared perovskites to examine the effect of ceria doping on the catalytic performance of the material. The reaction was carried out with ultra-pure molecular oxygen as oxidant at atmospheric pressure in liquid medium and the kinetics of the reaction was investigated, with a focus on the conversion and selectivity towards benzaldehyde. Under optimum reaction conditions, the 5% Ce doped LaCoO3 catalyst exhibited enhanced catalytic activity (i.e., > 35%) and selectivity of > 99%, as compared to the other prepared catalysts. Remarkably, the activity of catalyst has been found to be stable after four recycles.

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Section: Samples a (å) C (å) C/k Ratiosupporting

confidence: 72%

Catalytic performance of the Ce-doped LaCoO3 perovskite nanoparticles

Ansari

Adil

Alam

et al. 2020

Sci Rep

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“…This journal is © The 89) and found that the temperatures of 10%, 50% and 90% oxidation (T 10% , T 50% and T 90% ) were higher for the perovskites than the platinum group metal (PGM). The same authors found the perovskite-like trigonal X-ray diffraction patterns.…”

Section: Paper Faraday Discussionmentioning

confidence: 99%

“…The same authors found the perovskite-like trigonal X-ray diffraction patterns. 89 Others 90 have seen primary perovskite particle sizes, shapes, aggregation and structure by high resolution TEM. The present work should be seen against this background.…”

Section: Paper Faraday Discussionmentioning

confidence: 99%

Nanoengineering ABO₃active sites from low-energy routes (TX100-stabilised water-in-oil microemulsions, surface segregation and surface complexation on colloidal AlOOH/sol–gel Al₂O₃surfaces) for pollution control catalysis

et al. 2018

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It is shown that water-in-oil microemulsions (m/e or mE) can produce BaCeO 3 (BCO) and LaCoO 3 (LCO) precursors. The nanoparticles (NPs) adsorb on AlOOH sols, in much the same way as Turkevich previously immobilised platinum group metal sols. BCO is active in CO and propane oxidation and NO removal under stoichiometric exhaust conditions, but LCO is a better oxidation catalyst. Activity was also seen when Ba,Ce and La,Co are inserted into/segregate at the surface of AlOOH/Al 2 O 3 . However, there is only formation of low levels of BCO, CAIO 3 (CAO), LCO and LaAIO 3 (LAO) perovskites, along with aluminates and separate oxides. The complexing of cations by AlOOH surface-held oxalate ions, albeit with different efficiencies, has also been explored. All three routes yield active catalysts with micro-domains of crystallinity; microemulsions produce the best defined perovskite NPs, but even those from surface segregation have higher turnover numbers than traditional Pt catalysts. Perovskite NPs may open up green chemistry for air pollution control that is consistent with a circular economy.

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“…Notably,i ns uch a monolithic catalystc onfiguration, both LMO-T and LMO are of ChemCatChem 2018ChemCatChem , 10,2184ChemCatChem -2189 www.chemcatchem.org relativelyh igher light-off temperatures but more difficultt o reach 100 %c onversion than those of powder-form LaMnO 3 catalysts reported in literature. [11] Moreover,a fter hydrothermal aging for 50 h, both nanorod and nanotube supportedP tc atalysts ( Figure 3d)r etains the catalytic conversion efficiency, demonstrating an excellent hydrothermal stability.A so ne of the advantages in nano-array configuration, the well-spaced individual nanostructures are able to preventt he pore collapse of LaMnO 3 and maintain ar obust3 Ds upport forP tn anoparticles. Besides, the interfaces formed during co-loading and calcination between LaMnO 3 and Pt may also play an important role in stabilizing the catalytic active sites.…”

mentioning

confidence: 87%

“…Compared to the LaMnO 3 control samples (LMO, LMO‐T), which showed poor low‐temperature activity, the great catalytic activity with a T 80 of 263 °C observed in 5‐T is directly derived from Pt decoration and unique nano‐array structures. Notably, in such a monolithic catalyst configuration, both LMO‐T and LMO are of relatively higher light‐off temperatures but more difficult to reach 100 % conversion than those of powder‐form LaMnO 3 catalysts reported in literature . Moreover, after hydrothermal aging for 50 h, both nanorod and nanotube supported Pt catalysts (Figure d) retains the catalytic conversion efficiency, demonstrating an excellent hydrothermal stability.…”

Section: Figurementioning

confidence: 99%

Mesoporous Perovskite Nanotube‐Array Enhanced Metallic‐State Platinum Dispersion for Low Temperature Propane Oxidation

Wang

Tang

et al. 2018

ChemCatChem

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Plagued by low surface area and limited oxidation activity at low temperature, perovskite‐type LaMnO3 based catalysts also suffer from poor hydrothermal stability. In this communication, mesoporous nanotube arrays of LaMnO3‐Pt were successfully derived from core/shell nanorod arrays with significantly increased surface area through diluted acid etching. Surface Mn4+ population is boosted to compensate La cation deficiency and enhance low temperature reducibility of nanotube arrays, enabling surface dispersion of abundant metallic‐state Pt nanoparticles. As a result, significantly enhanced catalytic propane oxidation was achieved in such a new class of perovskite/Pt nanotube array integrated structured catalysts.

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Properties and catalytic performance for propane combustion of LaMnO3 prepared under microwave-assisted glycothermal conditions: Effect of solvent diols

Cited by 37 publications

References 50 publications

Catalytic performance of the Ce-doped LaCoO3 perovskite nanoparticles

Catalytic performance of the Ce-doped LaCoO3 perovskite nanoparticles

Nanoengineering ABO₃active sites from low-energy routes (TX100-stabilised water-in-oil microemulsions, surface segregation and surface complexation on colloidal AlOOH/sol–gel Al₂O₃surfaces) for pollution control catalysis

Mesoporous Perovskite Nanotube‐Array Enhanced Metallic‐State Platinum Dispersion for Low Temperature Propane Oxidation

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Properties and catalytic performance for propane combustion of LaMnO3 prepared under microwave-assisted glycothermal conditions: Effect of solvent diols

Cited by 37 publications

References 50 publications

Catalytic performance of the Ce-doped LaCoO3 perovskite nanoparticles

Catalytic performance of the Ce-doped LaCoO3 perovskite nanoparticles

Nanoengineering ABO3active sites from low-energy routes (TX100-stabilised water-in-oil microemulsions, surface segregation and surface complexation on colloidal AlOOH/sol–gel Al2O3surfaces) for pollution control catalysis

Mesoporous Perovskite Nanotube‐Array Enhanced Metallic‐State Platinum Dispersion for Low Temperature Propane Oxidation

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Nanoengineering ABO₃active sites from low-energy routes (TX100-stabilised water-in-oil microemulsions, surface segregation and surface complexation on colloidal AlOOH/sol–gel Al₂O₃surfaces) for pollution control catalysis