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Synthesis of oxide supported LaMnO3 perovskites to enhance yields in toluene combustion

Paper ID Volume ID Publish Year Pages File Format Full-Text
45217 46407 2016 9 PDF Available
Title
Synthesis of oxide supported LaMnO3 perovskites to enhance yields in toluene combustion
Abstract

•LaMnO3 supported catalysts were prepared by one-pot synthesis adapted from citrate sol-gel method.•LaMnO3 supported catalysts are very efficient and stable for toluene oxidation.•With LaMnO3/YSZ a greater dispersion of perovskite is obtained.•With LaMnO3/TiO2 a synergistic effect is observed.

Perovskite-type oxides of LaMnO3 were synthesized by citrate sol-gel method in the presence of an oxide support. The physicochemical properties of the LaMnO3 supported materials were characterized by inductively coupled plasma atomic emission spectroscopy (ICP-AES), thermogravimetric and differential thermal analysis (TGA/DTA), N2 adsorption–desorption, X-ray diffraction (XRD), high transmission electron microscopy (HRTEM-EDX) and oxygen isotopic exchange analysis. Their catalytic performances, especially those related to the catalyst stability, were evaluated for the total oxidation of toluene. To this aim, three consecutive catalytic cycles were performed for each catalyst. The LaMnO3 perovskite phase appeared to interact with TiO2 and Y2O3–ZrO2 (YSZ) supports in a manner that affected both oxygen mobility and catalytic activity in total toluene oxidation. The isotopic exchange results matched well the catalytic tests. Indeed, the supported materials showed a remarkable oxygen exchange activity and higher catalytic performances than that of pure perovskite. For YSZ, this could be attributed to the influence of oxygen vacancies and oxygen ions on the support. Regarding TiO2, this improvement could be attributed to the reducibility properties of titania (TiIV/TiIII). Strong metal-support interactions (SMSI) between the perovskite and the support were observed.

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Keywords
Environmental chemistry; Gas-phase reactions; Heterogeneous catalysis; Perovskite phases; Toluene oxidation; Oxygen isotopic exchange
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Synthesis of oxide supported LaMnO3 perovskites to enhance yields in toluene combustion
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 180, January 2016, Pages 29–37
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us