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Journal of Materials Science

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08-05-2020 | Chemical routes to materials

In situ electrical conductivity study of Pt-impregnated VO_x/γ-Al₂O₃ catalysts in propene deep oxidation

Authors: V. Bratan, P. Chesler, C. Hornoiu, M. Scurtu, G. Postole, P. Pietrzyk, A. Gervasini, A. Auroux, N. I. Ionescu

Published in: Journal of Materials Science | Issue 24/2020

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Abstract

A series of Pt-VO_x/γ-Al₂O₃ catalysts with vanadium loading corresponding to 5 and 20 wt% V₂O₅ was prepared by impregnation method. The catalytic performance of the obtained materials was investigated in propene deep oxidation reaction. The catalysts were characterized by N₂ physisorption, chemical analysis, X-ray diffraction (XRD), temperature-programmed reduction (TPR), electron paramagnetic resonance (EPR) spectroscopy, and UV–Vis diffuse reflectance spectroscopy. Alternating current (AC) electrical conductivity measurements (differential steps technique) were performed in situ during propene oxidation, using an own design reactivity cell. The variation in the measured electrical conductance brings information about the relative oxidation state of the catalyst's surface during reaction. It was found by TPR, EPR, and UV–Vis that the presence of platinum facilitates the reduction of V⁵⁺ to V⁴⁺ species. The catalytic performance of the investigated catalysts was discussed in relation to their structure, reducibility, and conductance.

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Title: In situ electrical conductivity study of Pt-impregnated VOx/γ-Al2O3 catalysts in propene deep oxidation
Authors: V. Bratan
P. Chesler
C. Hornoiu
M. Scurtu
G. Postole
P. Pietrzyk
A. Gervasini
A. Auroux
N. I. Ionescu
Publication date: 08-05-2020
Publisher: Springer US
Published in: Journal of Materials Science / Issue 24/2020
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-020-04779-0

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