The catalytic performances of α-MnO2 and δ-MnO2 catalysts synthesized from KMnO4 and ethanol for total oxidation of isopropanol

Tuan Nguyen; Nga Phan

doi:10.51316/jca.2020.009

Authors

Nguyen Dinh Minh Tuan The University of Danang Author
Phan Thi Hang Nga The University of Danang Author

DOI:

https://doi.org/10.51316/jca.2020.009

Keywords:

α-MnO2, cryptomelane, VOCs, isopropanol

Abstract

In this study, the catalytic activities of total oxidation of isopropanol (IPA) over MnO₂-based catalysts (α-MnO₂ and δ-MnO₂) were studied and compared. These catalysts were synthesized by an oxidation/reduction route between ethanol and KMnO₄ by using dropwise method. Their morphological, structural properties, specific surface area, pore distribution and reducibility were characterized by SEM, XRD, FTIR, N₂ isothermal adsorption-desorption, and hydrogen temperature-programmed reduction (H₂-TPR). As a result, IPA was significantly oxidized to acetone at low temperature (<130 °C) and subsequently to CO₂ at higher temperature. α-MnO₂ was demonstrated as a better catalyst for total oxidation of IPA compared with δ-MnO₂. Over 205 °C, IPA was completely oxidized to CO₂. Additionally, the high reducibility of δ-MnO₂ was found to be correlated with higher activity of IPA toward acetone at low temperature.

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