Mechanochemically Prepared Co3O4-CeO2 Catalysts for Complete Benzene Oxidation

Considerable efforts to reduce the harmful emissions of volatile organic compounds (VOCs) have been directed towards the development of highly active and economically viable catalytic materials for complete hydrocarbon oxidation. The present study is focused on the complete benzene oxidation as a pr...

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Autores principales:	Lyuba Ilieva, Petya Petrova, Anna Maria Venezia, Elena Maria Anghel, Razvan State, Georgi Avdeev, Tatyana Tabakova
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> mixed oxides mechanochemical preparation complete benzene oxidation Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/ac3cb4eda893460fa916619d043bfd71
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spelling	oai:doaj.org-article:ac3cb4eda893460fa916619d043bfd712021-11-25T17:05:46ZMechanochemically Prepared Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> Catalysts for Complete Benzene Oxidation10.3390/catal111113162073-4344https://doaj.org/article/ac3cb4eda893460fa916619d043bfd712021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1316https://doaj.org/toc/2073-4344Considerable efforts to reduce the harmful emissions of volatile organic compounds (VOCs) have been directed towards the development of highly active and economically viable catalytic materials for complete hydrocarbon oxidation. The present study is focused on the complete benzene oxidation as a probe reaction for VOCs abatement over Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> mixed oxides (20, 30, and 40 wt.% of ceria) synthesized by the more sustainable, in terms of less waste, less energy and less hazard, mechanochemical mixing of cerium hydroxide and cobalt hydroxycarbonate precursors. The catalysts were characterized by BET, powder XRD, H<sub>2</sub>-TPR, UV resonance Raman spectroscopy, and XPS techniques. The mixed oxides exhibited superior catalytic activity in comparison with Co<sub>3</sub>O<sub>4</sub>, thus, confirming the promotional role of ceria. The close interaction between Co<sub>3</sub>O<sub>4</sub> and CeO<sub>2</sub> phases, induced by mechanochemical treatment, led to strained Co<sub>3</sub>O<sub>4</sub> and CeO<sub>2</sub> surface structures. The most significant surface defectiveness was attained for 70 wt.% Co<sub>3</sub>O<sub>4</sub>-30 wt.% CeO<sub>2</sub>. A trend of the highest surface amount of Co<sup>3+</sup>, Ce<sup>3+</sup> and adsorbed oxygen species was evidenced for the sample with this optimal composition. The catalyst exhibited the best performance and 100% benzene conversion was reached at 200 °C (relatively low temperature for noble metal-free oxide catalysts). The catalytic activity at 200 °C was stable without any products of incomplete benzene oxidation. The results showed promising catalytic properties for effective VOCs elimination over low-cost Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> mixed oxides synthesized by simple and eco-friendly mechanochemical mixing.Lyuba IlievaPetya PetrovaAnna Maria VeneziaElena Maria AnghelRazvan StateGeorgi AvdeevTatyana TabakovaMDPI AGarticleCo<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> mixed oxidesmechanochemical preparationcomplete benzene oxidationChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1316, p 1316 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> mixed oxides mechanochemical preparation complete benzene oxidation Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> mixed oxides mechanochemical preparation complete benzene oxidation Chemical technology TP1-1185 Chemistry QD1-999 Lyuba Ilieva Petya Petrova Anna Maria Venezia Elena Maria Anghel Razvan State Georgi Avdeev Tatyana Tabakova Mechanochemically Prepared Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> Catalysts for Complete Benzene Oxidation
description	Considerable efforts to reduce the harmful emissions of volatile organic compounds (VOCs) have been directed towards the development of highly active and economically viable catalytic materials for complete hydrocarbon oxidation. The present study is focused on the complete benzene oxidation as a probe reaction for VOCs abatement over Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> mixed oxides (20, 30, and 40 wt.% of ceria) synthesized by the more sustainable, in terms of less waste, less energy and less hazard, mechanochemical mixing of cerium hydroxide and cobalt hydroxycarbonate precursors. The catalysts were characterized by BET, powder XRD, H<sub>2</sub>-TPR, UV resonance Raman spectroscopy, and XPS techniques. The mixed oxides exhibited superior catalytic activity in comparison with Co<sub>3</sub>O<sub>4</sub>, thus, confirming the promotional role of ceria. The close interaction between Co<sub>3</sub>O<sub>4</sub> and CeO<sub>2</sub> phases, induced by mechanochemical treatment, led to strained Co<sub>3</sub>O<sub>4</sub> and CeO<sub>2</sub> surface structures. The most significant surface defectiveness was attained for 70 wt.% Co<sub>3</sub>O<sub>4</sub>-30 wt.% CeO<sub>2</sub>. A trend of the highest surface amount of Co<sup>3+</sup>, Ce<sup>3+</sup> and adsorbed oxygen species was evidenced for the sample with this optimal composition. The catalyst exhibited the best performance and 100% benzene conversion was reached at 200 °C (relatively low temperature for noble metal-free oxide catalysts). The catalytic activity at 200 °C was stable without any products of incomplete benzene oxidation. The results showed promising catalytic properties for effective VOCs elimination over low-cost Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> mixed oxides synthesized by simple and eco-friendly mechanochemical mixing.
format	article
author	Lyuba Ilieva Petya Petrova Anna Maria Venezia Elena Maria Anghel Razvan State Georgi Avdeev Tatyana Tabakova
author_facet	Lyuba Ilieva Petya Petrova Anna Maria Venezia Elena Maria Anghel Razvan State Georgi Avdeev Tatyana Tabakova
author_sort	Lyuba Ilieva
title	Mechanochemically Prepared Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> Catalysts for Complete Benzene Oxidation
title_short	Mechanochemically Prepared Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> Catalysts for Complete Benzene Oxidation
title_full	Mechanochemically Prepared Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> Catalysts for Complete Benzene Oxidation
title_fullStr	Mechanochemically Prepared Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> Catalysts for Complete Benzene Oxidation
title_full_unstemmed	Mechanochemically Prepared Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> Catalysts for Complete Benzene Oxidation
title_sort	mechanochemically prepared co<sub>3</sub>o<sub>4</sub>-ceo<sub>2</sub> catalysts for complete benzene oxidation
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/ac3cb4eda893460fa916619d043bfd71
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Mechanochemically Prepared Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> Catalysts for Complete Benzene Oxidation

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