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Open AccessArticle

Promoting Li/MgO Catalyst with Molybdenum Oxide for Oxidative Conversion of n-Hexane

1
Baha & Walid Bassatne Department of Chemical Engineering and Advanced Energy, Maroun Semaan Faculty of Engineering and Architecture, American University of Beirut, Beirut 1107 2020, Lebanon
2
Catalytic Processes and Materials, Mesa+ Institute for Nanotechnology, Faculty of Science and Technology, University of Twente, 7522 NB Enschede, The Netherlands
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(3), 354; https://doi.org/10.3390/catal10030354
Received: 25 February 2020 / Accepted: 4 March 2020 / Published: 23 March 2020
In this work, molybdena-promoted Li/MgO is studied as a catalyst for the oxidative conversion of n-hexane. The structure of the catalysts is investigated with X-ray Diffraction (XRD) and Raman spectroscopy. The MoO3/Li/MgO catalyst contains three types of molybdena-containing species, the presence of which depend on molybdena loading. At low Mo/Li ratios (i) isolated dispersed [MoO4]2− anionic species are observed. At high Mo/Li ratios, the formation of crystalline lithium molybdate phases such as (ii) monomeric Li2MoO4 and tentatively (iii) polymeric Li2Mo4O13 are concluded. The presence of these lithium molybdates diminishes the formation of Li2CO3 in the catalyst. Subsequently, the catalyst maintains high surface area and stability with time-on-stream during oxidative conversion. Molybdena loading as low as 0.5 wt % is sufficient to induce these improvements, maintaining the non-redox characteristics of the catalyst, whereas higher loadings enhance deep oxidation and oxidative dehydrogenation reactions. Promoting a Li/MgO catalyst with 0.5 wt % MoO3 is thus efficient for selective conversion of n-hexane to alkenes, giving alkene yield up to 24% as well as good stability. View Full-Text
Keywords: Li/MgO; molybdenum oxide; oxidative dehydrogenation; oxidative cracking; n-hexane; Raman Li/MgO; molybdenum oxide; oxidative dehydrogenation; oxidative cracking; n-hexane; Raman
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MDPI and ACS Style

Boyadjian, C.; Lefferts, L. Promoting Li/MgO Catalyst with Molybdenum Oxide for Oxidative Conversion of n-Hexane. Catalysts 2020, 10, 354.

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