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Materials 2019, 12(6), 884; https://doi.org/10.3390/ma12060884

Structured Monolithic Catalysts vs. Fixed Bed for the Oxidative Dehydrogenation of Propane

1
Chemical Plants and Industrial Chemistry Group, Dipartimento di Chimica, Università degli Studi di Milano, CNR-ISTM, INSTM Unit Milano Università, via C. Golgi 19, 20133 Milano, Italy
2
DICCA, Università degli Studi di Genova, and INSTM unit Genova, via all’Opera Pia 15A, 16100 Genoa, Italy
*
Author to whom correspondence should be addressed.
Received: 20 February 2019 / Revised: 12 March 2019 / Accepted: 14 March 2019 / Published: 16 March 2019
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Abstract

The deposition of V-based catalysts for the oxidative dehydrogenation of propane to propene on cordierite honeycomb monoliths was optimised as a strategy to decrease the contact time in a structured reactor with respect to a conventional fixed bed one. 10 wt% VOx supported over SiO2 or Al2O3 were used as catalysts, deposed over the monolith using silica or alumina as primer, respectively. Both the alumina supported catalyst and the bohemite primer precursor were effectively deposed by dip-coating from stable powder suspensions, whereas insufficient adhesion was obtained when loading pre-synthesised SiO2 over the cordierite. A new method based on sol-gel production of SiO2 from tetraethylortosilicate (TEOS) over the monolith surface was set up. A correlation was derived for the prevision of the amount of silica deposed depending on the amount of TEOS. Both primer and catalyst loading were optimised as for uniformity and stability of the coating and resulted 0.5–1 wt % primer and 0.15 wt % of catalyst. Activity testing confirmed the strong improvement of propene productivity by increasing the time factor (i.e. Ncm3 of flowing reactant/min gcat), which ended in a one order of magnitude increase of productivity for the honeycomb-supported samples with respect to the fixed bed configuration. View Full-Text
Keywords: propene/propylene; oxidative dehydrogenation; olefins production; structured catalysts; structured reactors; V-based catalyst; primer; honeycomb monoliths propene/propylene; oxidative dehydrogenation; olefins production; structured catalysts; structured reactors; V-based catalyst; primer; honeycomb monoliths
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Rossetti, I.; Bahadori, E.; Tripodi, A.; Ramis, G. Structured Monolithic Catalysts vs. Fixed Bed for the Oxidative Dehydrogenation of Propane. Materials 2019, 12, 884.

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