Abstract
An effective and sustainable process capable of simultaneously execute desulfurization and denitrogenation of fuels is in fact an actual necessity in the refinery industry. The key to achieve this goal is the parallel oxidation of sulfur and nitrogen compounds present in fuels, which is only achieved by an active and recovered catalyst. A novel heterogeneous catalyst was successfully prepared by the encapsulation of an imidazolium-based polyoxometalate (POM) into a ZIF-8 framework ([BMIM]PMo12@ZIF-8). This composite material revealed exceptional catalytic efficiency to concurrently proceed with the oxidative desulfurization and denitrogenation of a multicomponent model fuel containing various sulfur and nitrogen compounds. A complete removal of all these compounds was achieved after only one hour and the catalyst system was able to be reused for ten consecutive cycles without loss of efficiency. In fact, an ionic liquid POM was incorporated in the ZIF-8 for the first time, and this composite compound was originally applied as a catalyst for simultaneous oxidative desulfurization and denitrogenation processes.
Highlights
Fuel consumption and combustion is known to cause emissions of SOx and NOx which are harmful to the environment [1,2]
A novel composite prepared by the encapsulation of the ionic liquid polyoxomolybdate [BMIM]3 PMo12 into a Zeolitic frameworks (ZIFs)-8 framework was successfully isolated and characterized
The isolated material [BMIM]3 PMo12 @ZIF-8 was used as heterogeneous catalyst to simultaneously remove sulfur and nitrogen from a model fuel via oxidation
Summary
Fuel consumption and combustion is known to cause emissions of SOx and NOx which are harmful to the environment [1,2]. Regulations have been put in place to limit the amount of sulfur and nitrogen present in commercial fuels To meet these parameters, the fuel industry resorts to hydrotreating processes such as hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) [3]. The fuel industry resorts to hydrotreating processes such as hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) [3] These techniques are considerably unsustainable since they demand high economic and energetic costs, and they require high temperature (>350 ◦ C) and pressure (up to 6MPa) conditions [3,4]. Oxidative desulfurization (ODS) and oxidative denitrogenation (ODN) have been presented as low-cost, eco-friendly and efficient alternatives to HDS and HDN, respectively [6–9]. These processes occur under lower temperatures, at atmospheric pressure and with the aid of a green oxidant and a suitable catalyst [10–12]. One of the challenges associated with the scale-up of ODS/ODN processes relates to catalysts durability and reutilization [13,14]
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