Abstract
Porous metal-organic framework (MOF) materials UiO-66(Zr) obtained by solvothermal and microwave advanced synthesis (MWAS) procedures were characterized, and their catalytic efficiency was investigated for oxidative desulfurization (ODS) processes using a multicomponent model diesel containing benzothiophene and dibenzothiophene derivatives. The preparation parameters as the cooling time after oven use in the solvothermal procedure, and also the reaction time in the MWAS method seemed to play an important role in the catalytic performance of the UiO-66(Zr) material, as well as in its recycle capacity. The material prepared by the solvothermal procedure with a fast cooling time showed the best catalytic performance (desulfurization efficiency of 99.5% after 3 h). However, the application of the UiO-66(Zr) material prepared by the MWAS method (desulfurization efficiency of 96% after 3 h) conciliated a higher number of advantages, such as shorter reaction time preparation (15 min) and high catalytic activity for a higher number of reaction cycles. The UiO-66(Zr) prepared by the MWAS method was used for the first time in an oxidative desulfurization process, and according to the catalytic results obtained (high recycle capacity and stability) and shorter reaction time preparation, seems to be a promising material for industrial application.
Highlights
The incessant need for energetic and environmental sustainable development has promoted high attention to fossil fuel consumption and production, since it is still the main source of energy for many purposes, namely transportation
Two distinct samples of the porous metal-organic framework (MOF) material UiO-66(Zr) were prepared by solvothermal synthesis [UiO-66(Zr)-S1 and UiO-66(Zr)-S2] and three different samples were isolated by microwave advanced synthesis (MWAS) [UiO-66(Zr)-MW1, UiO-66(Zr)-MW2 and
A significant difference of catalytic activity was found between UiO-66(Zr) samples prepared by the solvothermal method, indicating that a fast cooling after the oven use is preferred than a slower cooling
Summary
The incessant need for energetic and environmental sustainable development has promoted high attention to fossil fuel consumption and production, since it is still the main source of energy for many purposes, namely transportation The combustion of these fuels is associated with emissions of different sulfur oxides and fine particles of metal sulfates to the atmosphere, originated from sulfur content present in crude oil [1]. These emissions are responsible for many environmental problems related to acid rain and associated with public health issues, which have stimulated reasonable international legislative regulation over the petrochemical industry [2]. HDS is not an effective method for the removal of heterocyclic sulfur compounds such as thiophenes and its derivatives, which are the other main groups of sulfur content present in fuels [4]
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