Abstract
In order to meet the stringent environmental and industrial legislation on fuel specifications, sulfur compounds have to be removed efficiently from fuels. The requirement to produce ultralow-sulfur fuels (S < 10 ppm) has stimulated many works in the area of conventional hydro-desulfurization (HDS) method. Oxidative desulfurization (ODS), as an alternative or complementary technology to HDS for deep desulfurization, is conducted with high selectivity and reactivity to sterically hindered S compounds under mild reaction conditions. In the ODS process, using an appropriate oxidant in the presence of a catalyst, organic sulfur compounds can be oxidized selectively to their corresponding sulfoxides and sulfones, which can be easily removed by different separation methods. Having great catalytic characteristics, polyoxometalate materials have been utilized as a vital class of catalysts for deep desulfurization of fuels. In the past few decades, ODS of fuels using polyoxometalate as catalyst has drawn much attention, and various studies have been carried out in this area. Here, we give a critical review for the removal of sulfur compounds from liquid fuels (mostly from diesel and model fuels) by ODS via homogeneous and heterogeneous polyoxometalate catalysts.
About the authors
Majid Taghizadeh received the BSc degree from Tehran University, Iran, in 1988, the MSc degree from Amirkabir University of Technology, Iran, in 1991, and the PhD degree from the University of Claude Bernard Lyon1, France, in 1998, all in chemical engineering. He is currently a professor of chemical engineering at Babol Noshirvani University of Technology, Babol, Iran. His research areas include catalysis, kinetics and reactor design, hydrogen production and purification, and molecularly imprinted polymers. He has published 70 journal papers and presented more than 150 papers in conferences.
Elaheh Mehrvarz received the Bachelor’s and Master’s degrees in chemical engineering from Babol Noshirvani University of Technology (BNUT), Iran, in 2014 and 2016, respectively. She is currently pursuing the PhD degree in chemical engineering at BNUT. Her research interests include separation processes, porous materials, and gas adsorption technology.
Amirhossein Taghipour received the Bachelor’s degree from Mazandaran University, Iran, in 2013, and the Master’s degree from Babol Noshirvani University of Technology (BNUT) in 2016, both in chemical engineering Currently, he is pursuing the PhD degree at BNUT. His research is focused on ultrasonics, process design and control, CFD, risk assessment, and thermodynamics. Specifically, he and his team are working on ultrasonic-assisted processes such as ultrasonic-assisted defouling and ultrasonic-assisted extraction.
Acknowledgments
The authors acknowledge the financial support by Babol Noshirvani University of Technology, Iran, through grant no. BNUT/370152/97.
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