Abstract
Owing to the increasingly serious environmental issues caused by the sulfur burnt in fuel, desulfurization has become an important topic. In this work, an amphiphilic oxygen-defective tungsten oxide was synthesized by a colloidal chemistry method. The amphiphilic property and oxygen defects were well characterized, and the structure of the oxygen-defective tungsten oxide catalyst was investigated. In addition, the catalyst was employed in oxidative desulfurization system of fuel, and deep desulfurization was achieved. It was found that the very high oxidative desulfurization performance of oxygen-defective tungsten oxide catalyst resulted from both the amphiphilic property and oxygen defects. This work can provide a strategy for preparation of highly active metal oxide catalysts with oxygen defects in oxidative desulfurization reaction of fuel.
Highlights
Emission of SOx, originating from the combustion of sulfur compounds in fuel, has become an increasingly serious issue (Wu et al 2016b; Zhao et al 2017; Xiao et al 2016; Lu et al 2017; Gu et al 2017; He et al 2017)
The results show that the peaks around 810 cm-1 and 700 cm-1 are the characteristic peaks of O–W–O, and the very small peak at 950 cm-1 is due to the stretching modes of O–W–O
A ligand-covered tungsten oxide with oxygen defects was successfully obtained by a colloidal chemistry method
Summary
Emission of SOx, originating from the combustion of sulfur compounds in fuel, has become an increasingly serious issue (Wu et al 2016b; Zhao et al 2017; Xiao et al 2016; Lu et al 2017; Gu et al 2017; He et al 2017). Our group employed graphene-like hexagonal boron nitride as a support for dispersion of tungsten oxide to prepare the WOx in nanoparticle form (Wu et al 2015b) Such strategy is less universally applicable and involves high-temperature treatment. Preparation of metal/metal oxides by colloidal preparation methods has attracted increasing attention because of the successful synthesis of nano-sized materials and a controllable process (Guo et al 2013; Jiang et al 2015a; Wu et al 2015a; Zhang et al 2014b; Zhu et al 2013a, b) Such a process is usually realized in an oil phase, making organic ligands abundant on the surfaces of metal/metal oxide. The current work may provide a strategy for preparation of highly active and amphipathic catalyst for deep oxidative desulfurization
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