Oxidative Desulfurization of Dibenzothiophene over Tungsten Oxides Supported on SiO2 and γ-Al2O3

Abstract

WO3/γ-Al2O3 exhibited a lower activity than WO3/SiO2 in oxidative desulfurization (ODS) of dibenzothiophene using cumene hydroperoxide as the oxidant. This could be a result of the strong interaction between WO3 and γ-Al2O3. The crystalline WO3 was more active than the tetrahedrally coordinated tungsten oxide species bound on the surface of γ-Al2O3. The loss of WO3 was negligible for WO3/SiO2 after the reaction. These features make SiO2 a promising support for the supported WO3 ODS catalyst.

Amorphous Cr2WO6-Modified WO3 Nanowires with a Large Specific Surface Area and Rich Lewis Acid Sites: A Highly Efficient Catalyst for Oxidative Desulfurization

“…WO 3 , as an important transition metal oxide, has been applied to the ODS of fuel oil in recent years because of its thermal stability and high oxidation states. , It is well known that the catalysts with a large specific surface area (BET surface area) will obtain the higher activities owing to enough surface atoms and active sites, but the BET surface area of WO 3 is often very small (<33 m 2 ·g –1 ) due to its nature of easy crystallization and easy growth to rods or bundles, , and how to increase the BET surface area of WO 3 is the bottleneck. Although the traditional ways of hard template and loading methods can enlarge the BET surface area of WO 3 to some extent, the former involves complex synthesis processes, while the introduction of supports in the latter increases the difficulty on studying the intrinsic catalytic mechanism of WO 3 . ,− With the purpose of making full use of WO 3 and further exploring the ODS process on WO 3 , there is another strategy to be considered and applied, which is the synthesis of WO 3 with nanowire morphology with a super small diameter size (several nanometers). On the one hand, the small size can obtain a large BET surface area, exposing enough active sites; on the other hand, the large aspect ratio of nanowires can effectively avoid the tricky problem of agglomeration, which often occurs in nanoparticles.…”

Starch functionalization of trimetallic W-Mg-Al oxide for oxidative desulphurisation of dibenzothiophene

“…Al2O3 is an acidic oxide which promotes the adsorption of sulphur species. 9 This would promote hydrogenation by protonation followed by hydride transfer in HDS. However, acid catalyst is prone to coking.…”

Preparation of WO3/CNT catalysts in presence of ionic liquid [C16mim]Cl and catalytic efficiency in oxidative desulfurization

“…However, the activity of WO 3 in ODS applications is limited by its low specific surface area. Therefore numerous porous materials such as ZrO 2 , TiO 2 , SBA‐15, g‐C 3 N 4 and Al 2 O 3 have been investigated to increase the catalytic activity of WO 3 in ODS. Although combining WO 3 with carbon nanotubes (CNT) has been reported, most of these reports applied mainly to the field of electrochemistry, using WO 3 as an auxiliary agent to change the interaction between metals and carriers to increase the catalytic activity effectively.…”

“…The influence of the morphology (cuboid or hexagonal plate) and crystal structure (monoclinic or hexagonal) of WO 3 on gas‐sensing properties was studied . The effects of different WO 3 forms on different carriers on ODS performance were also investigated . However, the effects of different WO 3 forms on a single carrier on ODS performance have not yet been investigated.…”

“…26 The effects of different WO 3 forms on different carriers on ODS performance were also investigated. 22 However, the effects of different WO 3 forms on a single carrier on ODS performance have not yet been investigated. Owing to the unique properties of ionic liquids, they have been used as a template agent and precursor in ODS.…”