Highly Ordered Mesoporous WO₃ with Excellent Catalytic Performance and Reusability for Deep Oxidative Desulfurization

Abstract

Highly ordered mesoporous tungsten trioxide (WO 3 ) with high surface area (75 m 2 /g) and wellde¯ned mesopores were successfully prepared through a hard templating method using a mesoporous silica KIT-6 as a template and (NH 4 ) 6 H 2 W 12 O 40 Á xH 2 O as a tungsten precursor. Oxidative desulfurization of a model oil with H 2 O 2 as the oxidant was carried out at 50 C under atmospheric pressure in order to analyze the catalytic activity. The desulfurization reactions were optimized by various kinds of reaction parameters such as H 2 O 2 /S molar ratio, reaction temperatures and series of sulfur-containing compounds [dibenzothiophene (DBT), benzothiophene (BT) and 4,6-dimethyl dibenzothiophene (4,6-DMBT)]. Excellent catalytic activity for the removal of the sulfur-containing compounds from the model oil was observed with mesoporous WO 3 catalyst, where the activity was maintained during 5 recycle tests without any regeneration process. The high catalytic activity and durability is mainly attributed to well-de¯ned mesopores and high surface area of mesoporous WO 3 catalyst.

Efficient and reusable ordered mesoporous WOx/SnO2 catalyst for oxidative desulfurization of dibenzothiophene

“…This indicates that the higher temperature is beneficial for H 2 O 2 oxidation because the higher oxidation reaction rate at low temperatures might be limited by kinetics. 57 According to the above analysis, 50 °C was chosen as the optimal reaction temperature in this work.…”

Efficient catalytic oxidative desulfurization of liquid fuels over tungsten oxide supported on metakaolin surface

“…The maximum efficiency with complete DBT removal was obtained under the optimum conditions of H 2 O 2 /S 5 : 1, catalyst content 0.1 g, temperature 50 °C and reaction time 120 min. [15] He et al synthesized an amphiphilic tungsten oxide with oxygen vacancies for applying in the ODS process. They obtained a complete desulfurization rate, which originated from acid treatment as a promising method to enhance the number of oxygen-deficient sites.…”

Ultralow sulfur diesel production with defective 12-molybdophosphoric acid polyoxometalate

“…[12][13][14][15] An effective catalyst is the core of the ODS process. Among the ODS catalysts reported so far, there is a wide spectrum of transition metal oxides, such as Mo(VI), 16,17 W(VI), [18][19][20] V(V), [21][22][23] Ti(IV), 24,25 and Fe(III) oxides 26,27 dispersed on different supports for ODS reactions. Many investigations show that the catalysts' activity highly depends on the metal oxidation states, surface acidity, active site distribution, and textural properties.…”