Aerobic Oxidative Desulfurization of Liquid Fuel Catalyzed by P–Mo–V Heteropoly Acids in the Presence of Aldehyde

Abstract

Aerobic oxidative desulfurization (ODS) of model liquid fuel (dodecane spiked with dibenzothiophene (DBT)) was carried out in the presence of bulk and supported Keggin-type heteropoly acids H3+nPMo12-nVnO40 (HPA-n, n = 0–3) as heterogeneous catalysts and benzaldehyde as a sacrificial reductant. In the presence of bulk H4PMo11VO40 (HPA-1), 100% of DBT was removed from fuel (converted to DBT sulfone) at 60 °C and ambient air pressure. Multiple catalyst reuse without loss of activity was demonstrated. The ODS reaction was strongly inhibited by radical scavengers. An unbranched radical chain mechanism was proposed.

Aldehyde-Assisted Aerobic-Oxidative Desulfurization of HDS Diesel Fuels by a Highly Effective Heterogeneous V-Substituted Keggin-Type Semiorganic Catalyst: Modeling of Experimental Design and Mechanistic and Kinetic Insights

“…As it has been reported, the substitution of one or more W 6+ by V 5+ ions in HPW-0 might increase the catalytic activity owing to the multielectron transfer mechanism to undergo fast V 5+ /V 4+ redox transformations within the (AP) 5 PWV 2 catalyst under mild conditions that are mainly responsible for its catalytic property as well as being documented for V-substituted heteropoly compounds. − …”

“…The suggested unbranched radical chain mechanism for the aldehyde-assisted AODS reaction catalyzed by (AP) 5 PWV 2 is in good agreement with the experimental data. Similar radical mechanisms have been previously proposed for the aerobic co-oxidation of alkenes and alkanes with aldehydes catalyzed by HPOMs. − …”

Synthesis of modified amphiphilic quaternary ammonium silicotungstate and its application in heterogeneous catalytic oxidative desulfurization

“…11 were basically The oxidant used in ref. 50 is air, and the recycling performance of some catalysts has not been studied. Reaction Chemistry & Engineering Paper consistent, which further proved that (HTA) 4 SiW had great recycling and regenerating capacity for DBT removal.…”