Keggin- and Dawson-type polyoxotungstates immobilized on poly(3,4-ethylenedioxythiophene)-coated zerovalent iron nanoparticles: Synthesis, characterization and their catalytic oxidative desulfurization activity

Extractive-catalytic oxidative desulfurization of a model fuel over vanadium-containing heteropolyacids immobilized on amine-functionalized magnetic graphene oxide: a comparative study between Keggin and Dawson-type heteropolyacids and process optimization via response surface methodology

“…The higher catalytic activity for Keggin-type HPAs in the ECODS process may be ascribed to the generation of more stable polyoxo–peroxo complexes. 80 It is interesting to note that the Keggin-type HPAs are more active than the Well–Dawson-type HPAs, even though the redox potential is higher for the Well–Dawson-type HPAs. 16 This is reasonably related to the predominant role of polyoxo–peroxo species or peroxo-metallate complexes’ reactivity with H 2 O 2 in the ODS process.…”

Using Keggin-Type Polyoxometalates of PWFe@Fe2O3@Carbon Fiber and PWFe@Fe2O3@Pumice Stone for Catalytic Oxidative Desulfurization of Liquid Model Fuel

“…There are fewer studies on other structures of POMs for the ODS process. Ammar et al investigated Keggin- and Dawson-type POMs for the ODS of model fuel and real gas oil using H 2 O 2 as an oxidizing agent. According to their outcome, for the ODS of model fuel, the activity of the Keggin POTs-based catalyst was higher than that of the Dawson POTs-based catalyst.…”

Key Factors Affecting the Development of Oxidative Desulfurization of Liquid Fuels: A Critical Review

“…As depicted in Figure , POMs are categorized into 10 basic structures . The structures of Keggin, , sandwich, , Dawson, , and Anderson type , were used as catalysts in the ODS process. Among POM structures, the Keggin-type structure was widely employed in the ODS process.…”

“…To overcome these drawbacks, materials with high surface areas were employed as supports . Different supports, including MOFs, chitosan, poly­(vinyl alcohol), titanium dioxide, metal oxides, − graphene oxide, mesoporous silica, magnetic mesoporous silica, activated carbon, multiwalled carbon nanotubes, graphite carbon, mesoporous titania–silica, poly­(3,4-ethylene dioxythiophene), KSF montmorillonite, iron titanate (FeTiO 3 ), β-type cyclodextrin, nanoceramic (MnFe 2 O 4 ), large-pore silica spheres (LPMS), sodium-activated bentonite, TUD-1, the hybrid material of carbon nanotube/MOF, poly­(ionic liquid)/graphene, metal oxide/chitosan, metal oxide/poly­(vinyl alcohol), titanium dioxide/poly­(vinyl alcohol), magnesiocopperite (MgCu 2 O 4 )/poly­(vinyl alcohol), chitosan/poly­(vinyl alcohol), and more have been applied for the preparation of POM-based catalysts. The catalytic activities of POMs are affected by the participating cation and metal .…”