Ultra-deep oxidative desulfurization of high sulfur liquid fuels with molybdenum carbide@carbon loaded on N-doped graphene

Defective silicotungstic acid-loaded magnetic floral N-doped carbon microspheres for ultra-fast oxidative desulfurization of high sulfur liquid fuels

“…77 To further verify the generation of HO˙ during the catalytic H 2 O 2 oxidative decomposition catalyzed by γ-Fe 2 O 3 @NC@SiW 12 -300 catalyst, the generation of hydroxide radicals in the model oil was investigated by electron paramagnetic resonance (EPR) by employing 5,5-dimethylpyrroline-oxide (DMPO) as a free radical trapping agent. 78 As shown in Fig. 10b, the characteristic peak signal of DMPO-HO˙ was detected in the γ-Fe 2 O 3 @NC@SiW 12 -300 system with a four-fold peak area ratio of 1 : 2 : 2 : 1, which is in agreement with the literature report, 79 confirming the generation of HO˙ in the system.…”

Engineering a Local Hydrophilic Environment in Fuel Oil for Efficient Oxidative Desulfurization with Minimum H2O2 Oxidant

“…Mo-based heterogeneous catalysts have garnered significant attention in the oxidation of thiophenic sulfides. , While bulk molybdenum oxides have demonstrated unsatisfactory ODS catalytic activity, dispersing molybdenum oxides nanoparticles on appropriate supports, such as metal oxides, molecular sieves and carbon materials, has yielded a substantial enhancement in catalytic performance. , Carbon materials, particularly graphene and CNTs, are promising supports for Mo-based catalysts due to their large surface area and lipophilic properties, which facilitate optimal contact with SCC in the oil phase. , Moreover, heteroatom-doped carbon materials offer a unique electron-donating ability, which guarantees a constant electrons supply to the active sites . In fact, ODS reaction involves two different processes with changing time scales: (1) physicochemical processes around the catalyst (mass transfer) and (2) chemical process at the catalytic active sites. , Almost all previous strategies for elevating ODS performance have focused on increasing the lipophilic property to improve the mass transfer of SCC and modifying the electronic structure to create efficient active sites .…”

“…1,15 Carbon materials, particularly graphene and CNTs, are promising supports for Mo-based catalysts due to their large surface area and lipophilic properties, which facilitate optimal contact with SCC in the oil phase. 16,17 Moreover, heteroatom-doped carbon materials offer a unique electron-donating ability, which guarantees a constant electrons supply to the active sites. 18 In fact, ODS reaction involves two different processes with changing time scales: (1) physicochemical processes around the catalyst (mass transfer) and ( 2) chemical process at the catalytic active sites.…”