MoO₃ subnanoclusters on ultrasmall mesoporous silica nanoparticles: an efficient catalyst for oxidative desulfurization

Abstract

MoO3 subnanoclusters encapsulated in ultrasmall mesoporous silica nanoparticles (ca. 14 nm) exhibited enhanced catalytic activity for oxidative desulfurization.

Sono-oxidative desulfurization of fuels using heterogeneous and homogeneous catalysts: A comprehensive review

“…Nanoparticles improve the adsorption of sulfur compounds due to their large surface area [53] . Photocatalyst under UV [54] or visible light [55] , nano-sized silica particles including mesoporous silica [56] , aluminum oxide particles [57] , transition metal oxides [58] , activated carbons [59] , modified metal–organic frameworks [60] , Ni catalyst also called sponge metal [61] , nanocomposite [62] , graphene oxide [63] , activated carbon (AC)-supported phosphotungstic acid [64] and fly ash-modified fenton catalysts [65] are used. In the case of using heterogeneous catalysts, the catalytic ODS mechanism [66] , [67] , [68] , [69] , [70] is illustrated in Scheme 1 .…”

Recent Advances in Functionalized Mesoporous Silica Frameworks for Efficient Desulfurization of Fuels

“…Some researchers, like Wang et al, reported on the synthesis of subnano-MoO 3 supported on ultrasmall MSN particles (~14 nm) with a peculiar “raisin-bun” structure, using reverse microemulsion technique ( Figure 4 a) [ 105 ]. This hybrid catalyst, subnano-MoO 3 /ultrasmall MSN (UMSN), was then used for ODS of a model diesel comprising of benzothiophenes, where they were oxidized to DBTO 2 with a 100% efficiency within 15 min (Time of flight, TOF of ODS: 53.3/h) ( Figure 4 b) [ 106 ]. Percentage of catalyst, reaction time, and temperature influenced the DBT conversion; however, the percentage of oxidant did not play a significant role.…”

“… ( a ) Schematic representation for the formation of subnano-MoO 3 /ultrasmall mesoporous silica nanoparticles (UMSN); ( b ) catalytic mechanism of MoO 3 catalyzing dibenzothiophene (DBT) oxidation in the presence of TBHP (tert-butyl hydro peroxide) [ 106 ]. …”

Zeolite Stabilized Isolated Molybdenum Species for Catalytic Oxidative Desulfurization

“…随着循环次数的增加, DBT 的氧化脱硫效率 从 99.3%降低至 98.4%, 这微小的下降归因于循环洗涤 过程中导致的催化剂少量损失, 催化剂整体表现出了优 异的稳定性. 而 SiO 2 为载体时, 氧化脱硫效果在 5 次循 环后降低为 58.7%, 这与 Mokhtari [81] 和 Wang [23] [37][38][39][40][41]…”

“…据报道, 高空间位阻的硫化物如 二苯并噻吩更容易通过 ODS 去除 [12][13][14][15][16] . 氧化脱硫反应 中使用的催化剂种类繁多, 比如杂多酸体系 [16] 、金属有 机体系 [17][18] 以及负载型催化剂等 [19][20] , 其中负载型氧化 钼催化剂表现出优异的催化性能 [13,[21][22][23][24] .…”