One-pot synthesis of ultrasmall MoO₃ nanoparticles supported on SiO₂, TiO₂, and ZrO₂ nanospheres: an efficient epoxidation catalyst

Abstract

Utilization of ultrasmall MoO3 nanoparticles supported on silica nanospheres to be a recyclable catalyst in olefin epoxidation.

Recent Advances in Facile Liquid Phase Epoxidation of Light Olefins over Heterogeneous Molybdenum Catalysts

“… Schematic representation of the synthetic procedure of (a) MoOx@HSS, and (b) MoO 3 /SiO 2 , (c) Au/MoO 3 …”

Mesoporous crystalline–amorphous oxide nanocomposite network for high-performance lithium storage

“…The signal of pure TiO 2 particles presents two Ti 2p peaks at 458.5 eV and 464.7 eV for Ti 2p 3/2 and Ti 2p 1/2 , respectively, which is consistent with the standard Ti 4+ binding energy reported previously. 9 Clearly, a slight shift towards higher binding energies (~1.5 eV) can be observed in the Ti 2p peaks for TMON-47%, which is possibly due to the dehydroxylation of Ti-O-Mo bonds at the oxide interface. 8 Fig 3B represents typical Mo 3d curves for MoO 3 particles and TMON with two peaks at 235.6/232.6 eV and 235.8/232.8 eV for Mo 3d 3/2 /Mo 3d 5/2 , respectively, indicating comparable binding energies and existence of dominating Mo 6+ .…”

“…8 Fig 3B represents typical Mo 3d curves for MoO 3 particles and TMON with two peaks at 235.6/232.6 eV and 235.8/232.8 eV for Mo 3d 3/2 /Mo 3d 5/2 , respectively, indicating comparable binding energies and existence of dominating Mo 6+ . 9 Note that with the discriminated Mo 3d doublet of TMON towards low binding energy, the peaks at 234.5 eV (Mo 3d 3/2 ) and 231.3 eV (Mo 3d 5/2 ) can be ascribed to the intermediate Mo 5+ species. 10 The existence of a small amount of low-valance Mo 5+ can lead to increased electronic conductivity and improved charge transport behavior.…”

Mesoporous Titania: Synthesis, Properties and Comparison with Non-Porous Titania

“…The surfactant is then removed by extractions/centrifugation/washing, and then a final calcination step brings about the total removal of the organic part as well as M-TiO 2 crystallisation [44]. After calcination, M-TiO 2 NPs form aggregates with interparticle porosity (Figure 4c).…”

“…The optional addition of a swelling agent (like n-BuOH) allows tuning mesopore dimension [52]; (b) an ionic surfactant, like cetyltrimethylammonium bromide (CTAB). NBB resulting from partial condensation of the precursor may have a charged surface due to pH-dependent protonation of ≡Ti-OH to ≡Ti-OH 2 + and are stabilised by the negative charge of the anion [50,51]; and (c) diblock copolymer, such as Brij-n, which forms inverse micelles in cyclohexane [44].…”