Tungstate supported mesoporous silica SBA‐15 with imidazolium framework as a hybrid nanocatalyst for selective oxidation of sulfides in the presence of hydrogen peroxide

Abstract

In this work, a new heterogeneous catalyst (SBA‐15/Im/WO42−) was prepared, and then its performance in the oxidation of organic sulfides was studied (using 30% H2O2 as green oxidant under neutral reaction conditions). This organic–inorganic hybrid mesoporous material was characterized by various techniques, such as FT‐IR, inductively coupled plasma, X‐ray powder diffraction, high‐resolution‐transmission electron microscopy, N2 adsorption–desorption and thermogravimetric analysis. The catalyst was also applied to the selective oxidation of various sulfides. The hybrid catalyst was easily recovered, and was very stable and retained good activity for at least five successive runs without any additional activation. Moreover, there was no remarkable decrease in the activity and selectivity of the catalyst. The products could be easily isolated by just removing the solvent after filtering the catalyst. The yields of the catalytic productions through this catalyst were in the range from 75% to 97%.

Low-Frequency Spectra of 1-Methyl-3-octylimidazolium Tetrafluoroborate Mixtures with Poly(ethylene glycol) by Femtosecond Raman-Induced Kerr Effect Spectroscopy

“…The structure of the synthesized OIm was confirmed by 1 H NMR and 13 C NMR (Figures S1 and S2). 69,70 The synthesized OIm was dried in vacuum at room temperature for over 36 h before use. EG (Kanto Chemical, >99.5%) was used after drying with molecular sieves 3A (Kanto Chemical).…”

Scaled‐up, selective and green synthesis of sulfoxides under mild conditions using (CeIII‐MoVI)Ox/aniline hybrid rods as an efficient catalyst

“…[15][16][17] Therefore, a large number of methods, procedures and oxidizing agents have been proposed for this type of transformation. [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] Despite the fact that amines such as aniline, pyridine and … are not an appropriate catalyst for the oxidation reactions, they can effectively modify the catalytic activity of the molybdates and molybdenum oxides due to the electronic interactions between these amines and the active sites in the hybrid structures. However, majority of these traditional protocols rely on the use of hazardous terminal oxidants with low content of effective oxygen, and high cost which can generate hazardous by-products.…”

“…This feature has stimulated the development of useful procedures for H 2 O 2 oxidation with various types of catalytic systems. [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] Despite the fact that amines such as aniline, pyridine and … are not an appropriate catalyst for the oxidation reactions, they can effectively modify the catalytic activity of the molybdates and molybdenum oxides due to the electronic interactions between these amines and the active sites in the hybrid structures. [12,14,[46][47][48][49] In recent years, owing to the redox properties of ceria, various types of ceria-based catalysts including cerium (IV) triflate, [50] ammonium cerium (IV) nitrate, [51] immobilized cerium alkyl phosphonate [52] and heterobimetallic cerium (IV) oxo clusters [53] are also widely used in selective oxidation of sulfides.…”

Recent Advances in Catalytic Oxidation of Organic Sulfides: Applications of Metal–Ionic Liquid Catalytic Systems

“…Sedrpoushan et al prepared a new heterogenous catalyst (SBA-15/Im/WO 4 2− ) and studied its catalytic performance in the selective oxidation of organic sulfides with H 2 O 2 under neutral conditions. Various sulfides could be efficiently converted into the corresponding sulfoxides with good to excellent yields and selectivities ( Sedrpoushan et al, 2018 ). Moreover, the supported ionic liquid catalyst could be easily recovered and retained its good activities for five recycles without any loss of catalytic activity.…”

“… Pathways of WO 4 2− @SBA-15/IL fabrication and catalytic oxidation of organic sulfides ( Sedrpoushan et al, 2018 ). …”