Dysprosium-doped zinc tungstate nanospheres as highly efficient heterogeneous catalysts in green oxidation of terpenic alcohols with hydrogen peroxide

Abstract

A green route to oxidize terpenic alcohols (nerol and geraniol) with H2O2 over a solid catalyst was developed. The Dy-doped ZnWO4 catalyst was synthesized by coprecipitation and microwave-assisted hydrothermal heating,...

Hydroxyl-assisted selective epoxidation of perillyl alcohol with hydrogen peroxide by vanadium-substituted phosphotungstic acid hinged on imidazolyl activated carbon

“…7, the change in the absorption peak with the addition of hydrogen peroxide indicates that the surrounding environment of the heteropolyanion is changed. 51 Through literature research, it was determined that the oxide intermediate formed by the reaction of heteropoly acids and hydrogen peroxide was most likely to be an active intermediate, 51,57 and the epoxidation of double bonds under transition metal catalysis has been reported as a hydroxyl-assisted reaction, 12,58 which is in a competitive relationship with the oxidation of alcohols to aldehydes. The reason for the predominance of epoxidized products can be presumed to be the existence of hydrogen bonds between the active intermediate and the hydroxyl groups of the allyl alcohol.…”

“…Because of their high compound versatility, heteropoly acids are widely used in both homogeneous and heterogeneous processes. 12 It is worth noting, however, that because heteropoly acids are also strong Brønsted acids, they are limited in catalyzing the conversion of monoterpenes.…”

“…15,16 In addition, this team prepared dysprosium-doped zinc tungstate nanospheres to achieve the high-efficiency catalytic oxidation of terpene alcohols (nerol and geraniol). 12 This method efficiently improved the catalytic activity and solved the problem of recyclability of the catalyst. Balula et al 17 synthesized mono- and di-lacunary salts with transition metal cations (Co 2+ , Fe 3+ ) instead of heteropolyanions, and obtained good catalytic effects in the reaction of geraniol and hydrogen peroxide, and the composite material obtained by immobilization on SBA-15 could realize multiple catalytic cycles.…”

Cyclohexane based Bis‐imine and Salicylic Acid Derived Tripodal Amide for Optical Recognition and Enrichment of Sm3+ and Dy3+

“…has major application in laser materials, [25,26] as control rod in nuclear reactor, [27] IR radiation source, [28] data storage application, [29] electric car motors, [30] wind turbine generators [31] and terfenol-D. It is used for the synthesis of chromenes, [32] hydrogenation, [33] oxidation of terpenic alcohols, [34] ring opening of meso-epoxide, [35] oxidation of sulfide, thiol, [36] heterogeneous water oxidation, [37] in dosimetry [38] and bone mineral analysis. [39] Both Sm and Dy are used for treatment of cancer.…”

A simple hydrothermal route for the preparation of novel Na–Y–W nano-oxides and their application in dye degradation

“…13,14 Among the nanostructures, the tungstate group is a substantial and particular nano-oxide. [15][16][17][18][19] The momentous sub-group of the tungstate group is NaY(WO 4 ) 2 , a double alkaline rare-earth tungstate that involves a large group of structures with formula MRE(WO 4 ) 2 , in which M denotes a monovalent cation (Na + , K + ), Re is a trivalent cation (Y +3 , Yb +3 ), and WO 4 is a divalent anion, which has various utilizations, such as scintillators, 20 displays (LEDs), 21 catalysis, 22 optical waveguide, 23 and environmental control. 24 NaY(WO 4 ) 2 was manufactured through a solution-based method due to the superb individual chemical characteristics and morphology rather than the solid-state approach, which requires high temperature to obtain pure particles.…”