V₂O₅/SBA-15 nanocatalysts for the selective synthesis of 2,3,5-trimethyl-1,4-benzoquinone at room temperature

Abstract

The molecular designed dispersion method yielded monodispersed nanoscale (4–7.5 nm sized) V2O5 dimeric species on SBA-15, which oxidized TMP into TMBQ with H2O2 under green conditions.

Selective oxidation of styrene by H2O2 over novel supported palladium(ii)-based catalysts

“…The two weaker peaks at around 2 θ = 1.54° and 1.78° are the secondary diffraction peaks on the (110) crystal plane and the (200) crystal plane, respectively, indicating the presence of a two-dimensional hexagonal mesoporous structure in the material. 34 After the functionalization of the support, the three characteristic diffraction peaks of (100), (110) and (200) are still present, which proves the structural stability of the mesoporous material. Moreover, the characteristic diffraction peak of the (100) crystal plane for the catalyst SBA-15-B-Pd is shifted to the position of 2 θ = 0.9°, and the face spacing at d 100 is reduced according to Bragg's theorem, which may be due to the enhanced layer-to-layer interaction between the mesoporous material and the coordination of palladium and the ligand.…”

Aerobic Oxidation of Alcohols Catalyzed by V2O5Rods Decorated on Graphene Oxide

“…V 2 O 5 has been supported on various heterogeneous solid supports and their activity was examined in the oxidation reactions. For example, manganese and vanadium oxide was reported as a solid catalyst for the oxidation of alcohols, vanadia dispersed on alumina catalysts for the aerobic oxidation of alcohols, mesoporous vanadium oxide for the oxidation of diphenylmethane to benzophenone, vanadia supported on rice husk silica for the oxidation of benzyl alcohol with H 2 O 2 as oxidant, microporous vanadium silicates for the oxidation of alkylaromatics, oxidation of toluene over V 2 O 5 , allylic oxidation of cyclohexene using TiO 2 modified V 2 O 5 /MoO 3 catalysts, vanadium(V) oxide nanorod promoted Pt/rGO electrocatalyst for alcohol oxidation, V 2 O 5 /SBA‐15 nanocatalysts for the synthesis of 2,3,5‐trimethyl‐1,4‐benzoquinone, ordered mesoporous V 2 O 5 /WO 3 composite for the oxidation of aryl alcohols, oxidation of crotyl alcohol using V 2 O 5 /MgO, limonene oxidation by V 2 O 5 /TiO 2 catalysts, photooxidation of hydrocarbons using V 2 O 5 /Al 2 O 3 and photooxidation of cyclohexane by V 2 O 5 /Al 2 O 3 . As commented earlier, V 2 O 5 ‐based heterogeneous catalysts were reported for oxidation of benzyl alcohols at higher reaction temperature with excess of oxidants like peroxides.…”

Recent progress in catalytic oxygenation of aromatic C–H groups with the environmentally benign oxidants H2O2 and O2

“…Burri and coworkers studied a heterogeneous catalyst ( 53) , prepared from V 2 O 5 , supported on SBA‐15 (10 wt.% V 2 O 5 ) for the oxidation of 2,3,5‐trimethyl‐phenol with H 2 O 2 . [ 102 ] Under optimal reaction conditions, the catalyst system provided 95% yield of TMBQ in ethanol at room temperature (Scheme 56). The product yield gradually declined after several cycles (down to 85% after the fifth run).…”