Enhanced catalytic activity of TAPO-5 in the oxidation of cyclohexene with hydrogen peroxide under anhydrous conditions

Nanocrystalline M–MOF‐74 as Heterogeneous Catalysts in the Oxidation of Cyclohexene: Correlation of the Activity and Redox Potential

“…In this sense, the activity of Ti‐MCM‐41 catalysts in the epoxidation of alkanes is weakened if anhydrous TBHP becomes hydrated 28. As a second possible reason, water acts as an inhibitor in the oxidation of cyclohexene through the radical route,24a, b which dominates over the epoxidation route under the tested conditions. Finally, this radical route requires the homolytic rupture of the OO bond of the peroxide, which has been calculated to be more unfavorable for H 2 O 2 than for TBHP in the presence of a Ni‐based catalyst 29…”

“…These aliquots were analyzed by GC (Varian 430 GC; capillary column of 15 m length, 0.25 mm diameter, 1 μm stationary phase thickness; flame ionization detection; FID) and TXRF after filtration (filter paper with pores of 0.45 μm). Identification of the noncommercial 2‐cyclohexenyl peroxide product was performed as described elsewhere 24a. As a result of the high volatility of cyclohexene, its conversion was calculated indirectly through the sum of the detected products.…”

Ti(III)APO-5 materials as selective catalysts for the allylic oxidation of cyclohexene: Effect of Ti source and Ti content

“…We have reported elsewhere that this approach indeed generates TAPO-5 catalysts that are more active than the conventional ones, being able to oxidize cyclohexene at a rate of the same order as large-pore Ti-beta [27] under suitable conditions. This work extends the study of TAPO-5 materials prepared from gels containing Ti(III) ions, here called Ti(III)APO-5, as catalysts in the cyclohexene oxidation with H 2 O 2 under anhydrous conditions.…”

“…Catalysts were tested in the oxidation of cyclohexene with H 2 O 2 under anhydrous conditions as described elsewhere [27]. These conditions were reached after removing almost all the water that accompanies the commercial 30 wt.…”

“…Water was removed by Soxhlet extraction of solutions prepared dissolving the 30 wt. % Products were identified by mass spectrometry, 1 H and 13 C NMR and infrared spectroscopies, as described elsewhere [27]. Conversions were calculated from the yields of the resultant products.…”