CrAPO-catalyzed oxidations of alkylaromatics and alcohols with TBHP in the liquid phase (redox molecular sieves, part 8)

Liquid-phase epoxidation of olefins by manganese oxide octahedral molecular sieves

“…Titanium silicate (TS-1) was found to be an effective heterogeneous catalyst for the selective oxidation of olefins [2] using dilute hydrogen peroxide as an oxidizing agent under mild conditions, after which titanium silicate (TS-2) [3] and Ti-ZSM-48 [4] followed in effectiveness. Other interesting results have also been obtained with Ti, V, Cr, and Sn containing zeolites or aluminophosphates [5][6][7][8][9]. Pyridines as bifunctional cocatalysts in the chromium oxide-catalyzed oxidation of olefins by tertiary-butyl hydroperoxide have also been reported [10].…”

Synthesis, characterization and catalytic oxidation activity of zirconium doped K-OMS-2 type manganese oxide materials

“…Titanium substituted silicates usually catalyze ring hydroxylation of arenes and substitution of vanadium [12][13][14], tin [15][16][17][18] and chromium [19][20][21] into zeolite and aluminophosphate structures favors side chain oxidation. Most notably, chromium substituted aluminophosphate, Cr-APO-5, catalyzes the formation of ketones from alkyl arenes with TBHP (tert-butyl hydrogen peroxide) as oxidant in moderate yields with selectivity greater than 90% [21][22][23]. Role of lattice oxygen in manganese oxide OMS-2 catalyst in selective oxidation of benzyl alcohol in the presence of chemical oxidant has also been reported and they the mechanism of benzyl alcohol oxidation has been proposed based on kinetic and isotope labeling studies [24].…”

Side-chain oxidation of ethylbenzene with tert-butylhydroperoxide over mesoporous Mn-MCM-41 molecular sieves

“…The oxidation of many organic substrates using H 2 O 2 as oxidant over Ti 4+ analogues of ZSM-5 (TS-1) and ZSM-11 (TS-2) has been well-documented [2][3][4]. Titanium substituted silicates have been thought to catalyze ring hydroxylation of arenes with H 2 O 2 , but vanadium [5][6][7][8][9][10][11][12], tin [9][10][11][12][13] and chromium [14][15][16] substitution into a variety of zeolites and aluminophosphate molecular sieves has led to favored oxidation at the side-chain. The presence of molecular oxygen or single oxygen atom donors such as tert-butylhydroperoxide for the oxidation of alkanes to alcohols and ketones are shown to be important [17][18][19][20].…”

“…The presence of molecular oxygen or single oxygen atom donors such as tert-butylhydroperoxide for the oxidation of alkanes to alcohols and ketones are shown to be important [17][18][19][20]. Chromium substituted aluminophasphate catalysts are found to favor the formation of ketones from alkyl arenes with TBHP as an oxidant [16]. Manganese analogues of these systems have also been shown to catalyze oxidation of alkanes using TBHP [21][22][23][24][25].…”