Synthesis, characterization and catalytic oxidation of alcohols with chromium-substituted aluminophosphates

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].…”

Zirconium Doped Tunnel Structure Manganese Oxide OMS-2 Catalysts

“…In classical synthetic laboratory procedures, permanganate or dichromate has been used preferably as stoichiometric oxidant for oxidation reaction. Normally, titanium substituted silicates are usually thought to catalyze ring hydroxylation of arenes, and substitution of vanadium [8][9][10][11][12], tin [13][14][15][16], chromium [17][18][19] into zeolite and aluminophosphate structures favor side chain oxidation. Most notably, chromium substituted aluminophosphate, Cr-APO-5, catalyzes the formation of ketones from alkyl arenes with TBHP as oxidant in moderate yields with good selectivity greater than 90% [19][20].…”