A moderate and efficient method for oxidation of ethylbenzene with hydrogen peroxide catalyzed by 8-quinolinolato manganese(III) complexes

Influence of the synergistic effect between Co–N–C and ceria on the catalytic performance for selective oxidation of ethylbenzene

“…Nevertheless, ethylbenzene conversions over Co-N-C/Fe 2 O 3 and Co-N-C/Al 2 O 3 are 17.8% and 16.2%, respectively, much lower than that over Co-N-C/CeO 2 . Interestingly, Co-N-C/uMO catalysts exhibit even lower catalytic activity than Co-N-C/MO catalysts for ethylbenzene oxidation (Table 1, entries [11][12][13][14][15][16][17][18], indicating that the support modification is necessary to enhance the catalytic activity and stability (Table 1, entries 11-13 and Table 2). Pham et al investigated whether the modification of the support surface with organosilane may improve the stability of particles in an organic solvent.…”

“…[5][6][7][8][9][10] The basis is the employment of transition metals or organometallic centers, which is pivotal for the successful attack on the targeted C-H bonds of hydrocarbons. 5 Based on the above concepts presented, cobalt tungstate 11 and 8-quinolato manganese(III) complexes 12 are typical homogeneous catalysts that combine with H 2 O 2 as an oxidant, but they are difficult to separate from the products. In this regard, heterogeneous catalysts such as alumina-supported potassium dichromate 13 and molecular sieves of nanoporous aluminum phosphate doped with Ce 14 or Mn 15 are generally used with oxygen as an oxidant.…”

Solvent-free oxidation of ethylbenzene over hierarchical flower-like core–shell structured Co-based mixed metal oxides with significantly enhanced catalytic performance

“…As for the oxidation of EB, some homogeneous catalysts, such as metal acetylacetonates 1 and metalloporphyrins, 10,11 give excellent activity and selectivity. 12 Despite their advantages, the problem of separation and recovery of homogenous catalysts, as well as high cost and easy deactivation, limits their large-scale practical industrial applications.…”

Low temperature vapor phase selective oxidation of ethylbenzene over Ce 1−x Mn x O 2 nanocubes

“…The oxidation of alkyl C-H bond in the aromatics into their corresponding carbonyl compounds is a significant process for the industrial manufacturing, pharmaceutical and commercial applications [3,4]. Predominantly, oxidation of ethylbenzene is an industrially important process because of the formation of acetophenone [5][6][7][8][9], those added value chemical properties make the wide applications such as a basic units in pharmaceutical products, resins, alcohols, esters, aldehydes and tear gas, and also used as the solvent for cellulose ethers [10,11]. Lewis acids have been frequently used for the oxidation of ethylbenzene [4, 12 & 13] and also some of the homogeneous catalysts were used with oxidant and various solvent, the use of such oxidants and solvents may cause the various environment issues [12].…”

“…Co, Mn, Cu, or Fe) using air as an oxidant [14,15]. The oxidation of ethylbenzene using H 2 O 2 as oxidant over 8-quinolinolato manganese (III) complexes in water-acetone medium containing ammonium acetate and acetic acid as solvents has been reported by Lu et al [5]. Zr-K-OMS-2 catalyst with TBHP as oxidant in the presence of acetonitrile solvent exhibited ethylbenzene conversion of about 60 % with 98 % of acetophenone [16], and Co/MCM-41 catalyst showed 26 % conversion with 85 % selectivity [17].…”