Synthesis of FeCoMnAPO-5 Molecular Sieve and Catalytic Activity in Cyclohexane Oxidation by Oxygen

Abstract

A new FeCoMnAPO-5 with AFI structure was synthesized under hydrothermal conditions and characterized by XRD, FT-IR, X-ray fluorescence, nitrogen adsorption and SEM. The oxidation of cyclohexane with molecular oxygen was studied over the catalyst at 403 K. It show d higher activity compared to FeAPO-5, CoAPO-5 and MnAPO-5. The FeCoMnAPO-5 catalyst was recycled twice without loss of activity or selectivity.

Preparation and Catalytic Performance of Al2O3, TiO2 and SiO2 Supported Vanadium Based-Catalysts for C–H Activation

“…4% conversion and 70-85% selectivity at 150°C under 1-2 MPa pressure [15]. Many attempts have been made to improve or substitute the classical process by developing heterogeneous catalysts with oxygen or peroxides as nonpolluting oxidants under mild conditions [2,5,[10][11][12][13][14][15]. The most interesting applied processes using oxidants such as hydrogen peroxide, tertbutyl hydroperoxide (t-BHP) and molecular oxygen are listed in Table 5.…”

“…Selective oxidation of cyclohexane to cyclohexanol and cyclohexanone using air/O 2 or other oxidants is the topic of many recent studies [2,5,[10][11][12][13][14][15]. These two major products are important intermediates in the manufacturing of nylon-6 and nylon-6,6 polymers and other products [15].…”

Catalytic oxidation of cyclohexane to cyclohexanol and cyclohexanone over Co3O4 nanocrystals with molecular oxygen

“…On the other hand, Co 3 O 4 nanocrystals showed obviously higher conversion as compared to Co 3 O 4 prepared by the conventional method or Co 3 O 4 / Al 2 O 3 under same reaction conditions. For example, Catalyst 1 exhibited the best performance, with a cyclohexane conversion of 7.6%, 89.1% selectivity, and a yield of 6.7% to K/A oil, which was higher than those obtained using metal substituted AlPO-n, or MCM-41 as catalyst [6][7][8]27]. Addition of TBHP, which acts as a free-radical initiator, decreased the induction period and the conversion was increased (entries 2 and 5).…”

“…Increasing environmental concerns in recent years, as well as great demands for these products call for a more effective catalytic process using environmentally friendly oxidant, such as molecular oxygen [3,4]. Catalysts, such as TS-1, Ti-MCM-41, and metal containing aluminophosphate molecular sieve, have been employed for the cyclohexane oxidation, using molecular oxygen as oxidant [5][6][7][8]. MnAPO-36 was found to be the most active one, and 13% conversion of cyclohexane and 62% selectivity to K/A oil were obtained at 403 K for 24 h under 1.5 MPa air pressure [9].…”

Oxidation of cyclohexane—A significant impact of stainless steel reactor wall

“…The increased environmental concerns call for benign oxidations including recoverable catalyst, solvent-free and clean oxidant like oxygen. Oxidation using molecular oxygen is more attractive because it is inexpensive, readily available and environmentally benign compared with other oxidants [2][3][4]. Cyclohexane oxidation is generally catalyzed by soluble metal salts or complexes industrially at temperature above 423 K, in which the total conversion of cyclohexane is lower than 4% and the selectivity of cyclohexanol and cyclohexanone reaches about 70-85% [5].…”