Autoxidation ofp-cresol top-hydroxy benzaldehyde using CoCl2, CoAPO-5 and CoAPO-11

Abstract

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

“…FeAPO-5, CoAPO-5 and MnAPO-5 molecular sieves have been widely studied in many kinds of reactions and show remarkable catalytic performance. For example, they have been used as catalysts for the catalytic oxidation:of cyclohexane to cyclohexanol and cyclohexanone [4]; of p-xylene to terephthalic acid; and of p-cresol to p-hydroxyl-benzaldehyde in mathanolic sodium hydroxide [5]. Also, the activity of these materials has been found for the ammoximation of cyclohexanone with ammonia and H 2 O 2 to e-caprolactam [6].…”

The Reaction of Aza Michael Catalyzed by Zeolite Cu-ZSM-5 under Solvent-Free Conditions

“…The size of the particles is an important point in catalysis. The exchange surface should be as large as possible to improve the catalysis reaction [20][21][22][23][24]. The finer the particles, the more the specific surface increases.…”

Probing Cobalt Sites in CoAPO-11 via Spectroscopic and Activity Studies

“…At the same time, results showed that Co(III) has better activity and selectivity than Co(II). It has been reported that p-cresol can be oxidized to phydroxy benzyl alcohol and eventually oxidized to p-hydroxy benzaldehyde [16]. Among many synthetic methods, liquid phase catalytic oxidation of p-cresol with molecular oxygen appears most promising [23].…”

“…Compounds like hydrotalcite have been used as catalyst to get a high p-cresol conversion. The autoxidation of p-cresol to p-hydroxy benzaldehyde by using CoCl2, CoAPO-5 and CoAPO-11 catalysts in methanolic sodium hydroxide solution were conducted [16] and observed activity is solely attributed to the cobalt species present in homogenous medium, i.e. cobalt is unstable in AlPO framework and released into reaction medium during reaction.…”

“…Many researchers [16,17] have carried out the synthesis of cobalt containing AlPO-11 by adopting different methods and evaluated the catalytic properties in various organic transformations [17]. Apart from usual techniques such as XRD, TG and FT-IR [18,19], a variety of spectroscopic methods including DRUV-VIS [19] and EPR [20] were employed to probe the location and oxidation of state of cobalt in the aluminophosphate matrix.…”