Heterogeneous Metal Catalysts for Oxidation Reactions

Ali, Eaqub; Rahman, M. M.; Sarkar, Shaheen M.; Hamid, Sharifah Bee Abd

doi:10.1155/2014/192038

Cited by 71 publications

(66 citation statements)

References 148 publications

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“…Metal ions play a privileged role as oxygenation and oxidation reagents and catalysts, largely through their ability to activate O 2 and to generate structurally intriguing metal–oxygen species that can have the ability to attack even the strongest C–H bonds. Copper ions are particularly prevalent in enzymes, 5,6 heterogeneous catalysts, 7,8 and soluble reagents 9–11 that oxidize organic molecules, and they are also involved in four-electron processes that interconvert O 2 and H 2 O. 12–14 A rich variety of mechanisms have been postulated for these systems, which may contain one or more copper ions that generate structurally diverse intermediates.…”

Section: Introductionmentioning

confidence: 99%

Copper–Oxygen Complexes Revisited: Structures, Spectroscopy, and Reactivity

et al. 2017

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A longstanding research goal has been to understand the nature and role of copper–oxygen intermediates within copper-containing enzymes and abiological catalysts. Synthetic chemistry has played a pivotal role in highlighting the viability of proposed intermediates and expanding the library of known copper–oxygen cores. In addition to the number of new complexes that have been synthesized since the previous reviews on this topic in this journal (Mirica, L. M.; Ottenwaelder, X.; Stack, T. D. P. Chem. Rev. 2004, 104, 1013–1046 and Lewis, E. A.; Tolman, W. B. Chem. Rev. 2004, 104, 1047–1076), the field has seen significant expansion in the (1) range of cores synthesized and characterized, (2) amount of mechanistic work performed, particularly in the area of organic substrate oxidation, and (3) use of computational methods for both the corroboration and prediction of proposed intermediates. The scope of this review has been limited to well-characterized examples of copper–oxygen species but seeks to provide a thorough picture of the spectroscopic characteristics and reactivity trends of the copper–oxygen cores discussed.

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Section: Introductionmentioning

confidence: 99%

Copper–Oxygen Complexes Revisited: Structures, Spectroscopy, and Reactivity

et al. 2017

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“…Fe-based solids are one of the most widely studied catalytic materials in converting hydrocarbons through oxidation reactions, owing to their promising physicochemical properties [1][2][3]. The features Reaction II is another pathway for styrene oxidation reaction leading to the formation of valuable chemical products such as 2-phenylehtnol, 2-phenyl acetic acid, 2-phenyl acetaldehyde, acetophenone, and ethylbenzene.…”

Section: Introductionmentioning

confidence: 99%

Styrene Oxidation to Valuable Compounds over Nanosized FeCo-Based Catalysts: Effect of the Third Metal Addition

et al. 2017

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Nanosized FeCo-based solids were prepared via distinct preparation procedures. The catalytic performances of the solids for styrene oxidation in the presence of hydrogen peroxide were evaluated. The addition of promoters in FeCo such as Sn, Mo, or Cu was also investigated. The catalysts were characterized with XRD, Raman spectroscopy, TEM, chemical analyses, EPR and SEM-EDS. Of these solids obtained via four different methods, the catalyst prepared via the NC and CM procedures enabled a partial incorporation of the Sn into the FeCo matrix forming a very active phase, namely the Heusler alloy. This was ascribed to the high initial dispersion of Sn as a promoter into the FeCo matrix, which led to available FeCoSn (FCS) particles well dispersed and stable on the catalyst surface. In the case of incorporating Mo or Cu to the nanosized FeCo catalyst, a poor stability towards leaching was observed when operating under the same reaction conditions. Cu was much less active than both Sn and Mo, mainly leading to acetophenone, ethylbenzene, 2-phenyl ethanol, 2-phenyl acetic acid, and 2-phenyl acetaldehyde products. The best catalytic results under the optimized reaction conditions, especially at 50 • C and styrene/H 2 O 2 molar ratio of 1 were achieved with nanosized FCS. This solid had a conversion of ca. 70% and selectivity for aldehydes of ca. 27%, and the selectivity for the condensation products was 29%.

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“…It is well-known than the traces of transition metals, particularly, iron, strongly accelerate the gasoline oxidation, catalyzing a decomposition of hydroperoxides into radical species [5][6][7][8]. Aa a result, a presence of the various metals in the automotive gasoline is undesirable.…”

Section: Resultsmentioning

confidence: 99%

Enhancement in the Oxidative Stability of Commercial Gasoline Fuel by the Goethite Nanoparticles

Kalishyn¹,

Bychko²,

Polunkin³

et al. 2019

Preprint

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It is well-established that traces of the transition metals strongly accelerate the gasoline oxidation significantly decreasing the gasoline storage time. This paper explores the opposite effect of the goethite nanoparticles on the oxidative stability of the commercial gasoline. The goethite nanoparticles were obtained in a colloidal solution by a simple thermal decomposition of iron(II) oleate. The size and the structure of the nanoparticles are confirmed by TEM, Mössbauer spectroscopy, and elemental analysis. Model study of the benzyl alcohol oxidation shows that the goethite nanoparticles significantly inhibit the oxidation process. Study of the effect of the goethite nanoparticles on the induction period of the commercial gasoline reveals a significant elongation of the induction period. It highlights that the goethite nanoparticles are capable to enhance the storage time of a gasoline. The effect may be associated with a quenching of free radicals by the goethite nanoparticles.

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Heterogeneous Metal Catalysts for Oxidation Reactions

Cited by 71 publications

References 148 publications

Copper–Oxygen Complexes Revisited: Structures, Spectroscopy, and Reactivity

Copper–Oxygen Complexes Revisited: Structures, Spectroscopy, and Reactivity

Styrene Oxidation to Valuable Compounds over Nanosized FeCo-Based Catalysts: Effect of the Third Metal Addition

Enhancement in the Oxidative Stability of Commercial Gasoline Fuel by the Goethite Nanoparticles

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