Highly dispersed iron oxides on mesoporous carbon for selective oxidation of benzyl alcohol with molecular oxygen

Geng, Longlong; Zhang, Xiuyan; Zhang, Wenxiang; Jia, Mingjun; Liu, Gang

doi:10.1039/c3cc47332e

Cited by 50 publications

(28 citation statements)

References 30 publications

(3 reference statements)

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“…The catalytic performance of Fe 3 O 4 /C was tested in the selective oxidation of benzyl alcohol with air as the oxidant source (Figure ). Fe 3 O 4 /C exhibits 93.6 % conversion of benzyl alcohol after 8 h of reaction, which is comparable with that of supported ultrafine iron oxide particles (<2 nm) reported previously and much higher than that of supported 5–10 nm α‐Fe 2 O 3 . The selectivity to benzaldehyde is nearly 100 %.…”

Section: Resultsmentioning

confidence: 95%

“…Few of them are catalytically active under mild reaction conditions . Very recently, we reported that ultrafine iron oxide species (<2 nm) supported on carbon be active in the selective oxidation of benzyl alcohol with air as the oxygen source . This catalyst could work at low reaction temperatures (40–80 °C) and ambient pressure (1 atm) .…”

Section: Introductionmentioning

confidence: 99%

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Fe₃O₄ Nanoparticles Anchored on Carbon Serve the Dual Role of Catalyst and Magnetically Recoverable Entity in the Aerobic Oxidation of Alcohols

et al. 2016

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A composite of Fe3O4 nanoparticles anchored on a carbon support (Fe3O4/C), possessing both superparamagnetism and molecular oxygen activating properties, was prepared by an ammonia‐assisted precipitation method. Fe3O4/C could catalyze the selective oxidation of various benzyl alcohols with air as the oxidant source, and could be easily separated and recycled with an external magnet. The small particle size and the interaction between the Fe3O4 nanoparticles and carbon support endow the Fe3O4/C catalyst with relatively high reducibility. Its oxidation state is easy to change. This intrinsic property of the Fe3O4 nanoparticles could be responsible for the high activity of Fe3O4/C in the aerobic oxidation of alcohols.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Fe₃O₄ Nanoparticles Anchored on Carbon Serve the Dual Role of Catalyst and Magnetically Recoverable Entity in the Aerobic Oxidation of Alcohols

et al. 2016

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“…145,146 Schüth and co-workers successfully synthesized γ- 147 Black carbon-silica composites were obtained via a hard template approach. The key point in the synthetic procedure is to impregnate the Fe precursor into the carbon-silica composites, instead of the prepared CMK-5.…”

Section: Mesoporous Carbonmentioning

confidence: 99%

Recent Advances on the Design of Group VIII Base-Metal Catalysts with Encapsulated Structures

et al. 2015

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Inexpensive group VIII metal (i.e., Fe, Co, and Ni)-based solid catalysts have been widely used in various energy transformation processes such as Fisher-Tropsch (F-T) synthesis, reforming and water-gas shift reactions. The emerging encapsulation strategy, which represents active metal species are coated by protective shell or matrix, has been demonstrated as a powerful means to promote the catalytic performance (i.e., activity, stability and selectivity) of Fe-, Co-and Ni-based catalysts due to synergic effects from the well-defined structures. This review describes recent progress on the design and synthesis of encapsulated group VIII base-metal nanomaterials developed for energy and environmental catalysis including syngas conversion, CO 2 dry reforming, steam reforming, methane conversion and NH 3 decomposition. We start with an introduction of the catalysts with different encapsulating structures (e.g., core@shell, yolk@shell, core@tube, mesoporous structures and lamellar structures). Then, the synthetic methods of Fe-, Co-and Ni-based catalysts with encapsulated structures are described in detail. The functions of encapsulation structures in catalysis, including protecting metal nanoparticles (NPs) from sintering, promoting the activity due to the confinement effect and intensifying reaction processes in the form of multifunctional catalysts, are discussed respectively. Our perspectives regarding the challenges and opportunities for future research in the field are also provided.

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“…Noble metal [3][4][5][6] and metal oxide [7][8][9][10] catalysts are two types of materials widely used for alcohol oxidation reactions, but show drawbacks when used in practical applications. Noble metals are expensive and need to be prepared at the nanoscale to achieve the desired catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Aerobic selective oxidation of alcohols using La1−Ce CoO3 perovskite catalysts

Zhu

Zhao

Tang

et al. 2016

Journal of Catalysis

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a b s t r a c tThe synthesis of porous perovskites with high and stable activity for alcohols oxidation using molecular oxygen as oxidant is reported. La 1Àx Ce x CoO 3 catalysts are prepared by a sol-gel method using methanol and ethylene glycol as complexing agents. Calcination at 600°C allows the formation of macro-and mesopores, in contrast to similar materials that often show a bulk structure. Catalytic tests show that La 0.9 Ce 0.1 CoO 3 is highly active for benzyl alcohol oxidation with molecular oxygen, with both conversion and selectivity above 95% (60 min, 88°C, 1 atm). Further tests show that 94% of the original activity can be obtained after surface regeneration of the used catalyst. The good catalytic performance is explained by the presence of cerium, which is able to attract and release adsorbed oxygen on the oxygen vacancies. The electrons donated by alcohols improve the ability of oxygen vacancies to activate molecular oxygen into oxygen anions, which react with the alcohol and increase the reaction rate. A mechanism is proposed.

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Highly dispersed iron oxides on mesoporous carbon for selective oxidation of benzyl alcohol with molecular oxygen

Abstract: Highly dispersed iron oxide supported catalysts, prepared using HNO3-treated CMK-3 mesoporous carbons as supports, exhibit relatively high catalytic activity in selective oxidation of benzyl alcohol with oxygen.

Cited by 50 publications

References 30 publications

Fe₃O₄ Nanoparticles Anchored on Carbon Serve the Dual Role of Catalyst and Magnetically Recoverable Entity in the Aerobic Oxidation of Alcohols

Fe₃O₄ Nanoparticles Anchored on Carbon Serve the Dual Role of Catalyst and Magnetically Recoverable Entity in the Aerobic Oxidation of Alcohols

Recent Advances on the Design of Group VIII Base-Metal Catalysts with Encapsulated Structures

Aerobic selective oxidation of alcohols using La1−Ce CoO3 perovskite catalysts

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Highly dispersed iron oxides on mesoporous carbon for selective oxidation of benzyl alcohol with molecular oxygen

Abstract: Highly dispersed iron oxide supported catalysts, prepared using HNO3-treated CMK-3 mesoporous carbons as supports, exhibit relatively high catalytic activity in selective oxidation of benzyl alcohol with oxygen.

Cited by 50 publications

References 30 publications

Fe3O4 Nanoparticles Anchored on Carbon Serve the Dual Role of Catalyst and Magnetically Recoverable Entity in the Aerobic Oxidation of Alcohols

Fe3O4 Nanoparticles Anchored on Carbon Serve the Dual Role of Catalyst and Magnetically Recoverable Entity in the Aerobic Oxidation of Alcohols

Recent Advances on the Design of Group VIII Base-Metal Catalysts with Encapsulated Structures

Aerobic selective oxidation of alcohols using La1−Ce CoO3 perovskite catalysts

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Product

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Fe₃O₄ Nanoparticles Anchored on Carbon Serve the Dual Role of Catalyst and Magnetically Recoverable Entity in the Aerobic Oxidation of Alcohols

Fe₃O₄ Nanoparticles Anchored on Carbon Serve the Dual Role of Catalyst and Magnetically Recoverable Entity in the Aerobic Oxidation of Alcohols