Mesoporous manganese oxides prepared by solution combustion synthesis as catalysts for the total oxidation of VOCs

Piumetti, Marco; Fino, Debora; Russo, Nunzio

doi:10.1016/j.apcatb.2014.08.012

Cited by 446 publications

(192 citation statements)

References 63 publications

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“…59,60 Brønsted acid sites are very important in oxidation catalysis, since the surface acidity, as well as the basic properties, may be responsible for the adsorption/desorption rates of reactants and products, and are a major factor in the activation of hydrocarbons and occurring intermediates. 61 The lowest intensity of OH stretching of the Brønsted acid (3258 cm −1 ) was detected for MEK oxidation on Mn 3 O 4 catalyst at 63,64 and surface carbonate species, 19 respectively. According to the results of TPSR (SI Figure S3), the band of 1586 cm −1 (CO stretching vibrations of β-diketone ligands) stemmed from diacetyl (CH 3 COCOCH 3 ), which was a common reaction intermediate in catalytic oxidation of MEK.…”

Section: Methodsmentioning

confidence: 99%

Sphere-Shaped Mn₃O₄ Catalyst with Remarkable Low-Temperature Activity for Methyl–Ethyl–Ketone Combustion

Pan

Jian

Chen

et al. 2017

Environ. Sci. Technol.

180

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Mn 3 O 4 , FeMnO x , and FeO x catalysts synthesized via a solvothermal method were employed for catalytic oxidation of methyl−ethyl−ketone (MEK) at low temperature. Mn 3 O 4 with sphere-like morphology exhibited the highest activity for MEK oxidation, over which MEK was completely oxidized to CO 2 at 200°C, and this result can be comparable to typical noble metal loaded catalysts. The activation energy of MEK over Mn 3 O 4 (30.8 kJ/mol) was much lower than that of FeMnO x (41.5 kJ/mol) and FeO x (47.8 kJ/mol). The dominant planes, surface manganese species ratio, surface-absorbed oxygen, and redox capability played important roles in the catalytic activities of catalysts, while no significant correlation was found between specific surface area and MEK removal efficiency. Mn 3 O 4 showed the highest activity, accounting for abundant oxygen vacancies, low content of surface Mn 4+ and strong reducibility. The oxidation of MEK to CO 2 via an intermediate of diacetyl is a reaction pathway on Mn 3 O 4 catalyst. Due to high efficiency and low cost, sphere-shaped Mn 3 O 4 is a promising catalyst for VOCs abatement.

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Section: Methodsmentioning

confidence: 99%

Sphere-Shaped Mn₃O₄ Catalyst with Remarkable Low-Temperature Activity for Methyl–Ethyl–Ketone Combustion

Pan

Jian

Chen

et al. 2017

Environ. Sci. Technol.

180

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“…The reaction is exothermic in nature and proceeds auto-thermally without further external heating after initiation of combustion. A detailed description of the synthesis procedure is provided elsewhere [31][32][33]35,44,47,53,[67][68][69][70][71]. The synthesized nano-powder was then sintered in air by heating at a rate of 1 • C min −1 until it reached 800 • C where it was maintained for 3 h before cooling to room temperature at a rate of 1 • C min −1 .…”

Section: Catalyst Synthesismentioning

confidence: 99%

Active and Stable Methane Oxidation Nano-Catalyst with Highly-Ionized Palladium Species Prepared by Solution Combustion Synthesis

et al. 2018

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We report on the synthesis and testing of active and stable nano-catalysts for methane oxidation. The nano-catalyst was palladium/ceria supported on alumina prepared via a one-step solution-combustion synthesis (SCS) method. As confirmed by X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HTEM), SCS preparative methodology resulted in segregating both Pd and Ce on the surface of the Al 2 O 3 support. Furthermore, HTEM showed that bigger Pd particles (5 nm and more) were surrounded by CeO 2 , resembling a core shell structure, while smaller Pd particles (1 nm and less) were not associated with CeO 2 . The intimate Pd-CeO 2 attachment resulted in insertion of Pd ions into the ceria lattice, and associated with the reduction of Ce 4+ into Ce 3+ ions; consequently, the formation of oxygen vacancies. XPS showed also that Pd had three oxidation states corresponding to Pd 0 , Pd 2+ due to PdO, and highly ionized Pd ions (Pd (2+x)+ ) which might originate from the insertion of Pd ions into the ceria lattice. The formation of intrinsic Ce 3+ ions, highly ionized (Pd 2+ species inserted into the lattice of CeO 2 ) Pd ions (Pd (2+x)+ ) and oxygen vacancies is suggested to play a major role in the unique catalytic activity. The results indicated that the Pd-SCS nano-catalysts were exceptionally more active and stable than conventional catalysts. Under similar reaction conditions, the methane combustion rate over the SCS catalyst was~18 times greater than that of conventional catalysts. Full methane conversions over the SCS catalysts occurred at around 400 • C but were not shown at all with conventional catalysts. In addition, contrary to the conventional catalysts, the SCS catalysts exhibited superior activity with no sign of deactivation in the temperature range between~400 and 800 • C.

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“…Moreover, it has several features, such as being highly active, stable, inexpensive, and ecofriendly catalyst [51][52][53][54][55][56]. However, different types of manganese oxide, mixed manganese oxide, and noble metal doped/supported Mn oxides were widely employed for the catalytic oxidation of numerous organic substrates, for instance, oxidation of naphthalene to carbon dioxide [57], oxidation of carbon monoxide to CO 2 [58,59], oxidation of toluene to CO 2 [60], oxidation of ethylene and propylene to CO 2 [61], oxidation of cyclohexane to cyclohexanol and cyclohexanone [62], oxidation of alkyl aromatics to ketones [63], oxidation of 4-tert-butyltoluene to 4-tert-butylbenzaldehyde [64], and oxidation of formaldehyde to CO 2 [65].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Relative Study on the Catalytic Activity of Zinc Oxide Nanoparticles Doped MnCO₃, –MnO₂, and –Mn₂O₃ Nanocomposites for Aerial Oxidation of Alcohols

Assal

Kuniyil

Shaik

et al. 2017

Journal of Chemistry

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Zinc oxide nanoparticles doped manganese carbonate catalysts [ % ZnO x -MnCO 3 ] (where = 0-7) were prepared via a facile and straightforward coprecipitation procedure, which upon different calcination treatments yields different manganese oxides, that is, [ % ZnO x -MnO 2 ] and [ % ZnO x -Mn 2 O 3 ]. A comparative catalytic study was conducted to evaluate the catalytic efficiency between carbonates and oxides for the selective oxidation of secondary alcohols to corresponding ketones using molecular oxygen as a green oxidizing agent without using any additives or bases. The prepared catalysts were characterized by different techniques such as SEM, EDX, XRD, TEM, TGA, BET, and FTIR spectroscopy. The 1% ZnO x -MnCO 3 calcined at 300 ∘ C exhibited the best catalytic performance and possessed highest surface area, suggesting that the calcination temperature and surface area play a significant role in the alcohol oxidation. The 1% ZnO x -MnCO 3 catalyst exhibited superior catalytic performance and selectivity in the aerial oxidation of 1-phenylethanol, where 100% alcohol conversion and more than 99% product selectivity were obtained in only 5 min with superior specific activity (48 mmol⋅g −1 ⋅h −1 ) and 390.6 turnover frequency (TOF). The specific activity obtained is the highest so far (to the best of our knowledge) compared to the catalysts already reported in the literatures used for the oxidation of 1-phenylethanol. It was found that ZnO x nanoparticles play an essential role in enhancing the catalytic efficiency for the selective oxidation of alcohols. The scope of the oxidation process is extended to different types of alcohols. A variety of primary, benzylic, aliphatic, allylic, and heteroaromatic alcohols were selectively oxidized into their corresponding carbonyls with 100% convertibility without overoxidation to the carboxylic acids under base-free conditions.

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Mesoporous manganese oxides prepared by solution combustion synthesis as catalysts for the total oxidation of VOCs

Cited by 446 publications

References 63 publications

Sphere-Shaped Mn₃O₄ Catalyst with Remarkable Low-Temperature Activity for Methyl–Ethyl–Ketone Combustion

Sphere-Shaped Mn₃O₄ Catalyst with Remarkable Low-Temperature Activity for Methyl–Ethyl–Ketone Combustion

Active and Stable Methane Oxidation Nano-Catalyst with Highly-Ionized Palladium Species Prepared by Solution Combustion Synthesis

Synthesis, Characterization, and Relative Study on the Catalytic Activity of Zinc Oxide Nanoparticles Doped MnCO₃, –MnO₂, and –Mn₂O₃ Nanocomposites for Aerial Oxidation of Alcohols

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Mesoporous manganese oxides prepared by solution combustion synthesis as catalysts for the total oxidation of VOCs

Cited by 446 publications

References 63 publications

Sphere-Shaped Mn3O4 Catalyst with Remarkable Low-Temperature Activity for Methyl–Ethyl–Ketone Combustion

Sphere-Shaped Mn3O4 Catalyst with Remarkable Low-Temperature Activity for Methyl–Ethyl–Ketone Combustion

Active and Stable Methane Oxidation Nano-Catalyst with Highly-Ionized Palladium Species Prepared by Solution Combustion Synthesis

Synthesis, Characterization, and Relative Study on the Catalytic Activity of Zinc Oxide Nanoparticles Doped MnCO3, –MnO2, and –Mn2O3 Nanocomposites for Aerial Oxidation of Alcohols

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Sphere-Shaped Mn₃O₄ Catalyst with Remarkable Low-Temperature Activity for Methyl–Ethyl–Ketone Combustion

Sphere-Shaped Mn₃O₄ Catalyst with Remarkable Low-Temperature Activity for Methyl–Ethyl–Ketone Combustion

Synthesis, Characterization, and Relative Study on the Catalytic Activity of Zinc Oxide Nanoparticles Doped MnCO₃, –MnO₂, and –Mn₂O₃ Nanocomposites for Aerial Oxidation of Alcohols