Water Oxidation Catalysis using Amorphous Manganese Oxides, Octahedral Molecular Sieves (OMS-2), and Octahedral Layered (OL-1) Manganese Oxide Structures

Iyer, A. N.; Del-Pilar, Joselyn; King’ondu, Cecil K.; Kissel, Edward; Garcés, Hector F.; Huang, Hui; El-Sawy, Abdelhamid M.; Dutta, Prabir K.; Suib, Steven L.

doi:10.1021/jp2120737

Cited by 278 publications

(258 citation statements)

References 51 publications

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“…[36,37]. The Raman spectra of bulk-doped manganese catalysts depict characteristic peaks of the nanostructured phases [38], confirming the XRD results. Diffraction patterns obtained for iron-based samples are shown in Fig.…”

Section: Reactivity Testssupporting

confidence: 80%

How to Efficiently Promote Transition Metal Oxides by Alkali Towards Catalytic Soot Oxidation

et al. 2016

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The effect of surface and bulk potassium promotion on the transition metal oxides (Mn, Fe, Co) catalytic activity in catalytic soot oxidation was investigated. The surface promotion was obtained via incipient wetness impregnation, whereas the bulk promotion-nanostructuration-was obtained via wet chemical synthesis or solid state reaction leading to mixed oxide materials. The introduction of potassium into the transition metal oxide matrix results in the formation of tunneled or layered structures, which enable high potassium mobility. The structure of the obtained materials was verified by powder X-ray diffraction and Raman spectroscopy and the catalytic activity in soot oxidation was determined by TPO-QMS and TGA. It was found that the surface promotion does not alter the metal oxide structure and leads to either enhancement (Mn, Fe) or deterioration (Co) of the catalytic activity. Simultaneously, the catalytic activity in soot combustion of the potassium structured oxides is strongly enhanced. The most active, cobalt oxide based catalyst significantly lowers the temperature of 50 % of soot conversion by *350°C comparing to the non-catalyzed process. The study allows for the establishment of rational guidelines for designing robust materials for DPF applications based on ternary metal oxides.

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Section: Reactivity Testssupporting

confidence: 80%

How to Efficiently Promote Transition Metal Oxides by Alkali Towards Catalytic Soot Oxidation

et al. 2016

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“…All chemicals were used as received and used without further purification. Manganese oxides OMS-2 and amorphous manganese oxides were synthesized by methods reported in the literature 33,34 .…”

Section: Discussionmentioning

confidence: 99%

A general approach to crystalline and monomodal pore size mesoporous materials

et al. 2013

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Mesoporous oxides attract a great deal of interest in many fields, including energy, catalysis and separation, because of their tunable structural properties such as surface area, pore volume and size, and nanocrystalline walls. Here we report thermally stable, crystalline, thermally controlled monomodal pore size mesoporous materials. Generation of such materials involves the use of inverse micelles, elimination of solvent effects, minimizing the effect of water content and controlling the condensation of inorganic frameworks by NO x decomposition. Nanosize particles are formed in inverse micelles and are randomly packed to a mesoporous structure. The mesopores are created by interconnected intraparticle voids and can be tuned from 1.2 to 25 nm by controlling the nanoparticle size. Such phenomena allow the preparation of multiple phases of the same metal oxide and syntheses of materials having compositions throughout much of the periodic table, with different structures and thermal stabilities as high as 800°C.

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“…The Mn 3 O 4 spectra showed six visible bands: 175, 289, 318, 374, 477, and 658 cm -1 [41]. Bands at 186, 285, 393, 479, 514, 582, 639 and 750 cm -1 were visible on the cryptomelane spectra [42]. On the birnessite spectra, bands at 280, 409, 477, 506, 577, 634 and 728 cm -1 are present.…”

Section: Characterizationmentioning

confidence: 95%

Strong Enhancement of deSoot Activity of Transition Metal Oxides by Alkali Doping: Additive Effects of Potassium and Nitric Oxide

et al. 2016

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A series of potassium-promoted spinels (Mn, Fe, Co) were prepared with various K ? promoter locations: on the surface (surface promotion) or in the bulk (formation of new layered and tunneled nanostructures via solid state reaction). All prepared samples were characterized by means of X-ray diffraction, Raman spectroscopy, X-ray fluorescence and N 2 -BET specific surface area analysis. Catalytic activity in soot combustion in different reaction conditions was investigated (tight contact, loose contact, loose contact with NO addition). It was shown that in all cases the nanostructuration is more effective than the surface promotion, with the layered structures of KCo 4 O 8 , KMn 4 O 8 being the most catalytically active phases, lowering the soot combustion down to 250°C. The difference in activity between tight and loose contacts can be bridged in the presence of NO due to its transformation into NO 2 , which acts as the oxygen carrier from the catalyst surface into soot particles, eliminating the soot-catalyst contact difference.

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Water Oxidation Catalysis using Amorphous Manganese Oxides, Octahedral Molecular Sieves (OMS-2), and Octahedral Layered (OL-1) Manganese Oxide Structures

Cited by 278 publications

References 51 publications

How to Efficiently Promote Transition Metal Oxides by Alkali Towards Catalytic Soot Oxidation

How to Efficiently Promote Transition Metal Oxides by Alkali Towards Catalytic Soot Oxidation

A general approach to crystalline and monomodal pore size mesoporous materials

Strong Enhancement of deSoot Activity of Transition Metal Oxides by Alkali Doping: Additive Effects of Potassium and Nitric Oxide

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