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Showing 1 to 20 of 70 for “"manganese oxide"”.
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Ozone Decomposition and Acetone Oxidation on Manganese Oxide Catalysts
… the preparation and characterization of manganese oxide catalysts and their application in the oxidation of acetone, a typical volatile organic compound (VOC), and ozone decomposition. This topic is of great value because of environmental concerns of the elimination of the harmful VOCs …
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VOC Catalytic Oxidation on Manganese Oxide Catalysts Using Ozone
… large volume gas emissions. Silica-supported manganese oxide catalysts with loadings of 3, 10, 15, and 20 wt. % (as MnO2) were characterized using x-ray absorption spectroscopy and x-ray diffraction (XRD). The edge positions in the x-ray absorption spectra indicated that the oxidation state …
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Manganese oxide deposits in water treatment facilities, North East Scotland.
… investigation was to examine the deposition of manganese oxides in water treatment facilities. To facilitate this work, suitable sources of manganese oxide were located in water treatment plants throughout the Grampian region of Scotland. These oxides provided an ideal and abundant media on …
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Structure and Ozone Decomposition Reactivity of Supported Manganese Oxide Catalysts
Manganese oxide catalysts supported on Al₂O₃, ZrO₂, TiO₂ and SiO₂ supports were used to study the effect of support on ozone decomposition kinetics. X-ray diffraction (XRD), in-situ laser Raman spectroscopy, temperature programmed oxygen desorption, surface area measurements, extended and near edge …
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Stability of lithium aluminum manganese oxide cathodes for rechargeable lithium batteries
Lithium manganese oxides have attracted wide attention as low-cost, nontoxic intercalation cathode materials for rechargeable lithium batteries. In this work, the stability of these compounds during synthesis and in use has been studied in several respects. (1) Phase stability of LiMnO2 polymorphs …
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Application of manganese oxide minerals to treat acidic waters contaminated with vanadium
… for selective recovery. This thesis investigated manganese(III/IV) oxides (MnOx) as sustainable, reuseable sorbents for V removal from acidic aqueous systems, combining mechanistic analysis with validation in real industrial wastewater. A systematic comparison of natural, commercial, synthetic, …
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MANGANESE OXIDE AS A NEW CATHODE CATALYST IN MICROBIAL FUEL CELLS (MFCs)
This study focused on manganese oxides with a cryptomelane-type octahedral molecular sieve (OMS-2) structure to replace platinum as a cathode catalyst in microbial fuel cells (MFCs). Undoped (ud-OSM-2) and three catalysts doped with cobalt (Co-OMS-2), copper (Cu-OMS-2), and cerium (Ce-OMS-2) to …
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Recovery and regeneration of lithium manganese oxide from spent lithium-ion batteries
… a method for recovering and regenerating Lithium Manganese Oxide (LMO) from spent Lithium-polymer batteries in order to recycle it in an environmentally friendly way. Two different processes for separating LMO were developed and the environmental impact of the two processes was analyzed. A process …
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Phase Transformations in Lanthanide Calcium Manganese Oxide: Charge Ordering and Phase Competition
Charge ordering (CO) phase transformations in La1-xCa xMnO3 were studied at Ca doping levels x = 0.33, 0.50, 0.67, 0.75 and 0.77. Temperature-controlled in-situ electron diffraction and high resolution dark field images were carried out to investigate the phase competitions between CO and other …
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Synthesis and characterization of lithium-manganese-oxide electrodes for lithium battery applications
… the inexpensive and environmentally friendly manganese dioxide, Li/MnO₂ batteries are being used extensively for powering a range of devices, but particular electronic systems.
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Commercialization of cryptomelane-type manganese oxide (OMS-2) nanowire paper oil sorbent
Cryptomelane-type Manganese oxide (OMS-2, a group of Octahedral Molecular Sieves) nanowire paper exhibits interesting properties: reversible wettability, oleophilic while being hydrophobic, and high thermal stability. These properties open up possible markets for commercialization. This thesis …
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Kinetics and Mechanism of Ozone Decomposition and Oxidation of Ethanol on Manganese Oxide Catalysts
… Two cases involving ozone reactions on manganese oxide catalysts were treated. Manganese oxide was chosen because it is the most active of the transition metal oxides for ozone decomposition and because it is a well-known catalyst for complete oxidation reactions. The first case studied …
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New insights into the marine oxygen cycle from manganese oxide minerals and reactive oxygen species
… intermediate redox states including hydrogen peroxide and superoxide, has profound impact on the availability and distribution of dissolved O2, the habitability of the marine biosphere, and cellular metabolic and physiological reactions that utilize O2. The sum total of processes that produce, …
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Electronic transport in Lithium Nickel Manganese Oxide, a high-voltage cathode material for Lithium-Ion batteries
… However, the introduction of Lithium Nickel Manganese Oxide (LixNi1i/2Mn3/2O4, or LNMO) as a positive electrode material appears to be one of the shortest. LNMO is a high-voltage material, with a voltage of 4.7V, and thus offers a significant energy density boost without straying far outside …
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Development of manganese oxide based nanostructures by wet chemical methods for enhanced energy storage and photocatalytic applications
… chemistry, morphology, porosity and textures, manganese oxides exhibit a variety of distinct electrochemical and dye degradation applications. This work mainly comprised of development of manganese oxide nanostructures via wet chemical approaches such as electrochemical deposition and …
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Nanoscale structural/chemical characterization of manganese oxide surface layers and nanoparticles, and the associated implications for drinking water
… reduce soluble contaminants, such as soluble manganese (Mn2+), in water by oxidation and subsequent filtration. Previous studies have shown that conventional porous filter system removes Mn2+ from drinking water by developing Mn-oxides (MnOx(s)) bearing coating layers on the surface of filter …
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An investigation into the phase stability of manganese oxide using quantum Monte Carlo and insights into materials prediction in the barium-ruthenium-sulfur phase space
… of the rock salt and zincblende structures of manganese oxide using fixed node dif- fusion Monte Carlo (DMC). Manganese oxide is a correlated, antiferromagnetic material that has proven to be challenging to model from first principles across a variety of approaches. Unlike conventional density …
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Characterization of manganese oxide coated porous carbon aerogel to isolate the effects of electro-less deposition time, li+ -ion exchange, and heat treatment on ion selectivity and specific capacitance
Motivated by the growing crisis of global water scarcity, this study focuses on an up and coming desalination technique. Capacitive deionization (CDI) is a novel method based on the general concept of ion electro-sorption, with two electrodes acting as capacitors [1]. When polarized in …
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THE EFFECT OF ALTERNATING DISTRIBUTION OF TRANSITION METALS IN LAYERED MATERIALS ON OXYGEN EVOLUTION CATALYSIS
… of few-layer catalysts constructed by manganese oxide sheets with different oxidation states. We stacked low-AOS manganese oxide sheets with high-AOS manganese oxide sheets in various ordered combinations to obtain few-layer birnessite samples with non-uniform distribution of Mn(III). …
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