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Preferential dissolution of copper from Cu-Mn oxides in strong acid medium : effect of the starting binary oxide to get new efficient copper doped MnO2 catalysts in toluene oxidation Universiteit Gent
This work investigated the concept of preferential dissolution of copper in HNO3 10 M at 20 °C from two starting Cu-Mn oxides to acquire novel copper doped MnO2 like polymorphs. On purpose two starting Cu-Mn oxides were tested: a nanocristalline CuMn2O4 spinel phase with a SSA of 47 m2/g and a weak amorphous Cu-Mn oxide with a Mn/Cu atomic ratio of 4.8 (SSA: 166 m2/g). The physico-chemical properties of the final copper doped MnO2 like oxides ...
Electrical Characterization of Functional Oxides for Resistive RAM Memory Applications (Elektrische karakterisatie van functionele oxiden voor resistieve RAM applicaties) KU Leuven
This Ph.D study mainly focuses on transition metal oxide based filamentary resistive random access memory (RRAM) technology, as to screen out a stable switching material stack, assess its scalability and characterize its reliability at scaled dimension. A reliable switching system HfO2 / Hf in scaled dimension was successfully demonstrated, and its technology feasibility of NAND replacement or other types of application was evaluated. Detailed ...
Compatibility issues of yttria-stabilized zirconia solid oxide membrane in the direct electro-deoxidation of metal oxides KU Leuven
Direct electro‐deoxidation of metal oxides has become quite popular in the production of metals and alloys. In this process, metal oxide cathode is directly reduced to a metal in a molten CaCl2 salt bath. The anode material used is graphite. Over the years, graphite is reported to cause numerous process difficulties. Recently, based on the solid oxide membrane technology, yttria‐stabilized zirconia (YSZ) has been tested as oxygen ion conducting ...
Enhanced Separation Performance for CO2 Gas of Mixed-Matrix Membranes Incorporated with TiO2/Graphene Oxide: Synergistic Effect of Graphene Oxide and Small TiO2 Particles on Gas Permeability of Membranes KU Leuven
© 2017 American Chemical Society. This study combines the adsorption layer nanoreactor synthesis (ALRS) method with in situ polymerization to prepare high-performance separation hybrid membranes containing TiO 2 -graphene oxide (TiO 2 -GO). TiO 2 nanoparticles were initially generated on the GO surface through ALRS. Hybrid membranes containing A-TiO 2 -GO were then prepared using in situ polymerization. The inhibition of aggregation by the ...
Enhanced Performance of Polyurethane Hybrid Membranes for CO2 Separation by Incorporating Graphene Oxide: The Relationship between Membrane Performance and Morphology of Graphene Oxide KU Leuven
Polyurethane hybrid membranes containing graphene oxide (GO) with different morphologies were prepared by in situ polymerization. The separation of CO2/N2 gas mixtures was studied using these novel membranes. The results from the morphology characterization of GO samples indicated that the oxidation process in the improved Hummers method introduced oxygenated functional groups into graphite, making graphite powder exfoliate into GO nanosheets. ...
Reactivity of NCN-Chelated (NCN = C6H3-2,6-(CH2NMe2)(2)) Antimony(III) and Bismuth(III) Oxides toward Oxides of Arsenic. Vrije Universiteit Brussel
Reactivity of NCN-Chelated (NCN = C6H3-2,6-(CH2NMe2)(2)) Antimony(III) and Bismuth(III) Oxides toward Oxides of Arsenic.
Theory of surface chemistry and reactivity of reducible oxides Vrije Universiteit Brussel
The increasing availability of computational data from quantum-chemical calculations on the reactivity and electronic structure of catalytically active oxidic systems make a revisitation of the classical questions on chemical bonding aspects of catalytically reactive systems useful. This Perspective paper starts with a short review of the different available systems. The elementary reactions that are part of the selective oxidation catalysis, ...
Layered manganese oxides structures : micro‐Raman and selected mobile Raman spectroscopic studies Universiteit Gent
The main structural building blocks that form manganese oxides are MnO6 octahedra; these share corners and edges to construct specific structures, which can either be tunneled or layered. In the layered structures, that is, phyllomanganates, the MnO6 octahedra form sheets, which, in turn, alternate with sheets of metal oxides and H2O. These metal ions can vary (Zn, Co, Ni, Al, Li, horizontal ellipsis ) and give rise to an entire range of ...