Search results for "Bixbyite"

showing 2 items of 2 documents

Structure and the metal-support interaction of the Au/Mn oxide catalysts

2010

Gold catalysts with loading 1 and 10 wt % were-prepared by deposition precipitation method with urea over mesoporous manganese oxide, obtained through a surfactant-assisted procedure by using cetyltrimethylammonium bromide (CTAB), followed by treatment with sulphuric acid. For comparison, Au(10 wt %) was also deposited over commercial CeO2 and SiO2 supports. The materials were characterized by XRD and EXAFS at the Mn K and Au L-III edges and XPS. Moreover, the analyses were performed on the samples treated under 1%CO/He, at 250 degrees C for 90 min. The structural and surface results of the as prepared manganese oxide confirmed the formation of gamma-MnO2 along with some amorphous Mn3O4 upo…

Materials scienceGeneral Chemical EngineeringInorganic chemistryTEMPERATURE CO OXIDATIONOxideBixbyiteAEROBIC ALCOHOL OXIDATIONCatalysisMetalENHANCED ACTIVITYchemistry.chemical_compoundX-ray photoelectron spectroscopyBromideMANGANESE OXIDERAY-ABSORPTION SPECTROSCOPYBODY DISTRIBUTION-FUNCTIONSMaterials ChemistryCONDENSED MATTERCERIAGeneral ChemistryTEMPERATURE CO OXIDATION; RAY-ABSORPTION SPECTROSCOPY; BODY DISTRIBUTION-FUNCTIONS; AEROBIC ALCOHOL OXIDATION; GOLD NANOPARTICLES; NANOCRYSTALLINE CEO2; ENHANCED ACTIVITY; CONDENSED MATTER; MANGANESE OXIDE; CERIAchemistryvisual_artGOLD NANOPARTICLESNANOCRYSTALLINE CEO2visual_art.visual_art_mediumMesoporous materialHausmannite
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Exomorphism of jacobsite precipitates in bixbyite single crystals from the Thomas Range in Utah

2021

Abstract Naturally occurring single crystals of bixbyite, (Fe,Mn)2O3, from the Thomas Mountain Range in Utah, U.S.A., were studied via (scanning) transmission electron microscopy (S)TEM. With up to 5 cm edge length, these mineral specimens are the largest bixbyite crystals found worldwide. Their hexahedral shapes are often modified by {211} facets at the corners and small {211} truncations along their cube edges. Characteristic lamellar defects, running parallel to the {100} planes, can be observed via TEM imaging. The defects are, according to EDS analyses, attributed to the tetragonal manganese silicate braunite, Mn7[SiO12]. In the present study, electron nano-diffraction and atomic resol…

010302 applied physicsRange (particle radiation)Materials scienceAnalytical chemistry02 engineering and technologyengineering.material021001 nanoscience & nanotechnologyBixbyite01 natural sciencesGeophysicsGeochemistry and PetrologyJacobsite0103 physical sciencesengineering0210 nano-technologyAmerican Mineralogist
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