Thermal decomposition of pentacarbonyl iron in faujasite-type zeolite X: Quantitative and reversible formation of decomposition and recombination products

1986 ◽  
Vol 29 (1-4) ◽  
pp. 1307-1310 ◽  
Author(s):  
G. Doppler ◽  
E. Bill ◽  
U. Gonser ◽  
F. Seel ◽  
A. X. Trautwein
Keyword(s):  
Thermal Decomposition ◽  
Zeolite X ◽  
Type Zeolite ◽  
Reversible Formation

scholarly journals Silver quasi-nanoparticles: bridging the gap between clusters molecular-like and plasmonic nanoparticles

2021 ◽  
Author(s):  
Fatima Douma ◽  
Louwanda Lakiss ◽  
Oleg I. Lebedev ◽  
Julien Cardin ◽  
Krassimir L. Kostov ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Plasmonic Nanoparticles ◽  
Zeolite X ◽  
New Strategy ◽  
Type Zeolite ◽  
Optical Behavior ◽  
Silver Cations

Herein, we report a new strategy for preparing connected silver sub-nanoparticles with unique optical behavior via a selective photo-assisted electrochemical reduction of silver cations in FAU-type zeolite X (FAUX) cages....

scholarly journals Methanol electrooxidation on PtRu modified zeolite X

2013 ◽  
Vol 45 (1) ◽  
pp. 89-96 ◽  
Author(s):  
Z. Mojovic ◽  
T. Mudrinic ◽  
Abu Rabi-Stankovic ◽  
A. Ivanovic-Sasic ◽  
S. Marinovic ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Cyclic Voltammetry ◽  
Noble Metal ◽  
Metal Clusters ◽  
Supporting Electrolyte ◽  
Solid Support ◽  
Methanol Electrooxidation ◽  
Metal Acetylacetonates ◽  
Zeolite X ◽  
Scan Rate

Zeolite NaX (faujasite type) was used as a support for platinum-ruthenium catalyst. A procedure for thermal decomposition of noble metal acetylacetonates to deposit noble metal clusters on the surface of solid support was adapted by authors to introduce noble metal clusters in zeolite cavities. The effectiveness of this composite material for methanol electrooxidation from alkaline solution was investigated by cyclic voltammetry. The influence of the concentration of supporting electrolyte, scan rate and rotation rate on the reaction of methanol oxidation was investigated. The obtained activity was compared with literature data for similar catalysts.

Synthetic, Characterization and Decomposition Studies of Indium Sulfide Precursors

1995 ◽  
Vol 410 ◽  
Author(s):  
Rodney D. Schluter ◽  
Henry A. Luten ◽  
William S. Rees
Keyword(s):  
Thermal Decomposition ◽  
Coordination Number ◽  
Synthetic Methods ◽  
Indium Sulfide ◽  
Chelating Ligands ◽  
Metal Halides ◽  
Liquid Precursor ◽  
Thermogravimetric Data ◽  
Metathesis Reactions ◽  
Reversible Formation

ABSTRACTThe synthesis, characterization and decomposition of several indium thiolates containing the bulky substituted aryl ligand 2,4,6-i-Pr 3C6H2 (Ar′) or the internally chelating ligands 2-CH3O,5-CH3C6H3 (Ar″) and o-C6H4CH2N(CH3)2 (Ar"‘) are described. Two synthetic methods have been utilized: metathesis reactions between lithium thiolates and the appropriate metal halides and the addition of elemental metal to diaryl disulfides. The thermal decomposition of each indium precursor results in the formation of 1n2S3, based on thermogravimetric data. The homoleptic compound In(SAr′)3 can be isolated as a yellow oil. This liquid precursor has been derivatized by the reversible formation of acetonitrile and tetrahydrofuran adducts. Although, the molecule exists as a monomer in both adducts, the coordination number of the metal and he orientation of the ligands are markedly different. The internally chelating In(SAr″)3 and In(SAr.″′)3 adopt contrasting dimeric and monomeric structures respectively.

scholarly journals Crystallization pathway from highly viscous colloidal suspension to ultra-small FAU zeolite nanocrystals

2021 ◽  
Author(s):  
Hussein Awala ◽  
Shrikant Kunjir ◽  
Aurelie Vicente ◽  
Jean-Pierre Gilson ◽  
Valentin Valtchev ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Crystallization Kinetics ◽  
Colloidal Suspension ◽  
Zeolite X ◽  
Fau Zeolite ◽  
Type Zeolite ◽  
Template Free ◽  
Kinetics Of

The crystallization kinetics of template free ultra-small FAU-type zeolite (X) in highly alkaline viscous precursor suspensions is investigated. We focus on understanding the crystallization pathway from an ionic liquid into...

Preparation and characterization of cobalt(II) phthalocyanine complex-encapsulated zeolite-X

2015 ◽  
Vol 19 (01-03) ◽  
pp. 372-376 ◽  
Author(s):  
Nayumi Ohata ◽  
Yurie Ito ◽  
Daisuke Nakane ◽  
Hideki Kitamura ◽  
Hideki Masuda
Keyword(s):  
Elemental Analysis ◽  
Diffuse Reflectance ◽  
Synthesis Method ◽  
Spectroscopic Methods ◽  
Zeolite X ◽  
X Ray ◽  
Phthalocyanine Complex ◽  
Type Zeolite

Cobalt(II) phthalocyanine has been encapsulated into the supercage of X-type zeolite as an active monomer (CoPc-X) by the "ship-in-bottle" synthesis method, and furthermore the CoPc-X has been ion-exchanged with secondary metals ( M n+ = Na +, Ag +, Cu 2+, Zn 2+) to obtain CoPc-Mn+-X. They have been characterized by elemental analysis, fluorescent X-ray, UV-vis, diffuse reflectance, physisorption analysis, and ESR spectroscopic methods, and their deodorant behaviors for smell gasses, 2-nonenal and indole, have been examined.

Applications of Photoelectron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 506-507
Author(s):  
William J. Baxter
Keyword(s):  
Electron Microscopy ◽  
Thermal Decomposition ◽  
Chemical Composition ◽  
Ultraviolet Radiation ◽  
Thin Layer ◽  
Edge Effects ◽  
Electron Optics ◽  
Surface Layers ◽  
Crystalline Orientation ◽  
Fluorescent Screen

In this form of electron microscopy, photoelectrons emitted from a metal by ultraviolet radiation are accelerated and imaged onto a fluorescent screen by conventional electron optics. image contrast is determined by spatial variations in the intensity of the photoemission. The dominant source of contrast is due to changes in the photoelectric work function, between surfaces of different crystalline orientation, or different chemical composition. Topographical variations produce a relatively weak contrast due to shadowing and edge effects.Since the photoelectrons originate from the surface layers (e.g. ∼5-10 nm for metals), photoelectron microscopy is surface sensitive. Thus to see the microstructure of a metal the thin layer (∼3 nm) of surface oxide must be removed, either by ion bombardment or by thermal decomposition in the vacuum of the microscope.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

Observations of the Thermal Decomposition of Brucite

1968 ◽  
Vol 26 ◽  
pp. 446-447
Author(s):  
P. L. Burnett ◽  
W. R. Mitchell ◽  
C. L. Houck
Keyword(s):  
Thermal Decomposition ◽  
Magnesium Oxide ◽  
Basal Plane ◽  
Magnesium Ions ◽  
A Value ◽  
Reaction Proceeds

Natural Brucite (Mg(OH)2) decomposes on heating to form magnesium oxide (MgO) having its cubic ﹛110﹜ and ﹛111﹜ planes respectively parallel to the prism and basal planes of the hexagonal brucite lattice. Although the crystal-lographic relation between the parent brucite crystal and the resulting mag-nesium oxide crystallites is well known, the exact mechanism by which the reaction proceeds is still a matter of controversy. Goodman described the decomposition as an initial shrinkage in the brucite basal plane allowing magnesium ions to shift their original sites to the required magnesium oxide positions followed by a collapse of the planes along the original <0001> direction of the brucite crystal. He noted that the (110) diffraction spots of brucite immediately shifted to the positions required for the (220) reflections of magnesium oxide. Gordon observed separate diffraction spots for the (110) brucite and (220) magnesium oxide planes. The positions of the (110) and (100) brucite never changed but only diminished in intensity while the (220) planes of magnesium shifted from a value larger than the listed ASTM d spacing to the predicted value as the decomposition progressed.

A magnetic super lattice

1987 ◽  
Vol 45 ◽  
pp. 360-361 ◽  
Author(s):  
M.D. Bentzon ◽  
J. v. Wonterghem ◽  
A. Thölén
Keyword(s):  
Thermal Decomposition ◽  
Oleic Acid ◽  
Magnetic Fluid ◽  
Magnetic Particles ◽  
Carbon Film ◽  
Thick Layer ◽  
Amorphous Iron ◽  
Super Lattice ◽  
Carrier Liquid ◽  
Median Diameter

We report on the oxidation of a magnetic fluid. The oxidation results in magnetic super lattice crystals. The “atoms” are hematite (α-Fe2O3) particles with a diameter ø = 6.9 nm and they are covered with a 1-2 nm thick layer of surfactant molecules.Magnetic fluids are homogeneous suspensions of small magnetic particles in a carrier liquid. To prevent agglomeration, the particles are coated with surfactant molecules. The magnetic fluid studied in this work was produced by thermal decomposition of Fe(CO)5 in Declin (carrier liquid) in the presence of oleic acid (surfactant). The magnetic particles consist of an amorphous iron-carbon alloy. For TEM investigation a droplet of the fluid was added to benzine and a carbon film on a copper net was immersed. When exposed to air the sample starts burning. The oxidation and electron irradiation transform the magnetic particles into hematite (α-Fe2O3) particles with a median diameter ø = 6.9 nm.

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