scholarly journals The Influence of Ceric Oxide on Phase Composition and Activity of Iron Oxide Catalysts

2012 ◽  
Vol 02 (01) ◽  
pp. 28-33
Author(s):  
Aleksandr A. Lamberov ◽  
Ekaterina V. Dementyeva ◽  
Dmitriy I. Vavilov ◽  
Olga V. Kuzmina ◽  
Rinat R. Gilmullin ◽  
...  
Keyword(s):  
Phase Composition ◽  
Iron Oxide ◽  
Oxide Catalysts ◽  
Ceric Oxide

scholarly journals Influence of Phase Composition and Pretreatment on the Conversion of Iron Oxides into Iron Carbides in Syngas Atmospheres

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 773
Author(s):  
Aleks Arinchtein ◽  
Meng-Yang Ye ◽  
Michael Geske ◽  
Marvin Frisch ◽  
Ralph Kraehnert
Keyword(s):  
Phase Composition ◽  
Iron Oxide ◽  
Self Assembly ◽  
Iron Carbide ◽  
Active Phase ◽  
Physicochemical Analysis ◽  
Carbide Formation ◽  
Iron Carbides ◽  
Carbide Phases ◽  
Higher Hydrocarbons

CO2 Fischer–Tropsch synthesis (CO2–FTS) is a promising technology enabling conversion of CO2 into valuable chemical feedstocks via hydrogenation. Iron–based CO2–FTS catalysts are known for their high activities and selectivities towards the formation of higher hydrocarbons. Importantly, iron carbides are the presumed active phase strongly associated with the formation of higher hydrocarbons. Yet, many factors such as reaction temperature, atmosphere, and pressure can lead to complex transformations between different oxide and/or carbide phases, which, in turn, alter selectivity. Thus, understanding the mechanism and kinetics of carbide formation remains challenging. We propose model–type iron oxide films of controlled nanostructure and phase composition as model materials to study carbide formation in syngas atmospheres. In the present work, different iron oxide precursor films with controlled phase composition (hematite, ferrihydrite, maghemite, maghemite/magnetite) and ordered mesoporosity are synthesized using the evaporation–induced self–assembly (EISA) approach. The model materials are then exposed to a controlled atmosphere of CO/H2 at 300 °C. Physicochemical analysis of the treated materials indicates that all oxides convert into carbides with a core–shell structure. The structure appears to consist of crystalline carbide cores surrounded by a partially oxidized carbide shell of low crystallinity. Larger crystallites in the original iron oxide result in larger carbide cores. The presented simple route for the synthesis and analysis of soft–templated iron carbide films will enable the elucidation of the dynamics of the oxide to carbide transformation in future work.

Microstructural comparison of calcined and uncalcined gold/iron-oxide catalysts for low-temperature CO oxidation

2002 ◽  
Vol 72 (1-2) ◽  
pp. 133-144 ◽  
Author(s):  
N.A Hodge ◽  
C.J Kiely ◽  
R Whyman ◽  
M.R.H Siddiqui ◽  
G.J Hutchings ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Low Temperature ◽  
Co Oxidation ◽  
Oxide Catalysts ◽  
Low Temperature Co Oxidation

scholarly journals Recent Advances on Drawing Technology of Ultra-Fine Steel Tire Cord and Steel Saw Wire

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1590
Author(s):  
Changyong Chen ◽  
Meng Sun ◽  
Bao Wang ◽  
Jianan Zhou ◽  
Zhouhua Jiang
Keyword(s):  
Phase Composition ◽  
Iron Oxide ◽  
Oxide Scale ◽  
Steel Wire ◽  
Pearlitic Steel ◽  
Research Progress ◽  
Tire Cord ◽  
Wire Rod ◽  
Surface Iron ◽  
The Wire

Steel tire cord and steel saw wire represent typical precision pearlitic steel wire rods of wire products; it is a very important solar energy material with a diameter about 50 μm. This paper mainly discusses the research progress of the wire rod drawing process, and its main contents are as follows: First section—the control of the wire rod surface quality is summarized, including the thickness of the surface decarburization layer, the phase composition and thickness of the surface iron oxide scale, and the removal of surface iron oxide scale. Then, the research progress of the wire rod water bath treatment process during sorbitization is summarized. In addition, the development of brass plating technology for steel wire is summarized, including copper plating technology, coating phase composition, etc. Furthermore, the development of steel wire drawing methods is summarized. Finally, the development of the dies used in steel wire drawings is summarized.

Correlation between phase composition and activity of complex oxide catalysts

2011 ◽  
Vol 84 (3) ◽  
pp. 372-376 ◽  
Author(s):  
A. A. Ostroushko ◽  
O. V. Russkikh ◽  
A. V. Porsin ◽  
S. V. Pivchenko
Keyword(s):  
Phase Composition ◽  
Complex Oxide ◽  
Oxide Catalysts

Selective oxidation of hydrogen sulfide to elemental sulfur using iron oxide catalysts on various supports

1993 ◽  
Vol 17 (1-2) ◽  
pp. 217-224 ◽  
Author(s):  
R.J.A.M. Terörde ◽  
P.J. van den Brink ◽  
L.M. Visser ◽  
A.J. van Dillen ◽  
J.W. Geus
Keyword(s):  
Hydrogen Sulfide ◽  
Iron Oxide ◽  
Selective Oxidation ◽  
Elemental Sulfur ◽  
Oxide Catalysts ◽  
Oxidation Of Hydrogen

Catalytic decomposition of biomass tars with iron oxide catalysts

Fuel ◽  
2008 ◽  
Vol 87 (4-5) ◽  
pp. 451-459 ◽  
Author(s):  
M AZHARUDDIN ◽  
H TSUDA ◽  
S WU ◽  
E SASAOKA
Keyword(s):  
Iron Oxide ◽  
Catalytic Decomposition ◽  
Oxide Catalysts

scholarly journals Synthesis and Sorption Properties towards Sr-90 of Composite Sorbents Based on Magnetite and Hematite

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1189 ◽  
Author(s):  
Andrei Egorin ◽  
Eduard Tokar ◽  
Anastasia Kalashnikova ◽  
Tatiana Sokolnitskaya ◽  
Ivan Tkachenko ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Phase Composition ◽  
Iron Oxide ◽  
Polymer Matrix ◽  
Iron Content ◽  
Alkaline Media ◽  
Composite Sorbent ◽  
Dynamic Sorption ◽  
Composite Sorbents ◽  
Sorption Characteristics

The article describes the synthesis of composite sorbents by immobilizing iron oxide in a polymer matrix with subsequent hydrothermal treatment at a temperature of 175 °C. The sorbents based on magnetite and hematite were synthesized, their magnetic properties and phase composition were evaluated, and the iron content was determined. Sorption characteristics of the composites towards microconcentrations of Sr-90 radionuclide in solutions with different mineralization and pH were investigated. It was shown that the sorbent based on magnetite was the most efficient. In alkaline media with pH above 11, the composite sorbent based on magnetite exhibited increased selectivity towards Sr-90 and proved to be suitable for application under dynamic sorption conditions with subsequent desorption of the radionuclide with a solution of HNO3.

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