Thermal decomposition mechanism of iron(III) nitrate and characterization of intermediate products by the technique of computerized modeling

Melnikov, Petr; Arkhangelsky, I. V.; Consolo, L. Z. Zanoni; Oliveira, Lincoln Carlos Silva de

doi:10.1007/s10973-013-3339-1

Cited by 82 publications

(34 citation statements)

References 11 publications

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“…Their condensation leads to di‐, tri‐, and finally tetramers such as Fe 4 O 4 (NO 3 ) 4 . Their hydrolysis gives rise to oxynitrate Fe 4 O 4 (OH) 2 (NO 3 ) 2 ·2H 2 O . Further removal of NO x from this phase leads to the formation of hematite.…”

Section: Resultsmentioning

confidence: 99%

Carbon–Silica Composite as an Effective Support for Iron Fischer–Tropsch Synthesis Catalysts

et al. 2019

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Carbon–silica composite is prepared by the impregnation of silica with aqueous glucose solution followed by drying and calcination in an inert atmosphere. This material is proposed as a support for the potassium‐promoted iron catalysts for Fischer–Tropsch synthesis (FTS). The catalysts are prepared by incipient wetness impregnation. The reducibility of CQ‐supported iron is increased and Hägg carbide is formed in the course of activation in CO/H2 flow at 400 °C for 2 h. Subsequent exposure in FTS conditions results in the significant increase of iron carbide particles, from 3–4 to 20–30 nm, while no such increase is detected for the pure silica as support. The carbon–silica composite support provides a beneficial effect on the catalytic activity of iron in CO hydrogenation as well as the suppression of methane formation and increasing Anderson–Schulz–Flory distribution (ASF) chain growth parameter. The catalysts are characterized by nitrogen adsorption, X‐ray absorption spectroscopy (XPS), transmission electron microscopy (TEM), and in situ magnetic measurements in the course of temperature‐programmed reduction by H2 and synthesis gas.

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Section: Resultsmentioning

confidence: 99%

Carbon–Silica Composite as an Effective Support for Iron Fischer–Tropsch Synthesis Catalysts

et al. 2019

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“…Finally, the dissolution of C atoms into the Fe‐rich matrix led to the formation of Fe 3 C and Fe/Fe 3 C eutectoid, and the precipitation of C atoms resulted in the growth of graphene around Fe/Fe 3 C nanoparticles. The reaction processes can be described using (Equations –)

4 Fe {({normalNO}_{3})}_{3} \cdot 6 {normalH}_{2} O \to {2Fe}_{2} {normalO}_{3} + 12 {HNO}_{3} + 18 {normalH}_{2} O

{Fe}_{2} {normalO}_{3} + 3 CO \to 2Fe + {3CO}_{2}

{CH}_{4} \overset{Fe}{\to} C + 2 {normalH}_{2}

Fe + 3 C \to {Fe}_{3} C

…”

Section: Resultsmentioning

confidence: 99%

Ferromagnetic Nanoparticle–Assisted Polysulfide Trapping for Enhanced Lithium–Sulfur Batteries

Gao

Schwab

Zhang

et al. 2018

Adv Funct Materials

128

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The lithium-sulfur (Li-S) battery is a promising candidate for next-generation high-density energy storage devices because of its ultrahigh theoretical energy density and the natural abundance of sulfur. However, the practical performance of the sulfur cathode is plagued by fast capacity decay and poor cycle life, both of which can be attributed to the intrinsic dissolution/shuttling of lithium polysulfides. Here, a new built-in magnetic field-enhanced polysulfide trapping mechanism is discovered by introducing ferromagnetic iron/iron carbide (Fe/Fe 3 C) nanoparticles with a graphene shell (Fe/Fe 3 C/ graphene) onto a flexible activated cotton textile (ACT) fiber to prepare the ACT@Fe/Fe 3 C/graphene sulfur host. The novel trapping mechanism is demonstrated by significant differences in the diffusion behavior of polysulfides in a custom-designed liquid cell compared to a pure ACT/S cathode. Furthermore, a cell assembled using the ACT@Fe/Fe 3 C/S cathode exhibits a high initial discharge capacity of ≈764 mAh g −1 , excellent rate performance, and a remarkably long lifespan of 600 cycles using ACT@Fe/Fe 3 C/S (whereas only 100 cycles can be achieved using pure ACT/S). The new magnetic fieldenhanced trapping mechanism provides not only novel insight but unveils new possibilities for mitigating the "shuttle effect" of polysulfides thereby promoting the practical applications of Li-S batteries.

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“…[38] At higher temperature, hydrolytic processes continue with the gradual elimination of nitric acid from the resulting tetramer,a nd dimeric iron oxyhydroxide Fe 4 O 4 (OH) 4 is formed. Thermolysis begins with the successive condensation of four moles of the initial monomer accompaniedb yt he loss of four moles of nitric acid.…”

Section: Resultsmentioning

confidence: 99%

“…Thermolysis begins with the successive condensation of four moles of the initial monomer accompaniedb yt he loss of four moles of nitric acid. [38] At higher temperature, hydrolytic processes continue with the gradual elimination of nitric acid from the resulting tetramer,a nd dimeric iron oxyhydroxide Fe 4 O 4 (OH) 4 is formed. After complete dehydration, oxyhydroxide is destroyed, leaving behindt wo moles of Fe 2 O 3 .I no ur opinion, the sequence of the above processesl eads to an excesso ft he iron concentration in the surfacelayer of the catalystgranules.…”

Section: Resultsmentioning

confidence: 99%

Potassium as a Structural Promoter for an Iron/Activated Carbon Catalyst: Unusual Effect of Component Deposition Order on Magnetite Particle Size and Catalytic Behavior in Fischer–Tropsch Synthesis

et al. 2018

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The structural and catalytic properties of nanosized Fe3O4 particles deposited on activated charcoal (AC) are drastically affected by the sequence of component deposition order. Preliminary alkalization of AC followed by Fe deposition leads to formation of small magnetite particles (modal size of 4 nm) with uniform distribution. This catalyst demonstrates much higher iron‐time yield in FT synthesis than counterparts prepared by co‐impregnation and sequential impregnation with a reverse order of component deposition (Fe, then K). The catalysts were characterized by nitrogen adsorption, X‐ray diffraction, transmission electron microscopy, temperature‐programmed reduction in Ar/H2, and CO/H2 flow and in situ magnetic measurements. After calcinations in argon, catalysts contain iron predominantly in the form of magnetite with minor amount of hematite in some cases. Activation of the catalyst in the CO/H2 stream prior catalytic test leads to the formation of surface Hegg carbide Fe5C2. Spent catalysts contain considerable amount of magnetite, which is presumably due to partial oxidation of carbide by water in the course of the FT reaction.

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Thermal decomposition mechanism of iron(III) nitrate and characterization of intermediate products by the technique of computerized modeling

Cited by 82 publications

References 11 publications

Carbon–Silica Composite as an Effective Support for Iron Fischer–Tropsch Synthesis Catalysts

Carbon–Silica Composite as an Effective Support for Iron Fischer–Tropsch Synthesis Catalysts

Ferromagnetic Nanoparticle–Assisted Polysulfide Trapping for Enhanced Lithium–Sulfur Batteries

Potassium as a Structural Promoter for an Iron/Activated Carbon Catalyst: Unusual Effect of Component Deposition Order on Magnetite Particle Size and Catalytic Behavior in Fischer–Tropsch Synthesis

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