Studies on the reduction of iron oxide with hydrogen

Sastri, M.V.C.; Viswanath, R. P.; Viswanathan, B.

doi:10.1016/0360-3199(82)90163-x

Cited by 139 publications

(80 citation statements)

References 10 publications

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“…In this respect it is noted that the analysis of hydrogen reduction kinetics by hygrometry study provides reliable data for early stage of the process in the range of 0:1 0:8 in the present investigation. Compared with the reported data for hydrogen reduction process of Fe 2 O 3 -Fe (51 kJ/mol at <848 K, 38 kJ/mol at >848 K 24) and 57 kJ/mol 25) ), the present data of 35-46 kJ/mol obtained in this study is reliable. Especially, we expect that the initial activation energy at ¼ 0:1 is most accurate corresponding to real value.…”

Section: Effect Of Structure Modificationsupporting

confidence: 72%

“…Also, it is confirmed that the activation energies in the range of < 0:8 having almost equal values are consistent with those of literature values. 24,25) 5.3 Retarding effect of outflowing diffusion of water vapor Now the question arises how and what we can understand about the results (Fig. 8) of a hygrometry study for understanding the hydrogen reduction of process of nanoscale Fe 2 O 3 powder.…”

Section: Effect Of Structure Modificationmentioning

confidence: 99%

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In-Situ Kinetic Study of Hydrogen Reduction of Fe2O3 for the Production of Fe Nanopowder

Jung

Lee

2009

Mater. Trans.

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The reduction kinetics of Fe 2 O 3 nanopowder was investigated by monitoring the reduction behavior in real-time and measuring the amount of outflowing water vapor using in-situ hygrometry study. The kinetics of hydrogen reduction of Fe 2 O 3 was also studied on the basis of phase transformation, structure modification and outflowing diffusion of water vapor of the Fe 2 O 3 powder during reaction. Activation energy for the hydrogen reduction of Fe 2 O 3 nanopowder was calculated at various heating rate conditions and conversion fraction of reaction. The activation energies for reduction of Fe 2 O 3 nanopowder obtained in this study existed in the range of 20-46 kJ/mol. The activation energy for reduction of Fe 2 O 3 nanopowder obtained in this study decreased from 46 kJ/mol to 20 kJ/mol during the entire reduction process. Therefore, the hygrometry study is a powerful tool for in-situ kinetic study of hydrogen reduction of metal oxide for mass production.

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Section: Effect Of Structure Modificationsupporting

confidence: 72%

Section: Effect Of Structure Modificationmentioning

confidence: 99%

In-Situ Kinetic Study of Hydrogen Reduction of Fe2O3 for the Production of Fe Nanopowder

Jung

Lee

2009

Mater. Trans.

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“…Iron ores consisting of significant TiO2 such as ilmenite are low cost ores, but due to the high TiO2 content its use may result in significant issues within the blast furnaces such as lower reduction degree, [1][2][3][4] changes in the liquidus temperature in slag, [5][6][7] lower residual removal by the slag, [8][9][10] and viscosity changes within the bosch and hearth. [11][12][13][14][15] However, potential benefits of TiO2 in the blast furnace slags have also been known by forming a protective layer of titanium carbo-nitride on the refractory brick and inhibiting the premature failure and erosion of the hearth.…”

Section: Introductionmentioning

confidence: 99%

Influence of TiO2 on the Viscous Behavior of Calcium Silicate Melts Containing 17 mass% Al2O3 and 10 mass% MgO

et al. 2012

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“…14 The heat from the laser in combination with the hydrogen reduces this iron-oxide back to iron using the following redox relations: 21,22 …”

Section: B Catalystmentioning

confidence: 99%

Closed-loop control of laser assisted chemical vapor deposition growth of carbon nanotubes

Burgt

Bellouard

Mandamparambil

et al. 2012

Journal of Applied Physics

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Laser-assisted chemical vapor deposition growth is an attractive mask-less process for growing locally aligned nanotubes in selected places on temperature sensitive substrates. An essential parameter for a successful and reproducible synthesis of nanotubes is the temperature during growth. Here, we demonstrate a temperature feedback control mechanism based on the dynamic, in situ monitoring of the infrared radiation coupled with reflectivity information. With the information provided by these sensors, an infrared laser, focused on a silicon substrate covered with aluminum-oxide and iron catalyst layers, can be controlled. The growth takes place in a gaseous mixture of argon (carrier gas), hydrogen (process gas), and ethylene (carbon-containing gas). Scanning electron microscopy and Raman spectroscopy analysis demonstrate the excellent reproducibility of the closed-loop control process over multiple experiments. Furthermore, we developed a unique method to identify the onset for catalyst formation and activation by monitoring the fluctuation of the reflected laser beam.

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Studies on the reduction of iron oxide with hydrogen

Cited by 139 publications

References 10 publications

<I>In-Situ</I> Kinetic Study of Hydrogen Reduction of Fe<SUB>2</SUB>O<SUB>3</SUB> for the Production of Fe Nanopowder

<I>In-Situ</I> Kinetic Study of Hydrogen Reduction of Fe<SUB>2</SUB>O<SUB>3</SUB> for the Production of Fe Nanopowder

Influence of TiO2 on the Viscous Behavior of Calcium Silicate Melts Containing 17 mass% Al2O3 and 10 mass% MgO

Closed-loop control of laser assisted chemical vapor deposition growth of carbon nanotubes

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