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Isothermal dynamic thermal diffusivity studies of the reduction of NiO and NiWO4 precursors by hydrogen

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Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 102 Issue 11

Abstract

Thermal diffusivity measurements of uniaxially cold pressed NiO and NiWO4 were carried out in a dynamic mode in order to monitor the kinetics of hydrogen reduction of the above-mentioned materials using a laser flash unit. The calculated activation energy was found to be higher than that for chemically-controlled reaction obtained earlier by thermogravimetry. The difference has been attributed to physical changes occurring along with the chemical reaction. The activation energy of sintering of the products was evaluated to be 33 and 36 kJ · mol−1 for NiO and NiWO4, respectively. Thermal conductivities were calculated taking into consideration the change in heat capacity considering the compositional and the structural changes with the progress of the reaction. The potentiality of the laser-flash method as a complementary technique to thermogravimetry in understanding the mechanism of gas – solid reactions is discussed.

Keywords: Thermal diffusivity; Gas – solid reactions; Reduction by hydrogen; Ni – W – O system; Laser flash
* Correspondence address, Dr. Hesham Mohamed Ahmed, Sustainable Process Engineering Division, Dept. of Civil, Environmental and Natural Resources (SBN), Luleå University of Technology, 971 87 Luleå, Sweden, Tel.: +46 920 49 13 09, Mobil: +46 762 36 46 86, E-mail:

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Received: 2010-10-12
Accepted: 2011-08-29
Published Online: 2013-06-11
Published in Print: 2011-11-01

© 2011, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Changes in the Editorial Office of IJMR
  5. Original Contributions
  6. Influence of the nature of an electric field applied during the solution heat treatment of the Al-Mg-Si-Cu Alloy AA6111 on subsequent natural aging
  7. Isothermal dynamic thermal diffusivity studies of the reduction of NiO and NiWO4 precursors by hydrogen
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  9. Effect of Ce content on the microstructure of semisolid Mg-10Al alloy
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  11. Recovery stress and shape memory stability in Ni–Ti–Cu thin wires at high temperatures
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  13. Microstructure of austenitic stainless steels of various phase stabilities after cyclic and tensile deformation
  14. High temperature workability behaviour of a modified P92 steel
  15. Influence of mineralized collagen fibrils on the thermo-sensitivity of an injectable scaffold for bone regeneration
  16. Low temperature synthesis of CuGeO3 nanoflowers from n-heptane solvent
  17. Preparation of Zn1–xMnxO nanoparticles by a simple “green” method and photocatalytic activity under visible light irradiation
  18. Surface morphology, electrical and optical properties n-type doped MOCVD grown GaSb using dimethyltellurium
  19. The role of polymethylhydrosiloxane in the sol-gel synthesis of high surface area porous silicon carbide
  20. Synthesis, characterization and dehydration–rehydration study of sol-gel derived hydroxide hydrogel of the MgO–ZrO2 system
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https://doi.org/10.3139/146.110591
Keywords for this article
Thermal diffusivity; Gas – solid reactions; Reduction by hydrogen; Ni – W – O system; Laser flash

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Changes in the Editorial Office of IJMR
  5. Original Contributions
  6. Influence of the nature of an electric field applied during the solution heat treatment of the Al-Mg-Si-Cu Alloy AA6111 on subsequent natural aging
  7. Isothermal dynamic thermal diffusivity studies of the reduction of NiO and NiWO4 precursors by hydrogen
  8. Heating rate effects on reverse martensitic transformation in a Cu – Zn – Al shape memory alloy
  9. Effect of Ce content on the microstructure of semisolid Mg-10Al alloy
  10. Dielectric properties of low-temperature sintered Ba(Fe0.5Nb0.5)O3 with BaCu(B2O5) addition
  11. Recovery stress and shape memory stability in Ni–Ti–Cu thin wires at high temperatures
  12. Microstructure and mechanical properties of WC-Ni-Al based cemented carbides developed for engineering applications
  13. Microstructure of austenitic stainless steels of various phase stabilities after cyclic and tensile deformation
  14. High temperature workability behaviour of a modified P92 steel
  15. Influence of mineralized collagen fibrils on the thermo-sensitivity of an injectable scaffold for bone regeneration
  16. Low temperature synthesis of CuGeO3 nanoflowers from n-heptane solvent
  17. Preparation of Zn1–xMnxO nanoparticles by a simple “green” method and photocatalytic activity under visible light irradiation
  18. Surface morphology, electrical and optical properties n-type doped MOCVD grown GaSb using dimethyltellurium
  19. The role of polymethylhydrosiloxane in the sol-gel synthesis of high surface area porous silicon carbide
  20. Synthesis, characterization and dehydration–rehydration study of sol-gel derived hydroxide hydrogel of the MgO–ZrO2 system
  21. DGM News
  22. DGM News
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