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Isothermal dynamic thermal diffusivity studies of the reduction of NiO and NiWO4 precursors by hydrogen
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.ORCID-id: 0000-0002-2358-7719
Kungliga tekniska högskolan, KTH.
2011 (engelsk)Inngår i: International Journal of Materials Research - Zeitschrift für Metallkunde, ISSN 1862-5282, E-ISSN 2195-8556, Vol. 102, nr 11, s. 1336-1344Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
2011. Vol. 102, nr 11, s. 1336-1344
HSV kategori
Forskningsprogram
Processmetallurgi
Identifikatorer
URN: urn:nbn:se:ltu:diva-8627DOI: 10.3139/146.110591ISI: 000297955000004Lokal ID: 725a122b-6c0b-488a-b024-46263debc15cOAI: oai:DiVA.org:ltu-8627DiVA, id: diva2:981565
Merknad
Validerad; 2011; 20111209 (andbra)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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