TY  - JOUR
AU  - Kamberović, Željko
AU  - Raic, Karlo
AU  - Filipovic, Mirjana
AU  - Anđić, Zoran
AU  - Korać, Marija
PY  - 2011
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1205
AB  - Presented study shows the analysis of the process of reduction of WO(3) powder with hydrogen in the vertical tube reactor, representing a new approach in comparison to the conventional methods in the horizontal tube reactor. SEM analysis of the synthetisized tungsten powder shows the existence of particles, approximately 1 mu m in size, both individual ones and those within the porous agglomerates with a spongy structure. In order to study the mechanism and kinetics of the reduction process, the reduction degree and retention time of particles of WO(3) powder in the reaction zone were calculated using a developed mathematical model, based on the application of Stokes' law. Kinetic parameters and activation energies were determined at the corresponding temperature intervals. Kinetic analysis showed that the process of WO(3) reduction with hydrogen in the vertical tube reactor in the temperature interval from 700 to 900 degrees C occurs in the kinetic zone. Activation energy for the temperature interval from 700 to 800 degrees C is E(a1)=7.5+/-0.1kJ/mol, whereas for the temperature interval from 800 to 900 degrees C, activation energy is E(a2)=14.6+/-0.1 kJ/ma A model was proposed describing the mechanism of the reduction process in the vertical tube reactor according to which particles of tungsten powder 1 mu m in size arise from the stretching and cracking of coarse particles in the reduction zone, as well as from the appropriate temperature shock outside this zone.
PB  - Editura Stiintifica Fmr, Bucharest
T2  - Metalurgia International
T1  - The Mechanism and Kinetics of the Tungsten (Vi)-Oxide Reduction in the Vertical Tube Reactor
VL  - 16
IS  - 12
SP  - 52
EP  - 57
UR  - https://hdl.handle.net/21.15107/rcub_cherry_1205
ER  - 

@article{
author = "Kamberović, Željko and Raic, Karlo and Filipovic, Mirjana and Anđić, Zoran and Korać, Marija",
year = "2011",
abstract = "Presented study shows the analysis of the process of reduction of WO(3) powder with hydrogen in the vertical tube reactor, representing a new approach in comparison to the conventional methods in the horizontal tube reactor. SEM analysis of the synthetisized tungsten powder shows the existence of particles, approximately 1 mu m in size, both individual ones and those within the porous agglomerates with a spongy structure. In order to study the mechanism and kinetics of the reduction process, the reduction degree and retention time of particles of WO(3) powder in the reaction zone were calculated using a developed mathematical model, based on the application of Stokes' law. Kinetic parameters and activation energies were determined at the corresponding temperature intervals. Kinetic analysis showed that the process of WO(3) reduction with hydrogen in the vertical tube reactor in the temperature interval from 700 to 900 degrees C occurs in the kinetic zone. Activation energy for the temperature interval from 700 to 800 degrees C is E(a1)=7.5+/-0.1kJ/mol, whereas for the temperature interval from 800 to 900 degrees C, activation energy is E(a2)=14.6+/-0.1 kJ/ma A model was proposed describing the mechanism of the reduction process in the vertical tube reactor according to which particles of tungsten powder 1 mu m in size arise from the stretching and cracking of coarse particles in the reduction zone, as well as from the appropriate temperature shock outside this zone.",
publisher = "Editura Stiintifica Fmr, Bucharest",
journal = "Metalurgia International",
title = "The Mechanism and Kinetics of the Tungsten (Vi)-Oxide Reduction in the Vertical Tube Reactor",
volume = "16",
number = "12",
pages = "52-57",
url = "https://hdl.handle.net/21.15107/rcub_cherry_1205"
}

Kamberović, Ž., Raic, K., Filipovic, M., Anđić, Z.,& Korać, M.. (2011). The Mechanism and Kinetics of the Tungsten (Vi)-Oxide Reduction in the Vertical Tube Reactor. in Metalurgia International
Editura Stiintifica Fmr, Bucharest., 16(12), 52-57.
https://hdl.handle.net/21.15107/rcub_cherry_1205

Kamberović Ž, Raic K, Filipovic M, Anđić Z, Korać M. The Mechanism and Kinetics of the Tungsten (Vi)-Oxide Reduction in the Vertical Tube Reactor. in Metalurgia International. 2011;16(12):52-57.
https://hdl.handle.net/21.15107/rcub_cherry_1205 .

Kamberović, Željko, Raic, Karlo, Filipovic, Mirjana, Anđić, Zoran, Korać, Marija, "The Mechanism and Kinetics of the Tungsten (Vi)-Oxide Reduction in the Vertical Tube Reactor" in Metalurgia International, 16, no. 12 (2011):52-57,
https://hdl.handle.net/21.15107/rcub_cherry_1205 .