On the kinetics of the chlorination of titanium dioxide in the presence of solid carbon View Full Text


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Article Info

DATE

1980-06

AUTHORS

I. Barin, W. Schuler

ABSTRACT

The influence of solid carbon on the chlorination of TiO2 with Cl2 and CO-CO2-Cl2 gas mixtures was investigated gravimetrically using rutile and graphite tablets. In the experiments, the temperature, composition and total pressure of the gas phase as well as the TiO2-C separation were varied. The chlorination rate of TiO2 was found to be 40 to 50 times faster with TiO2-C contact than in the absence of carbon. The acceleration of the chlorination rate is due to the kinetic influence of solid carbon and takes place even when TiO2 and C are separated by the gas phase. In the latter case the C influence decreases with increasing TiO2-C separation. In the case of flowing Cl2-Ar mixtures at 105 Pa total pressure this influence exists within a critical TiO2-C separation,L, which is approximately 40 μm at 1273 K and PCl2= 2.7 × 104 Pa.L increases linearly with increasing temperature and decreases approximately linearly with increasing total gas pressure in the case of a closed reaction vessel. The ratio of the reacted amounts of TiO2 and C is also dependent on the TiO2-C separation. From the experimental results a kinetic reaction model is proposed to provide a quantitative description of the influence of solid carbon. The dependence of the chlorination rate,i, of TiO2 on the TiO2-C separation,l, is given byi ∼ (l + Β)−2 whereΒ is a constant. More... »

PAGES

199-207

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02668402

DOI

http://dx.doi.org/10.1007/bf02668402

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1029642087


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