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Absorption kinetics and mechanisms of carbon monoxide in liquid niobium

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Abstract

Absorption kinetics and mechanisms of carbon monoxide in liquid niobium were investigated in the temperature range of 2700 to 3000 K in samples levitated in a CO/Ar stream. The carbon and oxygen dissolution in liquid niobium from CO gas is an exothermic process, and the solubilities of carbon and oxygen (Ce, Oe in at. pct) are related to temperature (T in kelvin) and partial pressure of CO (P co in atm) as follows:

$$\ln Ce + ln Oe - P_{co} = 2.32 \cdot 10^4 /T - 2.35$$

The reaction CO → [C] + [O], which occurs along with the evaporation of niobium oxide during the absorption of carbon and oxygen, is a second-order process with a first-order dependence on C and O concentrations, respectively. The absorption mechanism implies that the overall reaction rate is controlled by the substep of dissociation of surface-adsorbed CO molecules. The rate equations for C and O absorption are given as follows:

$$(dC/dt) = (1/0.76)(dO/dt) = 12.1(A/V)\exp ( - 26,700/T)(Ce Oe - CO)$$

where C and O are carbon and oxygen concentrations in atomic percent, respectively, A is the surface area of the sample in cm2, and V is the volume in cm3.

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Authors and Affiliations

  1. the R & D Center, Kia Steel Co., Ltd., 573400, Kunsan, Cheollabukdo, Korea

    H. G. Park (Principal Researcher)

  2. the Department of Materials Science and Engineering, University of Florida, 32611-6400, Gainesville, FL

    Reza Abbaschian (Chairman and Professor)

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  1. H. G. Park
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  2. Reza Abbaschian
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Park, H.G., Abbaschian, R. Absorption kinetics and mechanisms of carbon monoxide in liquid niobium. Metall Mater Trans B 28, 455–463 (1997). https://doi.org/10.1007/s11663-997-0112-5

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  • DOI: https://doi.org/10.1007/s11663-997-0112-5

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