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A study of the rates of carbon-carbon dioxide reaction in the temperature range 839 to 1050 C

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Abstract

The rates of reaction between porous pellets of carbon and pure carbon dioxide at 1 atm were investigated at several temperatures in the range 839° to 1050°C. The effects of pellet size and temperature on the observed rates were demonstrated. The interpretation of the data was based on a kinetic law of the form: rate = I1 PCO2/[1 + I2 PCO + I3 PCO2] The values of I2 and I3 were taken from the literature. The values of intrinsic rateRi were derived from the present data by making the correction for incomplete pore diffusion effects using a generalized method for evaluating effectiveness factors. The intrinsic rates of C-CO2 reaction were interpreted by the mechanism,

$$CO_2 {\text{ (}}g{\text{) + }}f_C {\text{ }}^{\underrightarrow {\mathop k\nolimits_{\text{1}} }} {\text{ CO (}}g{\text{) + (O) }}_{\text{C}} $$

and

$$(O)_C {\text{ }}^{\underrightarrow {\mathop k\nolimits_{\text{2}} }} {\text{ CO (}}g{\text{) + }}f_{\text{C}} $$

fCand (O)C, respectively, are free and occupied reaction sites on the carbon surface. The temperature-dependence of the intrinsic rate constant,k i =k 2 [ΣC], can be represented byk i = 109.51 exp. (-79,600/RT@#@)g-mole/g of C-s. [ΣC] is the total number of reaction sites on the carbon surface, in g-mole/g of C.

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Authors and Affiliations

  1. Henry Krumb School of Mines, Columbia University, New York, NY

    Y. K. Rao (Associate Professor)

  2. Research Metallurgist, Gulf Chemical and Metallurgical Corp., Texas City, Texas

    B. P. Jalan

Authors
  1. Y. K. Rao
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  2. B. P. Jalan
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Additional information

B. P. JALAN, Formerly Graduate Student, Henry Krumb School of Mines, Columbia University,

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Rao, Y.K., Jalan, B.P. A study of the rates of carbon-carbon dioxide reaction in the temperature range 839 to 1050 C. Metall Trans 3, 2465–2477 (1972). https://doi.org/10.1007/BF02647051

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