水溶液中における合成11Åトバモライトの炭酸化反応に関する研究

概要

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The results in the present study are summarized as follows; (1) The carbonation reaction of synthetic 11Å tobermorite in aqueous solution occurs through two rate-determining step, that is, the rate-determining step changes from the surface reaction to the internal diffusion process with the progress of carbonation. This phenomenon is considered to be due to the increase in the diffusion resistance with the formation of CaCO_3 in the reaction layer of tobermorite. (2) The rete law for the surface reaction control process is expressed as -d[CaO]/dt=k[CaO][CO_2]_< aq >, wherek is 1.67M^< -1 > min^< -1 > at 30℃ and the activation energy for k is 35.3 kJ/mol. (3) The carbonation rate of synthetic 11Å tobermorite in the aqueous solution is relatively fast. Hence, it is expected that tobermorite is applicable as the material for fixation and solidification of ^< 14 >CO_2 by finding the optimal conditions.
社団法人日本セラミックス協会の論文
1993-02-01