Effect of LiCl on the Rate of Calcite Decomposition

Autor:	D. Beruto, Alan W. Searcy, Gary F. Knutsen
Rok vydání:	1982
Předmět:	Calcite Langmuir chemistry.chemical_compound Chemistry Materials Chemistry Ceramics and Composites Recrystallization (metallurgy) Thermodynamics Knudsen number Initial rate Eutectic system
Zdroj:	Journal of the American Ceramic Society. 65:219-222
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.1982.tb10409.x
Popis:	The rate of decomposition of calcite powder in vacuum was measured by the Langmuir and Knudsen methods. Measured pressures in effusion cells in the absence of additives approach the equilibrium value. The Langmuir experiments gave an apparent equilibrium CO2 pressure of =3×10−4 times the known pressure for the reaction. It is suggested that the CO2 is in equilibrium with the calcite but the CaO is not. In Langmuir experiments, 10 wt% LiCl does not increase the initial decomposition rate. In the Knudsen cells, 10 wt% LiCl can increase the initial rate by >2 times. LiCl reduces the surface area of the product CaO under either condition from ≥30 to ∼1 m2/g. Probably an LiCl-CaO eutectic provides a solution path for CaO recrystallization and, at high CO2 pressures, also for CaCO3 decomposition.
Databáze:	OpenAIRE
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