The influence of CaCl 2 on the kinetics of the reaction 1 tremolite + 3 calcite + 2 quartz --> 5 diopside + 3 CO 2 + 1 H 2 O; an experimental investigation

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ID: 308551
1999
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Abstract
The effects of temperature and CaCl ~2~ concentration on the kinetics of the mineral reaction: 1 tremolite+3 calcite+2 quartz\--\>5 diopside+3 CO ~2~ +1 H ~2~ O were studied experimentally in cold sealed pressure vessels. Results were obtained in 130 runs under conditions equivalent to medium pressure amphibolite facies. Experiments were performed with and without CaCl ~2~ dissolved in a supercritical CO ~2~ -H ~2~ O mixture (CaCl ~2~ = 0 to 0.5 mol/l water; XCO ~2~ = 0.75 and 0.25). The pressure was 5+ or -0.05 kb, and the temperatures ranged from 630 degrees to 720 degrees (+ or -3 degrees C), with six different temperature oversteps of 13 degrees up to 103 degrees C above the equilibrium temperature of 617 degrees C. Percent conversion, measured by CO ~2~ production as a function of time for a period of up to 34 days (816 hrs), is presented, and the appropriate reaction rate constants (up to k = 5X10 (super -8) mol m (super -2) sec (super -1) ) as well as the apparent activation energies (E ~app~ = 255-470 kJ/mol) are extracted from the measured data. The observed asymmetric sigmoidal shape of all conversion versus time curves indicates changes in the rate-limiting process during the reaction. The development of the overall kinetics as a result of the combination of the different sub-processes (dissolution, nucleation, and growth of reactants and product) are discussed. Analysis of the experimental results shows that the reaction rates obtained from a chloride-bearing fluid are an order of magnitude larger than those obtained from chloride-free experiments. The implications for natural systems are quite important, because our results suggest that reaction rates may indeed be much faster than originally expected. Additionally, there seems to be evidence that nucleation starts earlier and is increased in the presence of a fluid that has even a low chloride content.
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openalex_W2004329330 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Ulf Winkler
Journal american journal of science
Year 1999
DOI
10.2475/ajs.299.5.393
URL
https://ajs.scholasticahq.com/article/60815.pdf
Keywords Keywords not found

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