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Activity of coals of different rank to ozone

1 Laboratory of Physics and Chemistry of Coals, Mining Institute, National University of Science and Technology “MISiS”, 119049 Moscow, Russia
2 Chemical Kinetics Laboratory, Karpov Institute of Physical Chemistry, 105064 Moscow, Russia

Topical Section: Energy Exploration Technology

Coals of different rank were studied in order to characterize their activity to ozone decomposition and changes of their properties at interaction with ozone. Effects of coal rank on their reactivity to ozone were described by means of kinetic modeling. To this end, a model was proposed for evaluation of kinetic parameters describing coals activity to ozone. This model considers a case when coals surface properties change during interaction with ozone (deactivation processes). Two types of active sites (zones at the surface that are able to decompose ozone) were introduced in the model differing by their deactivation rates. Activity of sites that are being deactivated at relatively higher rate increases with rank from 2400 1/min for lignite to 4000 1/min for anthracite. Such dependence is related to increase of micropores share in coals structure that grows from lignites to anthracites. Parameter characterizing initial total activity of coals to ozone decomposition also depends on rank by linear trend and vary between 2.40 for lignites up to 4.98 for anthracite. The proposed model could further be used in studies of coals oxidation processes and tendency to destruction under the weathering and oxidation conditions.
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