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Published 1985 | public
Journal Article

Kinetics of iodine dissociation on silica surfaces between 800-1000 K


The heterogeneously activated atomization of I_2 was studied by modulated beam mass spectrometry in a fused silica molecular flow reactor between 800-1000 K. Experimental dissociation rates at 1000 K are about 10^(3.9) times faster than those estimated for the decomposition of fully equilibrated gas-phase iodine molecules at the same collision frequency and the associated activation energy, E = 24.5 kcal/mol, is considerably smaller than D_O (I_2). Both effects can be ascribed to a chemical reaction involving physisorbed species rather than to direct interfacial energy transfer or reactive gas-solid interactions.

Additional Information

© 1985 Asociación Química Argentina. Received: October 1984. This work is supported by CIC, SUBCYT and CONICET of Argentina.

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August 19, 2023
October 23, 2023