In activated chemisorption the plot of the reciprocal of the rate Z=(dq/dt)–1 against the time t is convex towards the Z axis at low t and concave at high t. This condition is satisfied if both the energy of activation, Et and the number of available sites, Nt decrease with the coverage q and if d2Et/dq2 < 0. Two models are considered:
C. Aharoni and M. Ungarish, J. Chem. Soc., Faraday Trans. 1, 1977, 73, 456 DOI: 10.1039/F19777300456
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