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Table 4

Transition state energies(*) ΔH# (kcal mol−1) with respect to the energies of the reactants (OH)ads, (H2)ads, and (OH+H2)ads as a function of the number (n) of H2O in the supporting cluster.

Cluster (n) 1 2 3 24(1-L.) 48(2-L.)
ER(OH) 4.7 4.6 4.5 4.1 3.5 4.1
ER(H2) –0.4 –4.6 –5.3 –7.0 –7.4 –10.3
LH(OH+H2) 5.4 5.0 4.9 4.7 3.9 5.1

Notes. (*) MPWB1K/aug-cc-pVTZ except for the 2-layers case where the basis set is 6-311++G(3df,2p).

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