1. This is consistent with the observation of the dynamics of different intermediates and products. In contrast, for Rh/TiO 2 , k 2 , k 3 and k 4 were markedly smaller than k 1 . k 1 /k 2 +k 3 +k 4 was calculated to be 3.1, indicating that the HDH of 2,4,6-triiodophenol on Rh/TiO 2 was mainly stepwise. In the case of 4-chloro-2,6-diiodophenol, for Pd/TiO 2 , k 2 (0.103 min -1 ) is even higher than k 1 (0.082 min -1 ), reflecting that concerted cleavage of the two C-I bonds of 4-chloro-2,6-diiodophenol was more favorable than the stepwise pathway. However, k 1 is 3 orders of magnitude larger than k 2 for the HDH of 4-chloro-2,6-diiodophenol on Rh/TiO 2 , suggesting a stepwise HDH of the two C-I bonds of 4chloro-2,6-diiodophenol. The reaction rate for the HDH of 4-chlorophenol to phenol on Pd/TiO 2 was 0.001 min -1 (k 6 ), markedly lower than that of Rh/TiO 2 (0.021 min -1 (k 8 ));D�az;The rate constants (assuming that all reactions involved follow the pseudo-firstorder kinetics) were quantified by fitting and integrating the kinetic data,2008
2. Metal-mediated reductive hydrodehalogenation of organic halides;F Alonso;Chem. Rev,2002
3. Comparative measurements of the dispersion of Pd catalyst on SiO 2 -AlPO 4 support using TEM and H 2 chemisorption;M A Aramendia;Colloid Surf. A,1996