Remarkably efficient Pt/CeO-AlO catalyst for catalytic hydrodeiodination of monoiodoacetic acid: Synergistic effect of AlO and CeO.

Monoiodoacetic acid (MIAA) is one of the highly toxic halogenated disinfection by-products, which is formed during water disinfection processes. Catalytic hydrogenation with supported noble metal catalyst is a green and effective technique for the transformation of halogenated pollutant, but its activity still needs to be identified. In this study, Pt nanoparticles were supported on CeO modified γ-AlO (Pt/CeO-AlO) by chemical deposition method and the synergistic effect of AlO and CeO on catalytic hydrodeiodination (HDI) of MIAA was systematically studied. Characterizations revealed that Pt dispersion could be improved by the introduced CeO through the formation of Ce-O-Pt bond and MIAA adsorption could be facilitated by high Zeta potential of AlO component. Furthermore, optimal Pt/Pt could be obtained by adjusting CeO deposition amount on AlO, which could effectively facilitate the activation of C-I bond. Therefore, Pt/CeO-AlO exhibited remarkable catalytic activities and TOF values compared with those of Pt/CeO and Pt/AlO Through detailed kinetic experiments and characterization, the extraordinary catalytic performance of Pt/CeO-AlO can be attributed to the abundant Pt sites as well as the synergistic effect between CeO and AlO.