Preparation of highly active platinum nanoparticles on ZSM-5 zeolite including cerium and titanium dioxides as photo-assisted deposition sites

Nano-sized Pt particles with high activities for CO oxidation have been successfully synthesized on the metal dioxide phases (CeO2 and TiO2) included within ZSM-5 zeolite by a photo-assisted deposition (PAD) method under UV-light irradiation. The obtained Pt nanoparticles on CeO2 within ZSM-5 by the PAD method (PAD-Pt/CeO2/ZSM-5) showed the highest catalytic activity for CO oxidation even at low temperature. The dispersion of Pt nanoparticles was investigated by CO adsorption, XAFS, and TEM analyses. The size of Pt nanoparticle of the PAD-Pt/CeO2/ZSM-5 catalyst was determined to be 2 nm. In addition, this catalyst has unique morphology; the Pt nanoparticles were selectively deposited on the CeO2 within ZSM-5 supports. It is found that the addition of CeO2 into the catalyst supports is effective to synthesize highly active nano-sized Pt particles using the PAD method under UV-light irradiation.