The H-2 production rate from H2S photocatalytic decomposition under visible light irradiation (lambda > 400 nm) over CdS nanoparticules formed in HY-zeolite pore (named CdS/HY) was much higher compared to the commercial bulk CdS. The CdS/HY photocatalyst was characterized by UV-Vis, XRD, FT-IR, N-2 adsorption, SEM and HRTEM. The blue shift from bulk which confirmed CdS nanoparticles located in the pore of HY-Zeolite (named NY). Photocatalytic activity and surface area were enhanced by such structures. (C) 2010 Elsevier Ltd. All rights reserved.