We describe the successful possibility of the immobilization of a photocatalyst on foam, which is beneficial from a practical point of view. An immobilized photocatalyst is possible for use in a continuous experiment and can be easily separated from the reactor after the reaction concludes. Parent TiO2, La/TiO2, and Nd/TiO2 photocatalysts (containing 0.1 wt.% of lanthanide) were prepared by the sol-gel method and immobilized on Al2O3/SiO2 foam (VUKOPOR A) by the dip-coating method. The photocatalysts were investigated for the photocatalytic hydrogen generation from an aqueous ammonia solution under UVA light (365 nm). The evolution of hydrogen was compared with photolysis, which was limited to zero. The higher hydrogen generation was observed in the presence of 0.1 wt.% La/TiO2 than in 0.1 wt.% Nd/TiO2. This is, besides other things, related to the higher level of the conduction band, which was observed for 0.1 wt.% La/TiO2. The higher conduction band's position is more effective for hydrogen production from ammonia decomposition.

Faculty of Chemical Technology University of Pardubice 573 Studentská Pardubice Czech Republic

Faculty of Chemistry Jagiellonian University Gronostajowa 2 30 387 Kraków Poland

Institute of Environmental Technology VŠB Technical University of Ostrava 17 listopadu 15 708 00 Ostrava Poruba Czech Republic

Institute of Physical Chemistry and Chemical Physics Faculty of Chemical and Food Technology Slovak University of Technology in Bratislava Radlinského 9 SK 812 37 Bratislava Slovakia

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