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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.