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Despite significant advances in the fabrication and applications of microreactors for production of chemicals, their use for catalytic reactions remains a challenge, especially in fine chemical synthesis where the selectivity towards the desired product is an issue. A falling film microstructured reactor (FFMR) was tested in the selective hydrogenation of 2-butyne-1,4-diol (1) to its olefinic derivative (2). The FFMR plates were coated with Al₂O₃ or ZnO followed by the deposition of Pd nanoparticles (NPs). The oxides were deposited on the microstructured reaction plates using either conventional washcoating or atomic layer deposition (ALD) in the liquid or gas phase, respectively. The Pd-NPs were either formed via impregnation of an organometallic precursor with subsequent reduction, or with pre-fabricated Pd-NPs stabilized in poly(vinyl pyrrolidon) (PVP) with subsequent pyrolysis of the organic matrix and activation in …