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Future research in this field will help the understanding of the sometimes contradictory results in this field. It has been increasingly accepted that most heterogeneous Pd catalysts catalyze in a homogeneous way by leached Pd species, which can re-deposit when the reaction comes to an end. However, general conclusions are difficult to attain because in most cases the mechanism of a certain reaction is affected by the conditions very much. Although there are also other modern trends in Pd catalysis, such as polymer-supported Pd, Pd nanoparticles, or Pd clusters, it can be expected that the application of Pd supported by inorganic materials will gain increasing importance and application in future.
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