| 초록 |
For selective alkyne hydrogenation, diverse selectivity modifiers such as carbon monoxide and heteroatom-containing organic molecules are added into the reactant feeds during the reaction. These modifiers can be adsorbed on the catalyst surface in moderate strength, which modulates the adsorption/desorption behaviors of reactants/intermediates. However, the modifiers should be continuously added to the reaction feeds to maintain selectivity, because they are readily decomposed or leached out during reactions. Here, we prepared Pd catalysts supported on a thermochemically stable covalent organic polymer (COP) containing diphenyl sulfide linkages which can act as a permanent selectivity modifier. The sulfide functional groups capping the Pd surface behave like a ‘molecular gate’ that enables exceptionally discriminative adsorption of alkynes over alkenes. This leads to highly selective hydrogenation of various alkynes to alkenes with minimal conversion of other functional groups. |
