Abstract
An enhancement in catalytic alcohol oxidation activity is attributed to the presence of nitrogen heteroatoms on the external surface of a support material. The same Pd particles (3.1-3.2 nm) were supported on polymeric carbon-nitrogen supports and used as catalysts to selectively oxidize benzyl alcohol. The polymeric carbon-nitrogen materials include covalent triazine frameworks (CTF) and carbon nitride (C(3)N(4)) materials with nitrogen content varying from 9 to 58 atomic percent. With comparable metal exposure, estimated by X-ray photoelectron spectroscopy, the activity of these catalysts correlates with the concentration of nitrogen species on the surface. Because the catalysts showed comparable acidic/basic properties, this enhancement cannot be ascribed to the Lewis basicity but most probably to the nature of N-containing groups that govern the adsorption sites of the Pd nanoparticles.
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