Abstract
Enhancing the stability of supported noble metal catalysts emerges is a major challenge in both science and industry.Herein,a heterogeneous Pd catalyst(Pd/NCF)was prepared by supporting Pd ultrafine metal nanoparticles(NPs)on nitrogen-doped carbon;synthesized by using F127 as a stabilizer,as well as chitosan as a carbon and nitrogen source.The Pd/NCF catalyst was efficient and recyclable for oxidative carbonylation of phenol to diphenyl carbonate,exhibiting higher stability than Pd/NC prepared without F127 addition.The hydrogen bond between chitosan(CTS)and F127 was enhanced by F127,which anchored the N in the free amino group,increasing the N content of the carbon material and ensuring that the support could provide sufficient N sites for the deposition of Pd NPs.This process helped to improve metal dispersion.The increased metal-support interaction,which limits the leaching and coars-ening of Pd NPs,improves the stability of the Pd/NCF catalyst.Furthermore,density functional theory cal-culations indicated that pyridine N stabilized the Pd2+species,significantly inhibiting the loss of Pd2+in Pd/NCF during the reaction process.This work provides a promising avenue towards enhancing the sta-bility of nitrogen-doped carbon-supported metal catalysts.
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