首页|Enhanced stability of nitrogen-doped carbon-supported palladium catalyst for oxidative carbonylation of phenol
Enhanced stability of nitrogen-doped carbon-supported palladium catalyst for oxidative carbonylation of phenol
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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.
Xiaojing Liu、Ruohan Zhao、Hao Zhao、Zhimiao Wang、Fang Li、Wei Xue、Yanji Wang
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Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving,School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130,China
Tianjin Key Laboratory of Chemical Process Safety,Tianjin 300130,China
Hebei Industrial Technology Research Institute of Green Chemical Industry,Huanghua 061100,China
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