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    • Keywords

       

      Plant polyphenol; Pd nanoparticles; hydrodechlorination; 2,4-dichlorophenol; formic acid.

    • Abstract

       

      Heterogeneous Pd catalysts were developed by immobilizing Pd nanoparticles (Pd NPs) onto plant polyphenol (bayberry tannin, BT) decorated $\gamma$-Al$_2$O$_3$. The abundant hydroxyls of plant polyphenols were capable of stabilizing the Pd NPs. Transmission electron microscopy observation confirmed that the Pd NPs with the diameter of $3.75\pm 0.5$ nm were highly dispersed in the catalyst. The as-prepared Al$_2$O$_3$–BT–Pd catalysts were found to be highly active in mild hydrodechlorination (HDC) of 2,4-dichlorophenols (DCPs) using formic acid as a hydrogen source. The 2,4-DCPs were completely dechlorinated in 4 h at 30$^{\circ}$C and under atmospheric pressure. During the catalytic HDC, the stabilizingcapability of BT successfully prevented the leakage and aggregation of Pd NPs, thus ensuring a high cycling stability withstable and high catalytic activity. The Al$_2$O$_3$–BT–Pd catalysts were recycled six times, without obvious loss of activity. In the sixth cycle, the catalytic HDC yield still reached 98.29% under the same reaction conditions, superior to the controlcatalysts, including $\gamma$-Al$_2$O$_3$ supported Pd NPs (Al$_2$O$_3$–Pd) and powdered activated carbon supported Pd NPs (AC–Pd).Furthermore, the Al$_2$O$_3$–BT–Pd also showed high activity in the mild catalytic HDC of 2,4,6-trichlorophenols andchlorobenzene derivatives. Our results demonstrated efficient catalysts to address the environmental issue of chlorophenolpollution.

    • Author Affiliations

       

      MENG XIAO1 YU PENG1 MENGTING PANG1 BAICUN HAO1 YUJIA WANG1 YULIAN ZHANG1 YANG LIAO1 2 HUI MAO1 2

      1. College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, People’s Republic of China
      2. Key Laboratory of Land Resources Evaluation and Monitoring in Southwest, Sichuan Normal University, Ministry of Education, Chengdu 610066, People’s Republic of China
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