Stabilizing Pd Nanoparticles in Supported‐Ionic‐Liquid‐Phase (SILP) Catalyst Using Polydimethylsiloxane Via Hydrophobic Structure for Boosting Hydrodechlorination of 4‐Chlorophenol

• Published in: ChemistrySelect (Weinheim) 2020-12, Vol.5 (46), p.14626-14631
• Main Authors: Chen, Xianlang, Chen, Jingjing, Zhang, Jieyu, Tang, Tian, Xu, Qian qian, Zhao, Bo, Lu, Jinyue, Li, Rongrong, Han, Deman
• Format: Article
• Language: English
• Subjects: 4-chlorophenol; hydrodechlorination; palladium nanoparticles; PDMS
• ISSN: 2365-6549; 2365-6549
• DOI: 10.1002/slct.202003924

Polydimethylsiloxane (PDMS) and 1‐butyl‐3‐methylimidazolium trifluoroacetate ionic liquid (IL) modified palladium‐based catalyst supported on activated carbon have been prepared and measured for hydrodechlorination of 4‐chlorophenol (4‐CP) using (HCOOH + HCOONa) as hydrogen source. For turnover frequency of 4‐CP HDC reaction to obtain a value of 3.0×105 h−1 and five times better than the value of the catalyst without PDMS. This may be due to the addition of PDMS which can promote the dispersion of the nanoparticles. The conversion of the catalyst HDC decreased from 100 % to 92 % after 5 times which may be due to a hydrophobic structure formed in the catalyst after the addition of PDMS. The application of PDMS modified Pd catalysts has excellent properties and stability of selective hydrogenation of p‐chlorophenol to phenol. This may due to the addition of PDMS which can promote the dispersion of the nanoparticles and hydrophobic structure formed in the catalyst, which leads to leads to the increase of the active sites of the catalyst and the good contact between the reactants and the catalyst.