title: [Catalytic hydrodechlorination of 2,4-dichlorophenol over Pd/TiO2].
abstract: Pd/TiO2 catalysts were prepared by the deposition-precipitation and impregnation methods, and were further characterized by TEM, XRD and ICP-AES. The liquid catalytic hydrodechlorination of 2,4-dichlorophenol over the catalysts was investigated. It is demonstrated that despite catalyst prepared by deposition-precipitation method exhibits higher activity than that synthesized from impregnation method, both catalysts show good performance in hydrodechlorination process. When initial concentration of the reactant was 3.11 mmol x L(-1), pH was 12 and amount of catalyst used was 50 mg, hydrodechlorination of 2,4-dichlorophenol was completed within 45 min. Acidic condition facilitates hydrodechlorination process. The initial activity was not significantly influenced when the amount of catalyst used varied between 15-80 mg, which proves that mass transport limitation exerts little impact on hydrodechlorination reaction. Finally, the initial activity sharply enhanced with the increase of initial concentration of 2,4-dichlorophenol when the concentration was in the range of 0.62-3.11 mmo x L(-1) while it almost remained constant with further increasing the initial concentration. Therefore, the catalytic hydrodechlorination of 2,4-dichlorophenol over Pd/TiO2-DP follows the Langumuir-Hinshelwood model, indicating that the catalytic hydrodechlorination is controlled by 2,4-dichlorophenol adsorption.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, China.
authors.forename: Yin
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yun
authors.initials: Y
authors.lastname: Shao
authors.forename: Huan
authors.initials: H
authors.lastname: Chen
authors.forename: Hai-Qin
authors.initials: HQ
authors.lastname: Wan
authors.forename: Yu-Qiu
authors.initials: YQ
authors.lastname: Wan
authors.forename: Shou-Rong
authors.initials: SR
authors.lastname: Zheng
mesh_terms: D000327:Adsorption; D002384:Catalysis; D002713:Chlorine / Q000737:chemistry; D002733:Chlorophenols / Q000737:chemistry* / Q000302:isolation & purification; D010165:Palladium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
chemical_list: D002733:Chlorophenols; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D002713:Chlorine; D010165:Palladium; D014025:Titanium; C004762:2,4-dichlorophenol