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Catalytic hydrodechlorination of 4 - chlorophenol in an aqueous solution with Pd/Ni catalyst and formic acid / Shu Wang in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4561–4565 Titre : Catalytic hydrodechlorination of 4 - chlorophenol in an aqueous solution with Pd/Ni catalyst and formic acid Type de document : texte imprimé Auteurs : Shu Wang, Auteur ; Bo Yang, Auteur ; Tingting Zhang, Auteur Année de publication : 2010 Article en page(s) : pp. 4561–4565 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Aqueous  solution  Catalyst  Formic  acid Résumé : Palladized foam nickel (Pd/Ni) catalyst was prepared by replacement deposition and employed to hydrodechlorinate 4-chlorophenol (4-CP) with formic acid (FA). 4-CP was rapidly transformed to phenol by means of hydrogenolysis. Major factors that may influence the 4-CP conversion rate, including the Pd loading amount, FA dosage, and solution pH value, were investigated. A moderate Pd loading amount (1.0 wt %), an excess of FA dosage (FA/4-CP ratio of 51.4:1), and a relatively low pH (4.0) were found to be the optimal operational conditions under which 4-CP was degraded up to 96.2% within 2 h and the catalytic activity of Pd/Ni reduced negligibly after three recycles. The dechlorination pathway is postulated as follows: (1) HCOOH (or HCOO−) decomposed on Pd particles with atomic hydrogen ([H]) generated; (2) [H] served as the direct reducing agent in the hydrodechlorination of 4-CP adsorbed on both Pd particles and Ni substrate, through the radical mechanism. Pd/Ni is found to be a promising catalyst in the elimination of organochlorines. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9005194 [article] Catalytic hydrodechlorination of 4 - chlorophenol in an aqueous solution with Pd/Ni catalyst and formic acid [texte imprimé] / Shu Wang, Auteur ; Bo Yang, Auteur ; Tingting Zhang, Auteur . - 2010 . - pp. 4561–4565. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4561–4565 Mots-clés : Aqueous  solution  Catalyst  Formic  acid Résumé : Palladized foam nickel (Pd/Ni) catalyst was prepared by replacement deposition and employed to hydrodechlorinate 4-chlorophenol (4-CP) with formic acid (FA). 4-CP was rapidly transformed to phenol by means of hydrogenolysis. Major factors that may influence the 4-CP conversion rate, including the Pd loading amount, FA dosage, and solution pH value, were investigated. A moderate Pd loading amount (1.0 wt %), an excess of FA dosage (FA/4-CP ratio of 51.4:1), and a relatively low pH (4.0) were found to be the optimal operational conditions under which 4-CP was degraded up to 96.2% within 2 h and the catalytic activity of Pd/Ni reduced negligibly after three recycles. The dechlorination pathway is postulated as follows: (1) HCOOH (or HCOO−) decomposed on Pd particles with atomic hydrogen ([H]) generated; (2) [H] served as the direct reducing agent in the hydrodechlorination of 4-CP adsorbed on both Pd particles and Ni substrate, through the radical mechanism. Pd/Ni is found to be a promising catalyst in the elimination of organochlorines. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9005194