Effect of Organic Modifiers on the Structure of Nickel Nanoparticles and Catalytic Activity in the Hydrogenation of p-Nitrophenol to p-Aminophenol

• Published in: Langmuir Vol. 25; no. 21; pp. 12736 - 12741
• Main Authors: Wang, Aili, Yin, Hengbo, Lu, Huihong, Xue, Jinjuan, Ren, Min, Jiang, Tingshun
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 03-11-2009
• Subjects: Catalysis; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Materials: Nano-and Mesostructured Materials, Polymers, Gels, Liquid Crystals, Composites; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Sorbitol; Nitro compound; Particle size; Catalytic reaction; Nanoparticle; Oxalate; Cationic surfactant; Alcohol; Raney nickel; Transition metal; Selectivity; Ionic surfactant; Hydrogenation; Citric acid; Quaternary ammonium compound; Phenols; Benzenic compound; Nickel; Hydrazine; Structure; Catalyst; Hydrates
• ISSN: 0743-7463; 1520-5827
• DOI: 10.1021/la901815b

Spherical nickel nanoparticles with different sizes and different structures were prepared starting from nickel oxalate and using hydrazine hydrate as a reductant in the presence of citric acid, cetyltrimethylammonium bromide, Tween 40, and d-sorbitol as organic modifiers. The size and structure of the resultant nickel nanoparticles were affected by using different organic modifiers. All of the nickel nanoparticles showed higher catalytic activity and selectivity than the conventional raney Ni catalyst in the hydrogenation of p-nitrophenol to p-aminophenol. Although the catalytic activities of the resultant nickel nanoparticles generally increased with decreasing particle size, the structure of nickel nanoparticles also had an important impact on the catalytic activity.