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Journal of Nanotechnology
Volume 2013 (2013), Article ID 906740, 6 pages
http://dx.doi.org/10.1155/2013/906740
Research Article

PVP-Stabilized Palladium Nanoparticles in Silica as Effective Catalysts for Hydrogenation Reactions

Laboratory Catalysis and Inorganic Synthesis, School of Chemistry and Food, Federal University of Rio Grande, Avenue Itália, Km 08, 96201-900 Rio Grande, RS, Brazil

Received 9 August 2013; Accepted 11 November 2013

Academic Editor: John A. Capobianco

Copyright © 2013 Caroline Pires Ruas et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Palladium nanoparticles stabilized by poly (N-vinyl-2-pyrrolidone) (PVP) can be synthesized by corresponding Pd(acac)2 (acac = acetylacetonate) as precursor in methanol at 80°C for 2 h followed by reduction with NaBH4 and immobilized onto SiO2 prepared by sol-gel process under acidic conditions (HF or HCl). The PVP/Pd molar ratio is set to 6. The effect of the sol-gel catalyst on the silica morphology and texture and on Pd(0) content was investigated. The catalysts prepared (ca. 2% Pd(0)/SiO2/HF and ca. 0,3% Pd(0)/SiO2/HCl) were characterized by TEM, FAAS, and SEM-EDS. Palladium nanoparticles supported in silica with a size 6.6 ± 1.4 nm were obtained. The catalytic activity was tested in hydrogenation of alkenes.