Evolution of the PVP–Pd Surface Interaction in Nanoparticles through the Case Study of Formic Acid Decomposition

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Title: Evolution of the PVP–Pd Surface Interaction in Nanoparticles through the Case Study of Formic Acid Decomposition
Authors: García Aguilar, Jaime | Navlani García, Miriam | Berenguer-Murcia, Ángel | Mori, Kohsuke | Kuwahara, Yasutaka | Yamashita, Hiromi | Cazorla-Amorós, Diego
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: PVP–Pd surface interaction | Nanoparticles | Formic acid decomposition
Knowledge Area: Química Inorgánica
Issue Date: 27-Oct-2016
Publisher: American Chemical Society
Citation: Langmuir. 2016, 32(46): 12110-12118. doi:10.1021/acs.langmuir.6b03149
Abstract: Palladium nanoparticles (Pd NPs) were synthesized by the reduction-by-solvent method using polyvinylpirrolidone (PVP) as capping agent. The nonstatic interaction between PVP and the metallic surface may change the properties of the NPs due to the different possible interactions, through either the O or N atoms of the PVP. In order to analyze these effects and their repercussions in their catalytic performance, Pd NPs with various PVP/Pd molar ratios (1, 10, and 20) were prepared, deposited on silica, and tested in the formic acid decomposition reaction. The catalytic tests were conducted using catalysts prepared by loading NPs with three different time lapses between their purification and their deposition on the silica support (1 day, 1 month, and 6 months). CO adsorption, FTIR spectroscopy, XPS, and TEM characterization were used to determine the accessibility of the Pd NPs surface sites, the electronic state of Pd, and the average NPs size, respectively. The H2 production from the formic acid decomposition reaction has a strong dependence on the Pd surface features, which in turn are related to the NPs aging time due to the progressive removal of the PVP.
Sponsor: We thank the Spanish Ministry of Economy and Competitiveness (MINECO), Generalitat Valenciana, and FEDER (Projects CTQ2015-66080-R MINECO/FEDER and PROMETEOII/2014/010) for financial support. J.G.A. thanks the MINECO for his fellowship (BES-2013-063678) and especially acknowledges the mobility grant of MINECO, EEBB-I-15-10219 at Osaka University.
URI: http://hdl.handle.net/10045/62492
ISSN: 0743-7463 (Print) | 1520-5827 (Online)
DOI: 10.1021/acs.langmuir.6b03149
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 American Chemical Society
Peer Review: si
Publisher version: http://dx.doi.org/10.1021/acs.langmuir.6b03149
Appears in Collections:INV - MCMA - Artículos de Revistas

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