Journal ArticleDOI
Pd supported on tetragonal zirconia: Electrosynthesis, characterization and catalytic activity toward CO oxidation and CH4 combustion
M. Faticanti,Nicola Cioffi,Sergio De Rossi,Nicoletta Ditaranto,Piero Porta,Luigia Sabbatini,Teresa Bleve-Zacheo +6 more
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In this paper, a sacrificial anode electrosynthesis route was used to obtain catalysts made of Pd supported on ZrO2, which were tested for CH4 total combustion and for CO oxidation.Abstract:
Catalysts made of Pd supported on ZrO2 were prepared via a sacrificial anode electrosynthesis route. Tetragonal zirconia was added to an electrolytic cell assembled for the preparation of colloidal Pd nanoparticles. Several samples were prepared varying the electrolysis time and thus the Pd loading in the nanocomposite. XRD analysis showed the presence of the tetragonal ZrO2 mainly and some small reflections due to monoclinic ZrO2. BET surface areas were in the range 70–80 m2 g−1. The morphology and surface chemical composition of the nano-materials were, respectively, assessed by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) analyses. From TEM evidence, the Pd-ZrO2 powders revealed to be composed of spherical Pd nanoparticles (average core diameter: 6.9 ± 1.8 nm) evenly dispersed on the surface of ZrO2 nano-grains (average grain size: 150 ± 70 nm, average size of crystallites composing each grain: 40 ± 10 nm). XPS allowed to quantify the surface elemental composition of the nanomaterials and to study the different chemical states of the nano-dispersed palladium. Catalysts were tested for CH4 total combustion and for CO oxidation. The conversion increased with Pd content in the CH4 combustion experiments whereas decreased with Pd content in the CO oxidation experiments. The apparent activation energies were about 25 and 9 kcal mol−1 for CH4 combustion and CO oxidation, respectively. Hypothesis was made that different reaction mechanisms and different active sites were probably involved in the two reactions.read more
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Journal ArticleDOI
Sustainable Preparation of Supported Metal Nanoparticles and Their Applications in Catalysis
TL;DR: The state of the art with respect to the preparation and use of supported metal nanoparticles in catalysis is described, the main groups of such nanoparticles (noble and transitionMetal nanoparticles) are highlighted and future prospects are discussed.
Journal ArticleDOI
Support Morphology-Dependent Catalytic Activity of Pd/CeO2 for Formaldehyde Oxidation
TL;DR: To eliminate indoor formaldehyde (HCHO) pollution, Pd/CeO2 catalysts with different morphologies of ceria support were employed and the nanorods with more defect sites and oxygen vacancies were responsible for the easy oxidation of the Pd-species and low catalytic activity.
Journal ArticleDOI
Pd electrocatalyst supported on carbonized TiO2 nanotube for ethanol oxidation
TL;DR: In this paper, a Pd/TiO2C electrocatalyst with the 1:1 mass ratio of Pd to TiO 2C was used for ethanol oxidation in alkaline media.
Journal ArticleDOI
Cellulose supported palladium(0) catalyst for Heck and Sonogashira coupling reactions
TL;DR: In this paper, a cellulose supported palladium(0) catalyst was used for Heck and Sonogashira coupling reactions by treating aryl iodides with alkenes and phenylacetylene, respectively, to afford corresponding coupled products in good to excellent yields.
Journal ArticleDOI
Synthesis, analytical characterization and bioactivity of Ag and Cu nanoparticles embedded in poly-vinyl-methyl-ketone films
Nicola Cioffi,Nicoletta Ditaranto,Luisa Torsi,Rosaria Anna Picca,E. De Giglio,Luigia Sabbatini,L. Novello,Giuseppina Tantillo,Teresa Bleve-Zacheo,Pier Giorgio Zambonin +9 more
TL;DR: The electrosynthesis of copper and silver core-shell nanoparticles (NPs) by the sacrificial anode technique, employing tetraoctylammonium (TOA) salts as base electrolyte for the first time, is described, demonstrating the high efficiency of the surfactant at controlling the morphology and the chemical composition of the nanodispersed metal.
References
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Reference BookDOI
Handbook of Heterogeneous Catalysis
TL;DR: This paper presents a meta-modelling system that automates the very labor-intensive and therefore time-heavy and therefore expensive and expensive process of characterization and activation of Solid Catalysts.
Journal ArticleDOI
Catalytic removal of NO
TL;DR: In this paper, the authors review the catalytic reactions for the removal of NO and discuss the reduction of NO in the presence of NH3, CO, H-2 or hydrocarbons as well as the decomposition of NO.
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