Journal ArticleDOI
In situ generation of Pd nanoparticles in MCM-41 and catalytic applications in liquid-phase alkyne hydrogenations
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In this article, two Pd-MCM-41 materials were synthetized by using the cationic surfactant tetradecyltrimethylammonium bromide (C 14 TABr) for both the stabilization of the Pd particles and the construction of the mesoporous structure.Abstract:
Pd–MCM-41 materials were synthetized by using the cationic surfactant tetradecyltrimethylammonium bromide (C 14 TABr) for both the stabilization of the Pd particles and the construction of the mesoporous structure of MCM-41. Two Pd–MCM-41 samples, for which the Pd particles were generated before and after formation of the MCM-41 framework (Pd-A and Pd-B, respectively), were investigated. Structural characterization of the samples was carried out by ICP-AES, N 2 sorption, XRD and TEM measurements. It was established that the highly ordered structure of MCM-41 was not appreciably affected by the formation of the Pd particles. Further, a similar particle size control was achieved for both Pd–MCM samples. However, both the location and the size distribution of the Pd particles were found to depend strongly on the preparation procedure. For Pd-A, the Pd nanoparticles were essentially situated on the external surface of MCM-41, whereas for Pd-B, the particles were found to be encapsulated inside the mesopores. For the liquid-phase hydrogenations of alkynes, the catalytic activity of Pd-A clearly surpassed that of Pd-B, indicating that the external Pd crystallites were more readily accessible for the reactants than those incorporated in the MCM-41 framework. The limited activity observed for Pd-B was attributed to mass transport limitations due to diffusion of the reactants into the mesopores of the MCM-41 host.read more
Citations
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Efficient, selective, and recyclable palladium catalysts in carbon-carbon coupling reactions.
TL;DR: C-C Couplings in Continuous Systems 2308 12.1.
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Palladium nanoparticles supported on MOF-5: A highly active catalyst for a ligand- and copper-free Sonogashira coupling reaction
TL;DR: Palladium nanoparticles supported on MOF-5 have been prepared by a chemical method at room temperature as mentioned in this paper, which exhibits efficient catalytic activity for the Sonogashira coupling reaction between aryl iodides and terminal acetylenes.
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Partial hydrogenation of propyne over copper-based catalysts and comparison with nickel-based analogues
TL;DR: In this article, the performance of copper-based catalysts derived from hydrotalcite and malachite precursors was compared with supported systems (Cu/Al 2 O 3 and Cu/SiO 2 ).
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Synthesis and catalytic application of Pd nanoparticles in graphite oxide
TL;DR: In this paper, Pd nanoparticles of 1-6nm were synthesized in graphite oxide (GO) via cation exchange and the resulting lowloaded Pd-GO material was characterized by X-ray diffraction (XRD), infrared (IR) spectroscopy and transmission electron microscopy (TEM).
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Selective hydrogenation of phenylacetylene over a nano-Pd/α-Al2O3 catalyst
TL;DR: In this article, a series of supported nano-Pd/α-Al 2 O 3 catalysts were prepared and applied to the selective hydrogenation of phenylacetylene.
References
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Journal ArticleDOI
Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Recommendations 1984)
TL;DR: Mise au point comportant des definitions generales et la terminologie, la methodologie utilisee, les procedes experimentaux, les interpretations des donnees d'adsorption, les determinations de l'aire superficielle, and les donnes sur la mesoporosite et la microporosite.
Journal ArticleDOI
Ordered mesoporous molecular sieves synthesized by a liquid-crystal template mechanism
TL;DR: In this paper, the synthesis of mesoporous inorganic solids from calcination of aluminosilicate gels in the presence of surfactants is described, in which the silicate material forms inorganic walls between ordered surfactant micelles.
Journal ArticleDOI
Ordered mesoporous materials in catalysis
Akira Taguchi,Ferdi Schüth +1 more
TL;DR: In this paper, a review of the preparation of ordered mesoporous catalysts is presented, and the essential properties of the resulting materials are described in the first part of this review.
Journal ArticleDOI
A neutral templating route to mesoporous molecular sieves.
TL;DR: A neutral templating route for preparing mesoporous molecular sieves is demonstrated based on hydrogen-bonding interactions and self-assembly between neutral primary amine micelles (S�) and neutral inorganic precursors (l�).
Journal ArticleDOI
Application of large pore MCM-41 molecular sieves to improve pore size analysis using nitrogen adsorption measurements
TL;DR: In this paper, it was shown that the Kelvin equation for the hemispherical meniscus, corrected for the statistical film thickness, is in quite good agreement with an experimental relation between the pore size and the capillary condensation pressure.
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