1,721,081 research outputs found
Molecular Probes for the Characterisation of Adsorption Sites in Micro- and Mesoporous Materials
No full textNew gold catalysts for liquid phase oxidation
Full text linkA pre-requisite for good catalytic activity with supported gold is that the metal is present as nanoparticles, but no suitable method for depositing gold on carbon as nanoparticles has previously been reported. The deposition precipitation method which has been used successfully for catalyst preparation with other supports, produces large aggregates with carbon. It is now shown, however, that pre-reduced gold sol is a satisfactory method for preparing gold on carbon catalysts as long as an appropriate choice of sol is made. In this paper the activity of gold on carbon catalysts prepared in a number of different ways is compared in a standardized liquid phase organic oxidation reaction. The activity for Au/C catalysts prepared by the sol method can show a two-fold increase compared with a similar catalyst prepared by deposition precipitation
Characterisation by vibrational and electronic spectroscopies
No full textThe EUROCAT SCR catalyst has been characterised by IR spectroscopic methods (transmission/absorption and diffuse reflectance techniques) by investigating its spectrum after different outgassing treatments, and the spectra of the surface species arising from adsorption of water (surface hydroxyl, groups), carbon monoxide, ammonia, pyridine, nitrogen monoxide, trimethyl berate and NO + NH3 coadsorptions. Additionally, Raman spectra and DR UV-Vis spectra have been reported after different outgassing treatments. The presence of Lewis and Bronsted acid sites has been discussed, as well as the evidence of different electronic states. A picture for the surface structure of the catalyst has been obtained. This picture is not significantly modified after extensive use of the catalyst in an SCR reactor for denitrifaction of flue gases from an incineration plant. (C) 2000 Elsevier Science B.V. All rights reserved
Characterisation of Microporous, and Mesoporous Materials by the Adsorption of Molecular Probes. FTIR and UV-Vis Studies
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Synthesis of Aminopropyl-silica Xerogels: Tuning of the Preparation Method for the Optimization of the Catalytic Performance in the Selective Synthesis of (E)-nitrostyrenes
No full textIntrazeolite large palladium clusters prepared by organometallic chemical vapour deposition.
No full textAlkali and alkaline-earth exchanged faujasites: strength of Lewis base and acid centres and cation site occupancy in Na- and BaY and Na- and BaX zeolites
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