Speaker
Description
The controlled growth of Ni nanoparticles supported in zeolite Y (NiY) is of great interest, for example, by the petroleum industry due to its bifunctional characteristic (C-C bond breaking and hydrogenation-dehydrogenation function). Although there are several methods of NiY synthesis (precipitation, coprecipitation, solid state, among others), the method of synthesis by ion exchange and subsequent reduction by hydrogen is more convenient due to the ease implementation and growth control compared to the other methods previously mentioned. In this project, temperature-controlled growth of Ni nanoparticles supported in a Y zeolite (with Si/Al molar ratios of 15 and 40) was carried out using the aqueous ion exchange (first experimental stage) and reduction method with hydrogen gas (second experimental stage), characterizing each stage of the process both qualitatively and quantitatively. In the first experimental stage, the exchange time was varied from 15 to 60 days, carrying out a qualitative follow-up of the exchange by diffuse reflectance spectroscopy (DRS) and quantitative by spectroscopy with inductive coupling plasma (ICP). From the DRS, it was possible to determine the characteristic bands of nickel in the SI' and SII cationic zones of zeolite, finding a certain relationship with those reported by other authors (Lepetit & Che, 1996). On the other hand, through ICP analysis, it was possible to quantify the concentration of nickel in the exchanged samples, increasing proportionally with respect to the exchange time.
This work was supported by
CONAHCYT
Reference
Lepetit, C., & Che, M. (1996). Discussion on the Coordination of Ni 2+ Ions to Lattice Oxygens in Calcined Faujasite-Type Zeolites Followed by Diffuse Reflectance Spectroscopy. J. Phys. Chem., 100, 3137–3143.
| Keywords | zeolite Y, nickel, ionic, exchange, nanoparticles, |
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| Author will attend | I confirm |
