Author:
Morère Jacobo,Royuela Sergio,Asensio Guillermo,Palomino Pablo,Enciso Eduardo,Pando Concepción,Cabañas Albertina
Abstract
The deposition of Ni nanoparticles into porous supports is very important in catalysis. In this paper, we explore the use of supercritical CO
2
(scCO
2
) as a green solvent to deposit Ni nanoparticles on mesoporous SiO
2
SBA-15 and a carbon xerogel. The good transport properties of scCO
2
allowed the efficient penetration of metal precursors dissolved in scCO
2
within the pores of the support without damaging its structure. Nickel hexafluoroacetylacetonate hydrate, nickel acetylacetonate, bis(cyclopentadienyl)nickel, Ni(NO
3
)
2
⋅6H
2
O and NiCl
2
⋅6H
2
O were tried as precursors. Different methodologies were used: impregnation in scCO
2
and reduction in H
2
/N
2
at 400°C and low pressure, reactive deposition using H
2
at 200–250°C in scCO
2
and reactive deposition using ethanol at 150–200°C in scCO
2
. The effect of precursor and methodology on the nickel particle size and the material homogeneity (on the different substrates) was analysed. This technology offers many opportunities in the preparation of metal-nanostructured materials.
Subject
General Physics and Astronomy,General Engineering,General Mathematics
Cited by
19 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献