Repositori URV

Identificador: imarina:9231660

Handle: https://hdl.handle.net/20.500.11797/imarina9231660

Autors:
Sanchez-Resa, DanielDelgado, Jorge AFernandez-Martinez, Maria DoloresDidelot, ChloeDe Mallmann, AimerySzeto, Kai CTaoufik, MostafaClaver, CarmenGodard, Cyril

Resum:
Triphenylphosphine stabilized Pd, Cu and PdCu nanocatalysts supported on carbon nanotubes (CNTs) or phosphorus functionalised silica (P-SiO2) were prepared via a one-pot methodology. The series of P-SiO2 supported catalysts evidenced metal particle sizes of metallic nanoparticles (M-NPs) between 1 and 2.4 nm, smaller than their equivalents on CNTs (2.4-2.6 nm). Such a difference in particle size as a function of the support and the metallic composition indicated the more pronounced mediation of the CNTs support during the formation of the M-NPs when compared to the P-SiO2 support. The series of supported catalysts were tested in the semi-hydrogenation of alkynes providing differences in reactivity which might be correlated with the size and composition of the M-NPs and the nature of corresponding support. The carbon supported catalysts displayed in general higher activities than those supported on silica and the bimetallic catalyst PdCu/CNTs were the most selective for the case of alkyl substituted alkynes. This catalyst could moreover be recycled several times without loss of activity nor selectivity.