Pd nanoparticles embedded into a metal-organic framework: synthesis, structural characteristics, and hydrogen sorption properties.
The metal-organic framework MIL-100(Al) has been used as a host to synthesize Pd nanoparticles (around 2.0 nm) embedded within the pores of the MIL, showing one of the highest metal contents (10 wt %) without degradation of the porous host. Textural properties of MIL-100(Al) are strongly modified by Pd insertion, leading to significant changes in gas sorption properties. The loss of excess hydrogen storage at low temperature can be correlated with the decrease of the specific surface area and pore volume after Pd impregnation. At room temperature, the hydrogen uptake in the composite MIL-100(Al)/Pd is almost twice that of the pristine material. This can be only partially accounted by Pd hydride formation, and a "spillover" mechanism is expected to take place promoting the dissociation of molecular hydrogen at the surface of the metal nanoparticles and the diffusion of monatomic hydrogen into the porosity of the host metal-organic framework.
Institut de Chimie et des Materiaux de Paris-Est, CNRS UMR 7182, 2-8, Rue Henri Dunant, 94320 Thiais, France.
Claudia
C
Zlotea
Renato
R
Campesi
Fermin
F
Cuevas
Eric
E
Leroy
Philippe
P
Dibandjo
Christophe
C
Volkringer
Thierry
T
Loiseau
Gérard
G
Férey
Michel
M
Latroche
D000327:Adsorption; D017607:Aluminum Compounds / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D013499:Surface Properties
D017607:Aluminum Compounds; D009942:Organometallic Compounds; D010165:Palladium; D006859:Hydrogen