"Nanotechnology and Nanomaterials"

Preparation of SBA-15 Supported Pd Nanoparticles Using Supercritical Carbon Dioxide Deposition Method
Burcu Tezcan and Bilgehan Güzel
1Chemistry Department, University of Cukurova , 01330, Adana, TURKEY. 
E-mail: burcudarendeli@gmail.com
Supported metals are frequently used in catalysis. Supported materials for catalyst are generally metals which are dispersed atomically or as nanoparticles on the internal surface of a support material. Using supercritical fluids (SCFs) to deposit metals on surfaces has been attracting increased. The advantages of using supercritical carbon dioxide (scCO2) as deposition media can be summarized as: solvent power can be adjusted with changes in pressure and temperature, no solvent residue is left on the substrate, cheap, environmentally acceptable and has relatively low critical temperature and pressure (Tc =31°C, Pc = 73.8 bar). Few number of suitable precursor have been known for use in SFD technique and the inadequacy of existing ligands with transition metals is one of the most important factor that limit this method. 

In this work; the first step,  anti and amphi vic-dioxime ligands were synthesized by starting with fluorinated anilines at different positions and vic-glyoxime. Then their Pd(II) metal complexes (precursors) were prepared. In second step, precursors were deposited on to the SBA-15 by SCFD. This process was carried out at pressure of 145 psi H2 and 2855 psi CO2 and a temperature of 80°C. In the last step of this work, SBA-15 supported metal nanoparticles’ catalytic activity was tested at Suzuki-Miyaura reactions.
Acknowledgements This work was supported by the Scientific and Technological Research Council of Turkey (TUBITAK, 214Z097).
1.	Erkey C., Preparation of metallic supported nanoparticles and films using supercritical fluid deposition // The Journal of Supercritical Fluids- 2009.-3.-P. 517–522.