R JavadKalbasi - Department of C hemistry, Islam ic Azad University, Shahrez a Branch, ۳۱۱-۸۶۱۴۵ Shahre za, Isfahan, Iran
H Johari - Department of C hemistry, Islam ic Azad University, Shahrez a Branch, ۳۱۱-۸۶۱۴۵ Shahre za, Isfahan, Iran

Palladium nanoparticles have become of increasing scienti¿c interest as cata lysts for carbon– carbo n bond-form ing reactio nsmethodologies in a dvanced org anic synthesis. In catalytic applications, a uniform dispersion of nan oparticles an d an effective control of particle si ze are usually expected.They must be embedde d in a matrix such as polymer or macromol ecular organic ligand.Ina ddition, to avoid the p roblems associated with metal nano particles such as homo geneity, recy clability, an d the separ ation of the catalyst from reaction sy stem, some other works have focus ed on immo bilizing metal nanoparticles on suita ble support materials su ch as immobilization in pores of het erogeneous supports like ordered mesoporous silica[۱].Ordered mesoporous silica m aterials ha ve received considerable attention because of their uniqu e structures with organiz ed porosity, high speci¿ c surface area, and spec i¿c pore volume, which make the m available to a wide range of a pplications in the are as of adsorption, separation, sensing, and catalysis. Amon g the mesoporous materials, materi als that cons ist of interc onnected large-pore cage-type meso porous systems with three-dimensional (۳D) porous networks are highly interesting and promise supports for heterogeneous catalysis. Among them, KIT-۵, is h ighly well-ordered cage type mes oporous with cubic Fm۳m close packed symmetry, high su rface area, l arge pores, and a high speci¿c pore volume [۲].

Pd nanoparticles, Poly(N-vinyl-۲-pyrrolidone),KIT-۵,mesoporoussilica.