TY - JOUR
T1 - Structural analysis of platinum-palladium nanoparticles dispersed on titanium dioxide to evaluate cyclo-olefines reactivity
AU - Castillo, N.
AU - Pérez, R.
AU - Martínez-Ortiz, M. J.
AU - Díaz-Barriga, L.
AU - García, L.
AU - Conde-Gallardo, A.
N1 - Funding Information:
Authors wish to thank Luis Rendon and Angel Flores from IFUNAM for technical assistance in Electron Microscopy. Also wish to thank to CONACYT for scholarship 154071 , CONACYT 61597 and SIP 20082453 , 20090868 projects for financial support.
PY - 2010/4/16
Y1 - 2010/4/16
N2 - Structural and chemical properties were correlated to explain catalytic behavior of Pt-Pd/TiO2 in a cyclo-olefin reaction. Bimetallic nanoparticles supported on TiO2 were prepared by wetness impregnation techniques at different concentrations of Pt and Pd ≈1 metallic wt%. The physicochemical properties of these metallic nanoparticles supported on TiO2 were characterized by N2 physisorption (Brunauer-Emmett-Teller-BET), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The relationship between chemical composition, physicochemical properties and particle size on the cyclo-olefin reaction was then studied. XRD and TEM results show that these nanoparticles are composed of Pt-Pd with FFC structure (a = 0.389-0.391 nm) supported on TiO2 (anatase-like structure), and the materials present tetragonal structure nanoparticles (a = 0.37842, b = 0.37842, c = 0.95146 nm). Samples with higher contents of platinum and particle sizes of 4.2 nm show the highest catalytic conversion in cyclo-olefins reaction. Finally, structural examinations of Ptx-Pd(1-x)/TiO2 based system was then conducted to study the effects of metals on the nanostructure of the materials.
AB - Structural and chemical properties were correlated to explain catalytic behavior of Pt-Pd/TiO2 in a cyclo-olefin reaction. Bimetallic nanoparticles supported on TiO2 were prepared by wetness impregnation techniques at different concentrations of Pt and Pd ≈1 metallic wt%. The physicochemical properties of these metallic nanoparticles supported on TiO2 were characterized by N2 physisorption (Brunauer-Emmett-Teller-BET), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The relationship between chemical composition, physicochemical properties and particle size on the cyclo-olefin reaction was then studied. XRD and TEM results show that these nanoparticles are composed of Pt-Pd with FFC structure (a = 0.389-0.391 nm) supported on TiO2 (anatase-like structure), and the materials present tetragonal structure nanoparticles (a = 0.37842, b = 0.37842, c = 0.95146 nm). Samples with higher contents of platinum and particle sizes of 4.2 nm show the highest catalytic conversion in cyclo-olefins reaction. Finally, structural examinations of Ptx-Pd(1-x)/TiO2 based system was then conducted to study the effects of metals on the nanostructure of the materials.
KW - Nanoparticles Pd-Pt
KW - TEM
KW - XRD
UR - http://www.scopus.com/inward/record.url?scp=77950943602&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2009.11.161
DO - 10.1016/j.jallcom.2009.11.161
M3 - Artículo
SN - 0925-8388
VL - 495
SP - 453
EP - 457
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 2
ER -