TY - GEN
T1 - Pd/WO3-ZrO2 catalysts
T2 - Nanotechnology 2013: Advanced Materials, CNTs, Particles, Films and Composites - 2013 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2013
AU - Chen, L. F.
AU - Ramirez Sebastian, S. P.
AU - Wang, J. A.
AU - Contreras, J. L.
PY - 2013
Y1 - 2013
N2 - Several 1 wt% Pd/WO3-ZrO2 catalysts were prepared using a sol-gel technique by varying WO3 content in 5, 10, 15 and 25 wt%. The crystalline structure, acidity, reducibility and morphologies were studied by XRD, FTIR, H2-TPR, STEM and Raman spectroscopic techniques. XRD analysis shows that the support oxides chiefly contain tetragonal zirconia together with WO3 phase on surface. With Raman spectroscopy, the surface structure of WO3 (800 cm-1 for W-0 bond, 268 cm-1 for W-O-W bonds, and 711 cm-1 for W=0 bond) are observed. In situ FTIR spectra confirm that both Lewis and Brønsted acid sites are present in the catalysts. In the hydroisomerization of n-heptane, the highest n-heptane conversion (60.8%) is obtained over 1 wt% Pd/WO3-ZrO2 with 25 wt% WO3 at 300 °C and the isomerization selectivity reaches 90%. Among the multibranched isomers, 2, 3- dimethylpentane is the main component.
AB - Several 1 wt% Pd/WO3-ZrO2 catalysts were prepared using a sol-gel technique by varying WO3 content in 5, 10, 15 and 25 wt%. The crystalline structure, acidity, reducibility and morphologies were studied by XRD, FTIR, H2-TPR, STEM and Raman spectroscopic techniques. XRD analysis shows that the support oxides chiefly contain tetragonal zirconia together with WO3 phase on surface. With Raman spectroscopy, the surface structure of WO3 (800 cm-1 for W-0 bond, 268 cm-1 for W-O-W bonds, and 711 cm-1 for W=0 bond) are observed. In situ FTIR spectra confirm that both Lewis and Brønsted acid sites are present in the catalysts. In the hydroisomerization of n-heptane, the highest n-heptane conversion (60.8%) is obtained over 1 wt% Pd/WO3-ZrO2 with 25 wt% WO3 at 300 °C and the isomerization selectivity reaches 90%. Among the multibranched isomers, 2, 3- dimethylpentane is the main component.
KW - Hydroisomerization
KW - N-heptane
KW - Pd/WO-ZrO catalysts
KW - Sol-gel
UR - http://www.scopus.com/inward/record.url?scp=84881088903&partnerID=8YFLogxK
M3 - Contribución a la conferencia
AN - SCOPUS:84881088903
SN - 9781482205817
T3 - Technical Proceedings of the 2013 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2013
SP - 479
EP - 482
BT - Technical Proceedings of the 2013 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2013
Y2 - 12 May 2013 through 16 May 2013
ER -