Synergistic effect of oxygen vacancies and highly dispersed Pd nanoparticles over Pd-loaded TiO2 prepared by a single-step sol–gel process for deoxygenation of triglycerides

2018 ◽  
Vol 566 ◽  
pp. 74-86 ◽  
Author(s):  
Tepin Hengsawad ◽  
Tossaporn Jindarat ◽  
Daniel E. Resasco ◽  
Siriporn Jongpatiwut
Keyword(s):  
Synergistic Effect ◽  
Oxygen Vacancies ◽  
Sol Gel ◽  
Pd Nanoparticles ◽  
Single Step ◽  
Sol Gel Process ◽  
Highly Dispersed ◽  
Effect Of Oxygen

Development by the sol–gel process of highly dispersed Ni–Cu/SiO2 xerogel catalysts for selective 1,2-dichloroethane hydrodechlorination into ethylene

2015 ◽  
Vol 209 ◽  
pp. 197-207 ◽  
Author(s):  
Sophie L. Pirard ◽  
Julien G. Mahy ◽  
Jean-Paul Pirard ◽  
Benoît Heinrichs ◽  
Laurent Raskinet ◽  
...  
Keyword(s):  
Sol Gel ◽  
Sol Gel Process ◽  
Highly Dispersed

Relaxor Behavior in Ba0.8Sr0.2TiO3/ZrO2 Heterostructured Thin Films

2012 ◽  
Vol 1454 ◽  
pp. 89-96 ◽  
Author(s):  
Santosh K. Sahoo ◽  
H. Bakhru ◽  
Sumit Kumar ◽  
D. Misra ◽  
Y. N. Mohapatra ◽  
...  
Keyword(s):  
Thin Films ◽  
Activation Energy ◽  
Oxygen Vacancies ◽  
Sol Gel ◽  
Single Layer ◽  
Relaxor Behavior ◽  
Bst Thin Films ◽  
Si Substrates ◽  
Sol Gel Process ◽  
Loss Maximum

ABSTRACTBa0.8Sr0.2TiO3 (BST) thin films and Ba0.8Sr0.2TiO3/ZrO2 heterostructured thin films have been successfully fabricated on Pt/Ti/SiO2/Si substrates by a sol-gel process. The dielectric properties of these films were measured as a function of temperature in the frequency range of 1 kHz to 1 MHz. It is clearly observed that the dielectric peaks exist and shift to high temperature with the increase of frequency indicating the presence of relaxor-type behavior in the films. Also it is seen that one dielectric peak is observed in single layer BST thin films whereas two dielectric peaks are observed in BST/ZrO2 heterostructured thin films due to the presence of two dielectric layers having different band gap energies. The variation of peak temperature Tm, corresponding to dielectric loss maximum, with frequency and fitting to Arrhenius law gives activation energy of 1.24 eV which is very close to the activation energy of oxygen vacancies in BaTiO3. Hence, oxygen vacancies are the active defects which are contributing to the relaxation process in these films.

Controlling the synergistic effect of oxygen vacancies and N dopants to enhance photocatalytic activity of N-doped TiO2 by H2 reduction

2012 ◽  
Vol 425-426 ◽  
pp. 117-124 ◽  
Author(s):  
Zizhong Zhang ◽  
Jinlin Long ◽  
Xiuqiang Xie ◽  
Huaqiang Zhuang ◽  
Yangen Zhou ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Oxygen Vacancies ◽  
Doped Tio2 ◽  
Effect Of Oxygen

Phase structure and thermal evolution in coatings and powders obtained by the sol-gel process: Part I. ZrO2−11.3 mol% Y2O3

1997 ◽  
Vol 12 (2) ◽  
pp. 493-500 ◽  
Author(s):  
P. C. Rivas ◽  
M. C. Caracoche ◽  
J. A. Martínez ◽  
A. M. Rodríguez ◽  
R. Caruso ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Thermal Evolution ◽  
Sol Gel ◽  
Correlation Spectroscopy ◽  
Cubic Phase ◽  
Perturbed Angular Correlation Spectroscopy ◽  
Heating And Cooling ◽  
Sol Gel Process ◽  
Fast Movement ◽  
Zirconia Powders

Yttria-stabilized cubic zirconia powders and coatings produced by the sol-gel method have been investigated by Perturbed Angular Correlation Spectroscopy (PAC). Results indicate that the metastable cubic phase is retained during heating and cooling cycles. The hyperfine interaction that describes this cubic phase, once crystallized, exhibits two components in a constant ratio of 4 : 1. The components represent different vacancy configurations. For the fast movement of oxygen vacancies starting at 750 °C, which is reflected by the damping of the hyperfine pattern, an activation energy of 0.96 eV was determined.

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