Study by electrical conductivity measurements of semiconductive and redox properties of M-doped NiO (M = Li, Mg, Al, Ga, Ti, Nb) catalysts for the oxidative dehydrogenation of ethane

2014 ◽  
Vol 16 (10) ◽  
pp. 4962 ◽  
Author(s):  
Ionel Popescu ◽  
Eleni Heracleous ◽  
Zinovia Skoufa ◽  
Angeliki Lemonidou ◽  
Ioan-Cezar Marcu
Keyword(s):  
Electrical Conductivity ◽  
Oxidative Dehydrogenation ◽  
Redox Properties ◽  
Conductivity Measurements ◽  
Oxidative Dehydrogenation Of Ethane

A study by electrical conductivity measurements of the semiconductive and redox properties of Nb-doped NiO catalysts in correlation with the oxidative dehydrogenation of ethane

2015 ◽  
Vol 17 (12) ◽  
pp. 8138-8147 ◽  
Author(s):  
Ionel Popescu ◽  
Zinovia Skoufa ◽  
Eleni Heracleous ◽  
Angeliki Lemonidou ◽  
Ioan-Cezar Marcu
Keyword(s):  
Electrical Conductivity ◽  
Oxidative Dehydrogenation ◽  
Redox Properties ◽  
Conductivity Measurements ◽  
Oxidative Dehydrogenation Of Ethane ◽  
P Type

All the catalysts were partially reduced during catalysis and the ODH selectivity was inversely correlated with their p-type semiconductivity under the reaction mixture.

Study of the Redox Properties of Noble Metal/Co3O4 by Electrical Conductivity Measurements

2008 ◽  
Vol 124 (3-4) ◽  
pp. 318-323 ◽  
Author(s):  
Hongmin Duan ◽  
Dongyan Xu ◽  
Wenzhao Li ◽  
Hengyong Xu
Keyword(s):  
Electrical Conductivity ◽  
Noble Metal ◽  
Redox Properties ◽  
Conductivity Measurements

Total Body Electrical Conductivity Measurements in the Neonate

1991 ◽  
Vol 18 (3) ◽  
pp. 611-627 ◽  
Author(s):  
Marta L. Fiorotto ◽  
William J. Klish
Keyword(s):  
Electrical Conductivity ◽  
Conductivity Measurements ◽  
Total Body

Electrical conductivity studies on silica phases and the effects of phase transformation

2019 ◽  
Vol 104 (12) ◽  
pp. 1800-1805
Author(s):  
George M. Amulele ◽  
Anthony W. Lanati ◽  
Simon M. Clark
Keyword(s):  
Electrical Conductivity ◽  
Activation Volume ◽  
Activation Enthalpy ◽  
Hydrogen Charge ◽  
Charge Compensation ◽  
Composition Analysis ◽  
Conductivity Measurements ◽  
Pressure System ◽  
Electrical Conductivities ◽  
Silica Phases

Abstract Starting with the same sample, the electrical conductivities of quartz and coesite have been measured at pressures of 1, 6, and 8.7 GPa, respectively, over a temperature range of 373–1273 K in a multi-anvil high-pressure system. Results indicate that the electrical conductivity in quartz increases with pressure as well as when the phase change from quartz to coesite occurs, while the activation enthalpy decreases with increasing pressure. Activation enthalpies of 0.89, 0.56, and 0.46 eV, were determined at 1, 6, and 8.7 GPa, respectively, giving an activation volume of –0.052 ± 0.006 cm3/mol. FTIR and composition analysis indicate that the electrical conductivities in silica polymorphs is controlled by substitution of silicon by aluminum with hydrogen charge compensation. Comparing with electrical conductivity measurements in stishovite, reported by Yoshino et al. (2014), our results fall within the aluminum and water content extremes measured in stishovite at 12 GPa. The resulting electrical conductivity model is mapped over the magnetotelluric profile obtained through the tectonically stable Northern Australian Craton. Given their relative abundances, these results imply potentially high electrical conductivities in the crust and mantle from contributions of silica polymorphs. The main results of this paper are as follows:The electrical conductivity of silica polymorphs is determined by impedance spectroscopy up to 8.7 GPa.The activation enthalpy decreases with increasing pressure indicating a negative activation volume across the silica polymorphs.The electrical conductivity results are consistent with measurements observed in stishovite at 12 GPa.

Oxidative dehydrogenation of ethane to ethylene on the carbocatalyst

2020 ◽  
Author(s):  
O. A. Knyazheva ◽  
O. N. Baklanova ◽  
S. S. Sigaeva ◽  
A. V. Lavrenov ◽  
D. A. Shlyapin
Keyword(s):  
Oxidative Dehydrogenation ◽  
Oxidative Dehydrogenation Of Ethane
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