Activation energy for alkaline-earth ion transport in low alkali aluminoborosilicate glasses

2013 ◽  
Vol 102 (8) ◽  
pp. 082904 ◽  
Author(s):  
Priyanka Dash ◽  
Eugene Furman ◽  
Carlo G. Pantano ◽  
Michael T. Lanagan
Keyword(s):  
Activation Energy ◽  
Ion Transport ◽  
Alkaline Earth

scholarly journals Kinetic study of wood pyrolysis in presence of metal halides

2014 ◽  
Vol 12 (12) ◽  
pp. 1294-1303 ◽  
Author(s):  
Vladimir Beliy ◽  
Elena Udoratina
Keyword(s):  
Activation Energy ◽  
Lewis Acids ◽  
Alkaline Earth ◽  
Reaction Order ◽  
Earth Metal ◽  
Inorganic Salts ◽  
Alkaline Earth Metal ◽  
Metal Halides ◽  
Wood Pyrolysis ◽  
Kinetics Of

AbstractThe purpose of this work was to study the kinetics of wood pyrolysis in the presence of inorganic salts, representatives of classes of alkali and alkaline earth metal halides (NaCl, KCl, KBr, CaCl2, BaCl2·2H2O) and Lewis acids (AlCl3·6H2O, FeCl3·6H2O, CuCl2, CuBr2, ZnCl2·1.5H2O, NiCl2·6H2O, SnCl2·2H2O) using TG-DSC. The activity of these catalysts was estimated by the temperature of the beginning of pyrolysis, charcoal yield and kinetic parameters, such as energy of activation and reaction order. Using the Lewis acids as catalysts for pyrolysis leads to a decrease in the temperature of the process beginning and the activation energy. In the presence of other catalysts activation energy does not significantly change. The increase of a seeming reaction order in the presence of Lewis acids possibly is a consequence of complication of the thermodestruction mechanism, with the appearance of new parallel competing stages.

Activation Energy−Activation Volume Master Plots for Ion Transport Behavior in Polymer Electrolytes and Supercooled Molten Salts

2005 ◽  
Vol 109 (35) ◽  
pp. 16567-16570 ◽  
Author(s):  
Malcolm D. Ingram ◽  
Corrie T. Imrie ◽  
Zlatka Stoeva ◽  
Steven J. Pas ◽  
Klaus Funke ◽  
...  
Keyword(s):  
Activation Energy ◽  
Ion Transport ◽  
Polymer Electrolytes ◽  
Molten Salts ◽  
Activation Volume ◽  
Transport Behavior ◽  
Master Plots ◽  
Energy Activation

Effective energy landscapes for mobile ions in solid electrolytes

2004 ◽  
Vol 835 ◽  
Author(s):  
Stefan Adams
Keyword(s):  
Activation Energy ◽  
Ion Transport ◽  
Solid Electrolytes ◽  
Transport Mechanism ◽  
Bond Valence ◽  
Trivalent Cation ◽  
Effective Energy ◽  
Energy Landscapes ◽  
Mobile Species ◽  
Mobile Ions

ABSTRACTBond valence mismatch landscapes may serve as simple models of the effective energy landscapes for mobile ions in solid electrolytes. Thereby they provide a tool to identify the ion transport mechanism and allow to predict the activation energy of the ionic conduction. Accounting for the mass dependence of the conversion from the BV mismatch into an activation energy scale yields a correlation that holds for different types of mobile cations. While in most cases the analysis of bond valence mismatch landscapes is consistent with the ion transport mechanism derived from experimental or other computational evidence, the presumed prototype of trivalent cation conductors Sc2(WO4)3 is discussed as an example, where the BV analysis of transport pathways suggests that the interpretation of previous experimental investigations has to be reconsidered. Both bond valence calculations and molecular dynamics simulations suggests that the most probable mobile species in stoichiometric Sc2(WO4)3 is neither Sc3+ nor individual O2- but the complex divalent anion WO42-.

Effet des cations extra-réseau de la zéolithe Y sur l’activité catalytique du palladium dans la réaction de combustion du méthane

2009 ◽  
Vol 87 (6) ◽  
pp. 706-713 ◽  
Author(s):  
Mongia Saïd Zina ◽  
Lobna Bassalah ◽  
Abdelhamid Ghorbel
Keyword(s):  
Activation Energy ◽  
Oxidation State ◽  
Alkaline Earth ◽  
Active Catalyst ◽  
Earth Metal ◽  
Metal Cations ◽  
Alkaline Earth Metal ◽  
Pd Catalysts ◽  
Basic Properties ◽  
Supported Palladium

Alkali and alkaline earth metal cations were introduced into zeolite to explore their influence on the activity of supported palladium in the total combustion of methane and to study how the acido-basic properties of the support affected the structure and the oxidation state of Pd. The results show that all samples exhibit a slight activation with time. Moreover, at temperatures below 430 °C, PdLiNaY seems to be the most active catalyst, while PdHY is the most active sample at higher temperatures. Except for PdHY, all Pd catalysts lead to an activation energy (Ea) value in the range of 79–97 kJ mol–1.

Activation energy of sulfate ion transport across methylated human erythrocyte membranes

FEBS Letters ◽  
1988 ◽  
Vol 236 (1) ◽  
pp. 93-94 ◽  
Author(s):  
Teresa Janas ◽  
Tadeusz Janas ◽  
Mieczysław Kilian ◽  
Stanisław Przestalski
Keyword(s):  
Activation Energy ◽  
Ion Transport ◽  
Human Erythrocyte ◽  
Erythrocyte Membranes ◽  
Sulfate Ion ◽  
Human Erythrocyte Membranes

Modification of Kemp’s Triacid to Produce New Ligands Showing Efficient Alkaline Earth Metal Ion Transport with Structure Dependent Selectivity

1996 ◽  
Vol 25 (6) ◽  
pp. 415-416 ◽  
Author(s):  
Bruce W. Baldwin ◽  
Takuji Hirose ◽  
Zhen-He Wang ◽  
Tadafumi Uchimaru ◽  
Ari Yliniemelä
Keyword(s):  
Ion Transport ◽  
Metal Ion ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Kemp's Triacid ◽  
Metal Ion Transport

Kinetic understanding of the effect of Na and Mg on pyrolytic behavior of lignin using a distributed activation energy model and density functional theory modeling

2019 ◽  
Vol 21 (5) ◽  
pp. 1099-1107 ◽  
Author(s):  
Kwang Ho Kim ◽  
Keunhong Jeong ◽  
Seung-Soo Kim ◽  
Robert C. Brown
Keyword(s):  
Activation Energy ◽  
Density Functional Theory ◽  
Density Functional ◽  
Alkaline Earth ◽  
Catalytic Effect ◽  
Energy Model ◽  
Alkaline Earth Metals ◽  
Distributed Activation Energy Model ◽  
Functional Theory ◽  
Naturally Occurring

The catalytic effect of Na and Mg, naturally occurring alkali and alkaline earth metals, on lignin pyrolysis was systematically analyzed using a distributed activation energy model and computational modeling.

scholarly journals Effect of the Electric Double Layer on the Activation Energy of Ion Transport in Conical Nanopores

2015 ◽  
Vol 119 (43) ◽  
pp. 24299-24306 ◽  
Author(s):  
Rukshan T. Perera ◽  
Robert P. Johnson ◽  
Martin A. Edwards ◽  
Henry S. White
Keyword(s):  
Activation Energy ◽  
Ion Transport ◽  
Double Layer ◽  
Electric Double Layer ◽  
Conical Nanopores

scholarly journals EFFECT OF TEMPERATURE ON ELECTROLYTE METABOLISM OF ISOLATED FROG SKIN

1959 ◽  
Vol 42 (3) ◽  
pp. 525-531 ◽  
Author(s):  
Ernst G. Huf ◽  
Norma S. Doss
Keyword(s):  
Activation Energy ◽  
Oxygen Consumption ◽  
Ion Transport ◽  
Frog Skin ◽  
Electrolyte Composition ◽  
Effect Of Temperature ◽  
O2 Consumption ◽  
Electrolyte Metabolism ◽  
Nacl Transport ◽  
Active Ion Transport

A study is presented on the effect of temperature on unidirectional active ion transport, resting electrolyte equilibrium (electrolyte composition), and oxygen consumption in isolated frog skin. The aims were twofold: first, to find out whether the rate of active transport can be changed without affecting the Na+ and K+ balance of skin itself; second, to arrive at minimal ΔNa/ΔO2 values by correlating quantitatively inhibition of active ion transport with inhibition of O2 consumption. NaCl transport was maximal at 20°C. At 28° and at temperatures below 20°, rate of NaCl transport was diminished. In many instances NaCl transport was diminished in skins which maintained their normal Na+ and K+ content. In several cases, however, neither rate of transport nor resting electrolyte equilibrium was affected; in other cases, both were. O2 consumption decreased when lowering the temperature over the range from 28 to 10°C. From a plot of log QOO2 against 1/T an activation energy of µ 13,700 cal. was calculated, valid for the range from 10 to 20°C. It appeared that µ was smaller for temperatures above 20°C. Working between 10 and 20°, it was found that, on the average, 4 to 5 equivalents of Na+ were transported for one mole of O2 consumed in skins with undisturbed resting electrolyte equilibrium.

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