Interactions between metal cations and the ionophore lasalocid. Part 10.—Gibbs functions, enthalpies, entropies and volumes for proton–alkali-metal cation exchange in a water–chloroform system

1992 ◽  
Vol 88 (7) ◽  
pp. 1009-1015 ◽  
Author(s):  
Rachid Lyazghi ◽  
Marc Hebrant ◽  
Madeleine Tissier ◽  
Yvon Pointud ◽  
Jean Juillard
Keyword(s):  
Alkali Metal ◽  
Cation Exchange ◽  
Metal Cation ◽  
Alkali Metal Cation ◽  
Metal Cations

Alkali metal cation exchange of HZSM-5 and the catalytic properties of the alkalized zeolites

1991 ◽  
Vol 68 (1) ◽  
pp. 31-39 ◽  
Author(s):  
C.P. Nicolaides ◽  
M. Wapiennik ◽  
K.I.G. Weiss ◽  
H. van den Akker ◽  
B. van Zalk ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Cation Exchange ◽  
Metal Cation ◽  
Catalytic Properties ◽  
Alkali Metal Cation

scholarly journals The effect of the alkali metal cation on the electrocatalytic oxidation of formate on platinum

RSC Advances ◽  
2014 ◽  
Vol 4 (29) ◽  
pp. 15271-15275 ◽  
Author(s):  
Bruno A. F. Previdello ◽  
Eduardo G. Machado ◽  
Hamilton Varela
Keyword(s):  
Alkali Metal ◽  
Metal Cation ◽  
Electrocatalytic Oxidation ◽  
Alkali Metal Cation ◽  
Metal Cations ◽  
Alkali Metal Cations ◽  
Non Covalent Interactions ◽  
Electro Oxidation ◽  
Covalent Interactions

Non-covalent interactions between hydrated alkali metal cations and oxygenated species on platinum considerably impact the mechanism of formate electro-oxidation.

Acid-based co-catalysis for oxidative dehydrogenation of ethylbenzene to styrene with CO2 over X zeolite modified by alkali metal cation exchange

RSC Advances ◽  
2015 ◽  
Vol 5 (92) ◽  
pp. 75787-75793 ◽  
Author(s):  
Guoqing Zhao ◽  
Huanhui Chen ◽  
Junhui Li ◽  
Qunlong Wang ◽  
Yanan Wang ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Cation Exchange ◽  
Oxidative Dehydrogenation ◽  
Metal Cation ◽  
Alkali Metal Cation ◽  
X Zeolite ◽  
X Zeolites ◽  
Dehydrogenation Of Ethylbenzene ◽  
Oxidative Dehydrogenation Of Ethylbenzene ◽  
First Time

A variety of the modified X zeolites were used to catalyse the oxidative dehydrogenation of ethylbenzene to styrene with CO2 for the first time.

Crystal Structures of Titanium(III) Bis(acetylide) Tweezer Complexes with Alkali Metal Cations

1997 ◽  
Vol 62 (9) ◽  
pp. 1446-1456 ◽  
Author(s):  
Jörg Hiller ◽  
Vojtech Varga ◽  
Ulf Thewalt ◽  
Karel Mach
Keyword(s):  
Alkali Metal ◽  
Crystal Structures ◽  
Metal Cation ◽  
Alkali Metal Cation ◽  
Metal Cations ◽  
Polymer Chains ◽  
Alkali Metal Cations ◽  
Bonding Interaction ◽  
Intermolecular Bonding ◽  
Trimethylsilyl Groups

Crystal structures of the Ti(III) tweezer complexes [(C5HMe4)2Ti(σ-C≡CSiMe3)2]-[Li(THF)2]+ (2a), [(C5HMe4)2Ti(σ-C≡CSiMe3)2]-Na+ (3) and [(C5HMe4)2Ti(σ-C≡CSiMe3)2]-Cs+ (5) have been determined. In all of them the alkali metal cation is placed away from the Ti-Cα1-Cα2 plane at the distance: Li+ 0.511 Å, Na+ 1.023 Å and Cs+ 0.521 Å. The reason for the deviation of Li+ in 2a is the asymmetrical orientation of the THF ligands in the [Li(THF)2]+ cation with respect to the Ti-Cα1-Cα2 plane, which seems to release the steric congestion between the THF ligands and the trimethylsilyl groups. In 3 and 5, the molecules form polymer chains with a weak intermolecular bonding interaction between the cations and one of the C5HMe4 ligands of the neighbouring molecule in a sandwich manner.

CO2 adsorption in Y and X zeolites modified by alkali metal cation exchange

2006 ◽  
Vol 91 (1-3) ◽  
pp. 78-84 ◽  
Author(s):  
Krista S. Walton ◽  
Morgan B. Abney ◽  
M. Douglas LeVan
Keyword(s):  
Alkali Metal ◽  
Cation Exchange ◽  
Metal Cation ◽  
Co2 Adsorption ◽  
Alkali Metal Cation ◽  
X Zeolites

Study of photocatalytic reaction of methanol with water over Rh-, and Pd-loaded TiO2 catalysts. The role of added alkali metal cations

1986 ◽  
Vol 64 (9) ◽  
pp. 1795-1799 ◽  
Author(s):  
Shuichi Naito
Keyword(s):  
Alkali Metal ◽  
Metal Cation ◽  
Methyl Formate ◽  
Alkali Metal Cation ◽  
Metal Cations ◽  
Photocatalytic Reaction ◽  
Product Selectivity ◽  
Alkali Metal Cations ◽  
Selectivity Change

The product selectivity of the photocatalytic reaction of methanol with water is changed drastically by the addition of alkali metal cations to Rh- and Pd-loaded TiO2 catalysts. Over alkali metal cation free catalysts, the main products are 1:1 ratio of H2 and dimethoxymethane, which is replaced with H2, methyl formate, and CO2 over alkali metal cation added catalysts. The role of added alkali metal cations is the stabilization of the reaction intermediate as adsorbed formate instead of adsorbed formaldehyde, which causes the selectivity change from dimethoxymethane to methyl formate.

scholarly journals Alkali Metal Cation Transport and Homeostasis in Yeasts

2010 ◽  
Vol 74 (1) ◽  
pp. 95-120 ◽  
Author(s):  
Joaquín Ariño ◽  
José Ramos ◽  
Hana Sychrová
Keyword(s):  
Plasma Membrane ◽  
Alkali Metal ◽  
Metal Cation ◽  
Higher Plants ◽  
Alkali Metal Cation ◽  
Metal Cations ◽  
Cation Transport ◽  
Transport Processes ◽  
Alkali Metal Cations ◽  
Yeast Saccharomyces Cerevisiae

SUMMARY The maintenance of appropriate intracellular concentrations of alkali metal cations, principally K+ and Na+, is of utmost importance for living cells, since they determine cell volume, intracellular pH, and potential across the plasma membrane, among other important cellular parameters. Yeasts have developed a number of strategies to adapt to large variations in the concentrations of these cations in the environment, basically by controlling transport processes. Plasma membrane high-affinity K+ transporters allow intracellular accumulation of this cation even when it is scarce in the environment. Exposure to high concentrations of Na+ can be tolerated due to the existence of an Na+, K+-ATPase and an Na+, K+/H+-antiporter, which contribute to the potassium balance as well. Cations can also be sequestered through various antiporters into intracellular organelles, such as the vacuole. Although some uncertainties still persist, the nature of the major structural components responsible for alkali metal cation fluxes across yeast membranes has been defined within the last 20 years. In contrast, the regulatory components and their interactions are, in many cases, still unclear. Conserved signaling pathways (e.g., calcineurin and HOG) are known to participate in the regulation of influx and efflux processes at the plasma membrane level, even though the molecular details are obscure. Similarly, very little is known about the regulation of organellar transport and homeostasis of alkali metal cations. The aim of this review is to provide a comprehensive and up-to-date vision of the mechanisms responsible for alkali metal cation transport and their regulation in the model yeast Saccharomyces cerevisiae and to establish, when possible, comparisons with other yeasts and higher plants.

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