Intercalation of Sodium-Potassium Alloys Into Graphite

1998 ◽  
Vol 548 ◽  
Author(s):  
L. Antoine ◽  
J.C. Gachon ◽  
D. Guerard
Keyword(s):  
Alkali Metal ◽  
Metal Content ◽  
Room Temperature ◽  
Gas Purification ◽  
Sodium Potassium ◽  
Graphene Layers ◽  
Polymerization Catalyst ◽  
High Alkali ◽  
Intense Heat

ABSTRACTThe intercalation, at room temperature, of the sodium-potassium eutectic into graphite is performed, in a glove box under purified argon. It leads to a high alkali metal content powder. The annealing under vacuum, at 200°C for two days leads to a pure first stage compound whose formula is NaK2C12 with a color and a structure close to that of KC8. This phase is unstable and decomposes slowly in a mixture of KC8 and free alloy. However, this free alloy, which is liquid at room temperature, remains as inclusions between the graphene layers and the compound remains as a powder which can be useful for some applications when one needs large quantities of an alkali metal “solid” at room temperature, e.g. for gas purification (it reacts with oxygen and with moisture), for rapid and intense heat provider (it burns in air and the carbon is also participating to the heating), for ionic polymerization catalyst…

High Surface Area Activated Carbon Prepared from Black Liquor in the Presence of High Alkali Metal Content

2010 ◽  
Vol 43 (12) ◽  
pp. 1029-1034 ◽  
Author(s):  
Xiao-Yan Zhao ◽  
Jing-Pei Cao ◽  
Kazuyoshi Sato ◽  
Yukiko Ogawa ◽  
Takayuki Takarada
Keyword(s):  
Activated Carbon ◽  
Alkali Metal ◽  
Surface Area ◽  
Metal Content ◽  
High Surface ◽  
Black Liquor ◽  
High Surface Area ◽  
High Alkali

Effect of GR Granule Used as Bed Material to Reduce Agglomeration in BFB Combustion of Biomass with High Alkali Metal Content

2008 ◽  
pp. 705-712 ◽  
Author(s):  
J. H. Daavitsainen ◽  
R. S. Laitinen ◽  
L. H. Nuutinen ◽  
H. J. Ollila ◽  
M. S. Tiainen ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Metal Content ◽  
High Alkali ◽  
Bed Material

Room Temperature Alkali Metal Reduction of Carbon Dioxide

2020 ◽  
Author(s):  
Lucas A. Freeman ◽  
Akachukwu D. Obi ◽  
Haleigh R. Machost ◽  
Andrew Molino ◽  
Asa W. Nichols ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Alkali Metals ◽  
Room Temperature ◽  
Chemical Reduction ◽  
Bond Cleavage ◽  
Open Shell ◽  
Metal Reduction ◽  
One Pot ◽  
Earth Abundant ◽  
Electron Reduction

The reduction of the relatively inert carbon–oxygen bonds of CO<sub>2</sub> to access useful CO<sub>2</sub>-derived organic products is one of the most important fundamental challenges in synthetic chemistry. Facilitating this bond-cleavage using earth-abundant, non-toxic main group elements (MGEs) is especially arduous because of the difficulty in achieving strong inner-sphere interactions between CO<sub>2</sub> and the MGE. Herein we report the first successful chemical reduction of CO<sub>2</sub> at room temperature by alkali metals, promoted by a cyclic(alkyl)(amino) carbene (CAAC). One-electron reduction of CAAC-CO<sub>2</sub> adduct (<b>1</b>) with lithium, sodium or potassium metal yields stable monoanionic radicals clusters [M(CAAC–CO<sub>2</sub>)]<sub>n</sub>(M = Li, Na, K, <b> 2</b>-<b>4</b>) and two-electron alkali metal reduction affords open-shell, dianionic clusters of the general formula [M<sub>2</sub>(CAAC–CO<sub>2</sub>)]<sub>n </sub>(<b>5</b>-<b>8</b>). It is notable that these crystalline clusters of reduced CO<sub>2</sub> may also be isolated via the “one-pot” reaction of free CO<sub>2</sub> with free CAAC followed by the addition of alkali metals – a reductive process which does not occur in the absence of carbene. Each of the products <b>2</b>-<b>8</b> were investigated using a combination of experimental and theoretical methods.<br>

Room-Temperature Reduction of Sulfur Hexafluoride with Metal Phosphides

2021 ◽  
Author(s):  
Blake Stanley Norman Huchenski ◽  
Alexander William Harrison Speed
Keyword(s):  
Alkali Metal ◽  
Room Temperature ◽  
Sulfur Hexafluoride ◽  
Temperature Reduction ◽  
Metal Phosphides

Upon treatment with sulfur hexafluoride, alkali metal diphenyl or dicyclohexyl phosphides are oxidized within seconds to tetraphenyl or tetracyclohexyl diphosphines. When bulky di-tert-butylphosphide is employed, fluorophosphine intermediates are detected. This...

Trowelable Rubber Rocket Insulation for Use at 2800°C

1984 ◽  
Vol 57 (4) ◽  
pp. 843-854 ◽  
Author(s):  
J. G. Sommer
Keyword(s):  
Room Temperature ◽  
Loss Rate ◽  
Service Temperature ◽  
Material Loss ◽  
Blowing Agent ◽  
Unusual Combination ◽  
Novel Approaches ◽  
Glass Microballoons ◽  
Burning Propellant ◽  
Intense Heat

Abstract Ablative, trowelable rocket insulation was prepared; it crosslinks at room temperature and self-bonds to prevulcanized NBR insulation. The material loss rate (MLR) of this insulation is low when it is tested by an oxyacetylene torch at temperatures of about 2800°C. Boric acid in the insulation causes an effective char to form at service temperature. This char slows the loss rate of nondegraded insulation beneath it. Density of this nondegraded insulation is 1.3 g/cm3. Density is reduced sharply to 0.8 g/cm3 by incorporating glass microballoons. They cause only a slight increase in MLR of the insulation at service temperatures. MLR can be significantly reduced by incorporating a blowing agent which decomposes only after the insulation is exposed to service temperature. Hence, an unusual combination of requirements is met by several novel approaches. This insulation has protected rockets as large as 6.6 meters in diameter from the intense heat of burning propellant in service.

The crystal structures of solvent-free alkali-metal squarates from powder diffraction data

2005 ◽  
Vol 220 (11) ◽  
Author(s):  
Robert E. Dinnebier ◽  
Hanne Nuss ◽  
Martin Jansen
Keyword(s):  
High Resolution ◽  
Alkali Metal ◽  
Crystal Structures ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Room Temperature ◽  
Solvent Free ◽  
Crystallographic Data ◽  
Powder Diffraction Data ◽  
X Ray

AbstractThe crystal structures of solvent-free lithium, sodium, rubidium, and cesium squarates have been determined from high resolution synchrotron and X-ray laboratory powder patterns. Crystallographic data at room temperature of Li

Determination of the pH and the free alkali metal content in the pore solution of concrete: Review and experimental comparison

2017 ◽  
Vol 96 ◽  
pp. 13-26 ◽  
Author(s):  
G. Plusquellec ◽  
M.R. Geiker ◽  
J. Lindgård ◽  
J. Duchesne ◽  
B. Fournier ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Metal Content ◽  
Pore Solution ◽  
Free Alkali ◽  
Experimental Comparison

A Novel Alkali-Metal Hydrido-tris(pyrazolyl)borate (Tp*) Complex. Isolation and Crystal Structure of [(Me2CO)3(NaTp*)2]

2014 ◽  
Vol 69 (7) ◽  
pp. 793-798
Author(s):  
Laurent Plasseraud ◽  
Hélène Cattey
Keyword(s):  
Crystal Structure ◽  
Alkali Metal ◽  
Sodium Hydroxide ◽  
Title Compound ◽  
Room Temperature ◽  
Crystallographic Analysis ◽  
Monoclinic Space Group ◽  
Large Excess ◽  
X Ray ◽  
Acetone Water

The title compound was isolated from the treatment of Tp*Sn(Cl)2Bu (1) with a large excess of sodium hydroxide in a mixture of acetone-water at room temperature. [(Me2CO)3(NaTp*)2] (2) crystallizes at 4 °C as prismatic colorless crystals, in the monoclinic space group P21/c with Z = 4, a = 12.2837(6), b = 24.3197(12), c = 16.9547(8) Å, β = 110.017(1)°, and V = 4759.0(4) Å3. The X-ray crystallographic analysis revealed a dinuclear unit in which two Tp*Na moieties are held together by three bridging acetone molecules acting as oxygen-based donors.

ChemInform Abstract: Room Temperature Inorganic “Quasi-Molten Salts” as Alkali-Metal Electrolytes.

ChemInform ◽  
2010 ◽  
Vol 28 (12) ◽  
pp. no-no
Author(s):  
K. XU ◽  
S. ZHANG ◽  
C. A. ANGELL
Keyword(s):  
Alkali Metal ◽  
Molten Salts ◽  
Room Temperature
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