The reduction of uranium hexafluoride by hydrogen at room temperature

1973 ◽  
Vol 26 (12) ◽  
pp. 2711 ◽  
Author(s):  
JH Levy ◽  
PW Wilson
Keyword(s):  
Hydrogen Fluoride ◽  
Room Temperature ◽  
Uranium Hexafluoride ◽  
Platinum Metal ◽  
Laboratory Scale ◽  
Catalysed Reaction

The reaction between uranium hexafluoride and hydrogen is catalysed by hydrogen fluoride, especially in the presence of platinum metal. The catalysed reaction has an observable rate at room temperature. The reaction provides the basis for the preparation of β-uranium pentafluoride on a laboratory scale.

Environmental Cracking of High Strength Maraging Steels: Part 2—Gaseous Fluoride Atmospheres

CORROSION ◽  
1981 ◽  
Vol 37 (2) ◽  
pp. 63-70
Author(s):  
D. H. Bradhurst ◽  
P. M. Heuer
Keyword(s):  
Hydrogen Fluoride ◽  
High Stress ◽  
High Strength ◽  
Uranium Hexafluoride ◽  
Tensile Tests ◽  
Maraging Steels ◽  
Partial Pressures ◽  
Mechanism Of Failure ◽  
Hydrogen Oxide ◽  
Gaseous Uranium

Abstract An investigation was made of the susceptibility to cracking of two commercial 350 grades of maraging steel. Tensile tests were carried out on samples of the steels at very slow strain rates, and the load at failure was used to assess the susceptibility of the steels to cracking in an environment of gaseous uranium hexafluoride and hydrogen fluoride at 70 C. Good resistance to cracking was observed in dry uranium hexafluoride gas but cracking occurred when hydrogen fluoride was present at partial pressures above about 1 kPa. The failure stress decreased with increasing pressure of hydrogen fluoride. Scanning electron microscopy revealed brittle fracture surfaces in all cases where failure occurred at low stress, while failures at high stress were usually ductile in appearance. In view of the susceptibility of these steels to hydrogen embrittlement, it is suggested that the mechanism of failure in the presence of HF was associated with reaction-produced hydrogen. Oxide coated samples prepared by air aging, did not have significantly better resistance to cracking than vacuum aged Samples in the UF6/HF environment.

scholarly journals Coordination-driven self-assembly of discrete Ru6–Pt6 prismatic cages

2018 ◽  
Vol 14 ◽  
pp. 2242-2249 ◽  
Author(s):  
Aderonke Ajibola Adeyemo ◽  
Partha Sarathi Mukherjee
Keyword(s):  
Mass Spectrometry ◽  
Self Assembly ◽  
Room Temperature ◽  
Geometry Optimization ◽  
Platinum Metal ◽  
Major Product ◽  
Spectroscopic Techniques ◽  
One Pot ◽  
Infrared Studies ◽  
Trigonal Prismatic

The coordination-driven self-assembly of two new Ru6–Pt6 hexanuclear trigonal prismatic cages comprising arene–ruthenium(II) clips (1a(NO 3 ) 2 and 1b(NO 3 ) 2 ) and a tritopic platinum(II) metalloligand 2 has been performed in methanol at room temperature. The [3 + 2] hexanuclear cages 3a and 3b were isolated in good yields and characterized by well-known spectroscopic techniques including multinuclear NMR, mass spectrometry, UV–vis and infrared studies. Geometry optimization revealed the shapes and sizes of these hexanuclear prismatic cages. The combination of ruthenium and platinum metal center in a one-pot self-assembly reaction showcases the construction of aesthetically elegant heterometallic structures in supramolecular chemistry leading to the formation of a single major product.

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