Now showing items 151-160 of 187
Gold-titania interactions: Temperature dependence of surface area and crystallinity of TiO2 and gold dispersion
(Elsevier, 1984-05)
The influence of temperature on the BET surface area, crystallinity, and anatase/rutile phase transformation of blank TiO2 and Au/TiO2 catalysts is studied. Presence of gold delays the recrystallization of anatase and the ...
Alumina-supported triosmium clusters and ensembles: Characterization by high-resolution transmission electron microscopy
(Elsevier, 1983-11)
Structurally defined supported osmium clusters [HOs3(CO)10---O---Al3(CO)12] with the -OH groups of [gamma]-Al2O3. The supported clusters were heated to 200 [deg]C in argon and then reduced in hydrogen at 400 [deg]C, being ...
Isotopic oxygen exchange on supported Ru and Au catalysts
(Elsevier, 1980-06)
The isotopic exchange reaction of molecular oxygen is applied to supported ruthenium and gold catalysts. The results on supported ruthenium are similar to those on RuO2. The exchange reaction seems to be unaffected by ...
Assembly of the gephyrotoxin ring system via a [4+1] approach to 3-pyrrolines
(Elsevier, 1989)
Heating azidodienes 19 at 70[deg]C produced the tricyclic 3-pyrrolines 20 and 21 in one operation. The diastereoselectivity of this process was examined, and found to be controlled by the conformation of the cyclization ...
Thermophysics of metal alkanoates V. Heat capacities and thermodynamic properties of lithium n-butanoate and n-hexanoate
(Elsevier, 1986-07)
The heat capacities of solid lithium n-butanoate and n-hexanoate have been investigated by adiabatic calorimetry between 5 and 350 K. The values at T = 298.15 K of Cp.m/R, {Smo(T) - Smo(0)}/R, {Hmo(T) - Hmo(0)}/R, and ...
The effect of glycosidases on the survival of rat erythrocytes in circulation
(Elsevier, 1988-07-15)
Enzymic removal of sialyl groups from mammalian erythrocytes resulted in their rapid sequestration from circulation subsequent to autologous transfusion. It has been demonstrated by many investigators that the terminal ...
A novel catalytic reactor system for transient response and its use in CO oxidation on Pd/Al2O3
(Elsevier, 1985-08)
In this paper we describe a computer-controlled reactor system capable of imposing any concentration-forcing function on the input. Combination of a monolithic support with a fast-scan Fourier Transform Infrared (FTIR) ...
The thermodynamics of ammonium scheelites II. Heat capacity of deuterated ammonium perrhenate ND4ReO4 from 7.5 to 320 K
(Elsevier, 1986-08)
The heat capacity of the scheelite salt deuterated ammonium perrhenate ND4ReO4 was measured from 7.5 to 320 K without detection of any phase transition. An anomalous peak found between 270 and 280 K resulted from fusion ...
Synthesis of (+/-)-desepoxy-4,5-didehydromethylenomycin A
(Elsevier, 1981)
An efficient and regiochemically controlled synthesis of (+/-)-desepoxy-4,5-didehydromethylenomycin A is reported.
Vaporization and thermodynamic properties of samarium dicarbide and sub-stoichiometric disamarium tricarbide
(Elsevier, 1982-11)
The vaporization reactions of SmC2(s) and Pu2C3-type SmCy(s, 1.36 y SmC2(s) = 2C(s)+Sm(g){2/(2-y)}SmCy(s) = {y/(2-y)}SmC2(s)+Sm(g)The complex reaction for SmCy occurs because the composition of the carbon-rich boundary of ...