Experimental Determination and Simulation of the Reactivity Effects and Reaction Rate Sensitivity to Different Ranges of Neutron Energy in Homogeneous Heavy Water Solutions of Thorium

1998 ◽  
Vol 130 (2) ◽  
pp. 165-180
Author(s):  
Yu. E. Titarenko ◽  
O. V. Shvedov ◽  
M. M. Igumnov ◽  
E. I. Karpikhin ◽  
V. F. Batyaev ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Heavy Water ◽  
Neutron Energy ◽  
Reaction Rate ◽  
Rate Sensitivity ◽  
Water Solutions

Growth kinetics of lithium formate crystals in normal and heavy water solutions

1982 ◽  
Vol 60 (1) ◽  
pp. 14-20 ◽  
Author(s):  
J. Szewczyk ◽  
J. Karniewicz ◽  
W. Kolasiński
Keyword(s):  
Heavy Water ◽  
Growth Kinetics ◽  
Water Solutions ◽  
Lithium Formate ◽  
Kinetics Of

Experimental Determination of the Resonance Integral for 237Np in a Heavy Water Solution

1999 ◽  
Vol 131 (1) ◽  
pp. 96-106 ◽  
Author(s):  
Yu. E. Titarenko ◽  
O. V. Shvedov ◽  
M. M. Igumnov ◽  
E. I. Karpikhin ◽  
V. F. Batyaev ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Heavy Water ◽  
Water Solution ◽  
Resonance Integral

The role of catalyst activation in the enantioselective hydrogenation of methyl acetoacetate over silica-supported nickel catalysts

1994 ◽  
Vol 72 (2) ◽  
pp. 372-381 ◽  
Author(s):  
Mark A. Keane
Keyword(s):  
Particle Size ◽  
Metal Particle ◽  
Reaction Rate ◽  
Rate Sensitivity ◽  
Nickel Particle ◽  
Nickel Catalysts ◽  
Catalyst Precursor ◽  
Catalyst Activation ◽  
Nickel Metal ◽  
Methyl Acetoacetate

A range of Ni–SiO2 catalysts have been prepared by homogeneous precipitation–deposition and impregnation techniques and modified with aqueous solutions of R-(+)-tartaric acid (TA) to induce enantioselectivity in the asymmetric hydrogenation of a prochiral β-ketoester (methyl acetoacetate) to a β-hydroxyester ((R)-(−)-methyl 3-hydroxybutyrate). The effects of catalyst precursor preparation, nickel loading, and precalcination on the reduction of the precursor were examined and the nature of the resultant nickel particle size distribution is described. The influence of metal–support interactions on the uptake of TA was investigated and data on the corrosive metal leaching and the consequent changes in metal dispersion are presented. Modification of the catalysts with TA not only induced enantioselectivity, but also increased the turnover frequency by up to 15 times that observed for the unmodified surface. The amount of TA adsorbed and the fractional surface coverage by TA is related to the degree of enantiodifferentiation. The effects of variations in supported nickel metal particle sizes (in the overall range of 1.4–13.6 nm) on the reaction rate and enantioselectivity were examined; while the selectivity was independent of metal particle size, the rate of hydrogenation was found to be structure sensitive and a correlation between reaction rate sensitivity and particle size is presented.

Isotopic solvent effect in hydrogenation on a supported nickel catalyst

1983 ◽  
Vol 48 (9) ◽  
pp. 2609-2613
Author(s):  
Rostislav Kudláček ◽  
Alena Judlová
Keyword(s):  
Reaction Mechanism ◽  
Double Bond ◽  
Organic Compound ◽  
Nickel Catalyst ◽  
Heavy Water ◽  
Maleic Acid ◽  
Reaction Rate ◽  
Supported Nickel Catalyst ◽  
Light Water ◽  
Water Solvent

A supported nickel catalyst, commonly applied in industrial hydrogenation of fatts and oils, was used to study the effect of replacement of the light water solvent, with heavy water, on the addition of hydrogen on a double bond of maleic acid. The effect was investigated of the composition and temperature of the solution, on the reaction rate, as well as, the relation between the reaction rate and the amount of the acid absorbed on the catalyst. Reaction mechanism with respect to the hydrogenated organic compound is proposed.

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