Influence of heat pretreatments of rhodium wire on its activity and selectivity in the hydrogenolysis of propane

1. High temperature annealing of rhodium catalyst wire followed by rapid cooling, increases the reaction rate of the hydrogenolysis of propane and the selectivity for CH4, in comparison to slow cooling, which in turn increases the selectivity for C2H6. 2. Annealing and cooling in hydrogen increases the activity of the catalyst at 573 K by 1.6 times more than annealing the catalyst in an inert gas. © 1988 Plenum Publishing Corporation

Hydrogenolysis of propane on a palladium-ruthenium alloy membrane catalyst

1. The rate of hydrogenolysis of propane and the selectivity for methane in delivery of hydrogen through a Pd-Ru alloy membrane catalyst is lower than in conducting the reaction in conditions of combined delivery of hydrogen and propane. 2. In the 433-533 K temperature region corresponding to the coexistence of the α and β phases of palladium hydride, the rate of hydrogenolysis of propane does not increase with an increase in the temperature. © 1988 Plenum Publishing Corporation

Hydrogenolysis of propane on a palladium-ruthenium alloy membrane catalyst

1. The rate of hydrogenolysis of propane and the selectivity for methane in delivery of hydrogen through a Pd-Ru alloy membrane catalyst is lower than in conducting the reaction in conditions of combined delivery of hydrogen and propane. 2. In the 433-533 K temperature region corresponding to the coexistence of the α and β phases of palladium hydride, the rate of hydrogenolysis of propane does not increase with an increase in the temperature. © 1988 Plenum Publishing Corporation

Influence of heat pretreatments of rhodium wire on its activity and selectivity in the hydrogenolysis of propane

1. High temperature annealing of rhodium catalyst wire followed by rapid cooling, increases the reaction rate of the hydrogenolysis of propane and the selectivity for CH4, in comparison to slow cooling, which in turn increases the selectivity for C2H6. 2. Annealing and cooling in hydrogen increases the activity of the catalyst at 573 K by 1.6 times more than annealing the catalyst in an inert gas. © 1988 Plenum Publishing Corporation

Changes in the catalytic activity and hydrogen permeability of a palladium-ruthenium alloy membrane catalyst under the influence of reagents

1. In the course of catalytic hydrogenation reactions of cyclopentadiene, cyclooctadiene, and isoprene; and in the catalytic hydrogenolysis of propane, all of which proceed at 373-573 K, a.catalytic etching of a palladium-ruthenium membrane catalyst is taking place; it is determined by the nature of the reagents. 2. An oxidative-reductive treatment changes the surface structure, the catalytic activity, and the hydrogen permeability to a much lesser degree than when such a treatment is alternated with actual catalytic reactions. 3. A heat treatment followed by a subsequent rapid cooling from temperatures above the recrystallization temperature, increases significantly the activity of a palladium-ruthenium membrane catalyst in the hydrogenolysis of propane. © 1988 Plenum Publishing Corporation

Changes in the catalytic activity and hydrogen permeability of a palladium-ruthenium alloy membrane catalyst under the influence of reagents

1. In the course of catalytic hydrogenation reactions of cyclopentadiene, cyclooctadiene, and isoprene; and in the catalytic hydrogenolysis of propane, all of which proceed at 373-573 K, a.catalytic etching of a palladium-ruthenium membrane catalyst is taking place; it is determined by the nature of the reagents. 2. An oxidative-reductive treatment changes the surface structure, the catalytic activity, and the hydrogen permeability to a much lesser degree than when such a treatment is alternated with actual catalytic reactions. 3. A heat treatment followed by a subsequent rapid cooling from temperatures above the recrystallization temperature, increases significantly the activity of a palladium-ruthenium membrane catalyst in the hydrogenolysis of propane. © 1988 Plenum Publishing Corporation

THE EFFECT OF EXERCISE ON DIVERGENT THINKING IN SECONDARY SCHOOL STUDENTS

This paper proposes a study of the effect of exercise on divergent thinking in secondary school students. The work is in the nature of a preliminary study of the problem, since it was carried out with a small number of high school students. It was important for us to conduct this study in order to ensure the reliability of the method used. Based on this test work, our research group will do a similar work with a more expanded number of private traders and experimental schools in general