Hydrogenation of oxygen-containing heterocyclic compounds on group VIII metals

The hydrogenation of a number of oxygen-containing heterocyclic compounds on Pt, Pd, and Rh blacks in the liquid phase at atmospheric pressure was investigated. The results are compared with data on H-D exchange with D₂O and are interpreted from the point of view of the theory of -complex adsorption.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No.10, pp. 1332–1334, October, 1981.     

Hydrogenation of ethylene on gadolinium X, Y and L-type zeolites

It is shown that Gd-zeolites have a catalytic activity towards ethylene hydrogenation at 1 atm. This activity decreases with an increase in the SiO₂/Al₂O₃ ratio from 2.2 to 6.1 and 4.1, i.e. upon going from an X type zeolite to Y and L. For these types of zeolite the activity grows with an increase in Gd³⁺ content from 50 to 80%. Oxygen addition to the reaction mixture stabilizes the catalytic activity of zeolites.

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, qv 1 . , SiO₂/Al₂O₃ 2,2 6,1 4,1, .. X Y L. , 50 80%. .

     

Kinetics of CO hydrogenation on group VIII metals

Kinetics of CO hydrogenation on supported Group VIII metals has been studied. Kinetic equations for CO methanation and Fischer-Tropsch synthesis suggested previously are consistent with the experimental data obtained.

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CO VIII . CO -, , .

     

TPD studies of hydrogen adsorption on group VIII metals

Hydrogen desorption proceeds in several temperature regions and differs by its order of magnitude and activation energy. Differential curves of adsorbed hydrogen distribution with respect to the desorption activation energy, dN/dE (E), show a considerable inhomogeneity of adsorbed atomic species and the energetic homogeneity of molecular species.

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. dN/dE (E) .

     

Hydrogenolysis of 3-methylpentane over group VIII metals

Determination of the fragmentation factor in a wide conversion range over Group VIII metals and Re indicated that the single character of the hydrogenolysis of 3-methylpentane is an inherent property of the catalyst and is almost independent of the conversion level. Multiple hydrogenolysis occurs in most cases as rapid subsequent terminal splitting.

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-- VIII Re, , 3- . .

     

π-Arene complexes of the group VIII transition metals

Summary Synthetic methods, structural and chemical aspects of Group VIII ⁶-arene complexes have been reviewed. A section on metal vapor syntheses of these -arene complexes -has been included. -Arene complexes of Group VIII metals in all oxidation states (0, +1, +2, +3) are discussed. Particular emphasis on the -arene ligands lability has been made, and the resultant rich chemistry of the complexes outlined, including catalytic properties.     

Hydrogenation of ethylene and propylene over MgO doped with alkali metals

The hydrogenation of ethylene and propylene over MgO doped with alkali metal vapors has been studied. All the catalysts examined are active in hydrogenation at 150 °C at atmospheric pressure. It is proposed that the catalytic activity of the systems investigated is connected with strong one-electron donor surface sites.

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MgO . 150°C . , .

     

The group VIII platinum-group metals and the Periodic Table

The six platinum group metals (pgms: ruthenium, rhodium, palladium, osmium, iridium and platinum) posed a number of problems for 19th-century chemists, including Mendeleev, for their Periodic classification. This account discusses the discovery of the pgms, the determination of their atomic weights and their classification.     

Surface forms of unsaturated hydrocarbons and their transformations on group VIII metals

IR-spectroscopic and kinetic studies of the surface forms of unsaturated hydrocarbons and their catalytic transformations on group VIII metals have been carried out. Data on the nature and properties of surface compounds in hydrogenation and hydrocracking reactions have been obtained, yielding the sequence of selectivities in these processes.

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- VIII . , .