Abstract: A process is presented which is useful for the selective hydrogenation of polyunsaturated organic compounds. The resultant product of such a reaction produces the monoolefinic equivalents of the hydrogenated polyunsaturated organic compounds. The catalyst used in this selective hydrogenation process comprises nickel and sulfur deposited on the surface of an alumina support. The preferred catalyst does not contain halogens, noble metals, alkaline earth metals, or alkali metals and is characterized by having only a very low percentage of the total pore volume being provided by pores having an average pore diameter less than 150 angstroms. The great majority of the pore volume is present in the form of macropores having diameters of 500 to 1500 angstroms.

Abstract: Process for the selective hydrogenation of diolefinic compounds to monoolefinic compounds employing catalyst consisting essentially of elemental nickel on an inorganic support in the presence of hydrogen and at least one nitrogen-containing compound is disclosed. Selective hydrogenation of the less substituted of the two carbon-carbon double bonds of the diolefinic compound is achieved while isomerization of the more highly substituted, non-hydrogenated double bond, is minimized.

Abstract: A method for hydrogenating olefins and alkynes is provided wherein the unsaturated hydrocarbon is reacted under mild conditions in the presence of a cyclometallated transition metal catalyst which shows greater resistance to degradation caused by oxidation.

Abstract: A method for the partial hydrogenation of conjugated dienes, characterized in that a chain conjugated diene in which the conjugated two double bonds have different numbers of substituents, is hydrogenated at a temperature of not higher than 50.degree. C. in the presence of a catalyst composed essentially of (1) a cobalt compound, (2) an organophosphine compound and (3) an aluminum compound, to obtain a partially hydrogenated product wherein as between said conjugated two double bonds, the one having a greater number of substituents is selectively hydrogenated.

Abstract: A method for producing cycloolefins useful as an intermediate material for lysine, caprolactam, adipic acid, medicines, agricultural chemicals, dyes and the like, which comprises partial hydrogenation of aromatic hydrocarbons with hydrogen gas in the presence of a catalyst composed of barium sulfate which is a carrier as well as ruthenium and at least one metal selected from the group consisting of iron, cobalt, silver and copper supported on said barium sulfate, and water.

Abstract: Iron (II) hexacyanocobaltate and ruthenium (III) hexacyanocobaltate have been found to be useful in the catalytic hydrogenation of organic materials.

Abstract: Organic sulfur compounds containing a carbon-sulfur double bond are used to remove homogeneous catalyst group VIII metals from chemical process streams.

Abstract: Process for hydrogenating unsaturated compounds in the liquid phase in the presence of a soluble catalyst obtained by reacting an organometal derivative or a metal hydride with a synergistic mixture of (a) a compound of zinc, zirconium, manganese, molybdenum, or iron and (b) a nickel or cobalt compound.

Abstract: An improved process is described for the homogeneous hydrogenation of polycyclic aromatic hydrocarbons utilizing anionic Group VIII metal hydride compositions as catalysts which contain phosphorus, arsenic or antimony organoligands. Use of these anionic catalysts allows the process to be conducted under mild conditions of temperature and pressure with high selectivity for the production of partially hydrogenated derivatives of polycyclic aromatic hydrocarbons such as 1,2,3,4-tetrahydronaphthalene, and eliminates the need for the presence of base or carbon monoxide atmosphere in the process.

Abstract: There is disclosed a process for the preparation of cyclopentene which comprises selectively hydrogenating cyclopentadiene in a liquid phase by contacting cyclopentadiene with hydrogen in the presence of a hydrogenation catalyst comprising (1) a soluble nickel compound, (2) an organoaluminum compound or a lithium alkyl compound, and (3) at least one cocatalyst compound selected from the group consisting of H.sub.2 O; NH.sub.3 ; ROH where R is an alkyl or a halogenated alkyl radical containing from 1 to 20 carbon atoms; ##STR1## where R.sub.1, R.sub.2 and R.sub.3 may be hydrogen, or an alkyl radical containing from 1 to 6 carbon atoms; ##STR2## where R.sub.1, R.sub.2 and R.sub.3 may be hydrogen or halogen, or an alkyl radical containing from 1 to 6 carbon atoms; R.sub.1 O R.sub.2 wherein R.sub.1 and R.sub.2 may be the same or different alkyl radicals containing from 1 to 6 carbon atoms; and ##STR3## wherein R.sub.1 may be alkyl or an aromatic radical containing from 1 to 8 carbon atoms and R.sub.

Abstract: There is disclosed an improved process for selectively hydrogenating cyclopentadiene to form cyclopentene in the presence of a catalyst comprising (A) a hydrocarbon-soluble nickel compound such as nickel salts of carboxylic acids or organo nickel compounds, (B) an organo reducing agent such as organoaluminum compounds or lithium alkyl compounds and (C) pyridine, the improvement being that the soluble nickel compound and the pyridine are employed in amounts wherein the mole ratio of aluminum or lithium to the nickel ranges from 7/1 to 11/1 and the mole ratio of the pyridine to the nickel compound ranges from 1/1 to 2.5/1.

Abstract: There is disclosed a process for the preparation of cyclopentene which comprises selectively hydrogenating cyclopentadiene in the liquid phase by contacting cyclopentadiene with hydrogen in the presence of a hydrogenation catalyst comprising a highly dispersed form of nickel in which ammonium hydroxide is employed in the reaction mixture.

Abstract: There is disclosed a process for the preparation of cyclopentene which comprises selectively hydrogenating cyclopentadiene in the liquid phase by contacting cyclopentadiene with hydrogen in the presence of a hydrogenation catalyst comprising a highly dispersed form of nickel in which an alcohol boiling above 99.degree. C. is employed in the reaction mixture.

Abstract: There is disclosed a process for the preparation of cyclopentene which comprises selectively hydrogenating cyclopentadiene in the liquid phase by contacting cyclopentadiene with hydrogen in the presence of a hydrogenation catalyst comprising a highly dispersed form of nickel in which a substantial amount of water and certain surfactants are employed in the reaction mixture.