title: Catalytic hydrogenation of polycyclic aromatic hydrocarbons over palladium/gamma-Al2O3 under mild conditions.
abstract: As a prelude to the optimization of a continuous decontamination system, catalytic hydrogenations of selected tri-, tetra- and penta-cyclic aromatic hydrocarbon compounds over commercial alumina supported palladium were investigated under mild conditions ( approximately 90 degrees C/0.42 MPa H2) and interpreted in the light of reports from the literature. Acenaphthylene, acenaphthene, anthracene, phenanthrene, chrysene and benzo[alpha]pyrene were hydrogenated, virtually completely, to saturated polycyclic hydrocarbon compounds with no appreciable evidence of carbon-carbon bond rearrangement during equilibration. With comparable operating conditions, triphenylene was only partially hydrogenated; the central ring remained unsaturated. The effects of reaction temperature, time of equilibration and supporting gases on hydrogenation were evaluated. Whereas near-critical CO2 had no perceptible influence on rate/course of the reaction, nitrogen decreased the reaction rate somewhat.
authors.affiliation: Department of Food Science and Agricultural Chemistry, Macdonald Campus of McGill University, 21,111 Lakeshore Road, Ste-Anne-de-Bellevue, Qué., Canada H9X 3V9.
authors.forename: Tao
authors.initials: T
authors.lastname: Yuan
authors.forename: William D
authors.initials: WD
authors.lastname: Marshall
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D002245:Carbon Dioxide; D002384:Catalysis; D006865:Hydrogenation; D007220:Industrial Waste / Q000517:prevention & control*; D009584:Nitrogen; D010165:Palladium / Q000737:chemistry*; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry*; D011312:Pressure; D013696:Temperature
chemical_list: D007220:Industrial Waste; D011084:Polycyclic Aromatic Hydrocarbons; D002245:Carbon Dioxide; D010165:Palladium; D000537:Aluminum Oxide; D009584:Nitrogen