NDLI: Catalytic hydrogenation of polyaromatic hydrocarbon (PAH) compounds in supercritical carbon dioxide over supported palladium

Content Provider	Royal Society of Chemistry (RSC)
Author	Marshall, William D. Yuan, Tao
Copyright Year	2007
Abstract	A series of supported palladium catalysts were evaluated for their ability to mediate the complete hydrogenation of polycyclic aromatic hydrocarbon (PAH) compounds. Benzo[a]pyrene (B[a]P) or phenanthrene (Phe) in hexane was merged with a hydrogen–carbon dioxide [5% (w/w) H2/CO2] stream and transferred to a flow through mini-reactor (capacity ca. 1 g) that was maintained at 90 °C under a back-pressure of 20.68 MPa. Effluent from the reactor trapped in hexane was monitored/quantified by gas chromatography–mass spectrometry. Catalyst formulations supported on iron powder, high density polyethylene (HDPE) or γ-alumina were prepared and compared in terms of hydrogenation activity as measured by the quantity of substrate per unit time that could be perhydrogenated to toxicologically innocuous products. Both of the Pd preparations supported on γ-alumina were more efficient than a commercial Pd0 (5% w/w) on γ-Al2O3 formulation or preparations supported on HDPE or the iron powder. Bimetallic mixtures with Pd increased the hydrogenation activity when co-deposited with Cu or Ni but not with Ag or Co. However, increases in hydrogenation activity by increasing the loading of Pd (or bimetallic mixture) on this surface were limited. Despite using supercritical carbon dioxide (scCO2) to swell the surfaces of the polymer, the deposition of nanoparticles within the polyethylene formulation was appreciably less active than either the oxidic or the Fe0 formulations.
Starting Page	1344
Ending Page	1351
Page Count	8
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	9
Issue Number	12
Journal	Journal of Environmental Monitoring
DOI	10.1039/b715318j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Cu Hydrogenation Polycyclic aromatic hydrocarbon Pyrene Phenanthrene Hexane Gas chromatography\u2013mass spectrometry Polyethylene Supercritical carbon dioxide Polymer
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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