PMID- 18049773
OWN - NLM
STAT- MEDLINE
DCOM- 20080226
LR  - 20131121
IS  - 1464-0325 (Print)
IS  - 1464-0325 (Linking)
VI  - 9
IP  - 12
DP  - 2007 Dec
TI  - Catalytic hydrogenation of polyaromatic hydrocarbon (PAH) compounds in 
      supercritical carbon dioxide over supported palladium.
PG  - 1344-51
AB  - 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) H(2)/CO(2)] stream and transferred to a flow 
      through mini-reactor (capacity ca. 1 g) that was maintained at 90 degrees 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 
      gamma-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 
      gamma-alumina were more efficient than a commercial Pd(0) (5% w/w) on 
      gamma-Al(2)O(3) 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 (scCO(2)) 
      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 Fe(0) formulations.
FAU - Yuan, Tao
AU  - Yuan T
AD  - Department of Food Science and Agricultural Chemistry, Macdonald Campus of McGill 
      University, 21,111 Lakeshore Road, Ste-Anne-de-Bellevue, QC, CanadaH9X 3V9.
FAU - Marshall, William D
AU  - Marshall WD
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20071023
PL  - England
TA  - J Environ Monit
JT  - Journal of environmental monitoring : JEM
JID - 100968688
RN  - 0 (Phenanthrenes)
RN  - 142M471B3J (Carbon Dioxide)
RN  - 3417WMA06D (Benzo(a)pyrene)
RN  - 448J8E5BST (phenanthrene)
RN  - 5TWQ1V240M (Palladium)
RN  - 9002-88-4 (Polyethylene)
RN  - LMI26O6933 (Aluminum Oxide)
SB  - IM
MH  - Aluminum Oxide/*chemistry
MH  - Benzo(a)pyrene/*chemistry
MH  - Carbon Dioxide/*chemistry
MH  - Catalysis
MH  - Hydrogenation
MH  - Palladium/*chemistry
MH  - Phenanthrenes/*chemistry
MH  - Polyethylene/chemistry
EDAT- 2007/12/01 09:00
MHDA- 2008/02/27 09:00
CRDT- 2007/12/01 09:00
PHST- 2007/12/01 09:00 [pubmed]
PHST- 2008/02/27 09:00 [medline]
PHST- 2007/12/01 09:00 [entrez]
AID - 10.1039/b715318j [doi]
PST - ppublish
SO  - J Environ Monit. 2007 Dec;9(12):1344-51. doi: 10.1039/b715318j. Epub 2007 Oct 23.