Activity enhancement by the support in the hydrogenation of C=C bonds over polymer-supported palladium catalysts

Chemistry - A European Journal

Volumn 6, Issue 11, 2000, Pages 1980-1986

  Zecca, Marco ^a   Fišera, Roman ^b   Palma, Giancarlo ^a   Lora, Silvano ^c   Hronec, Milan ^b   Králik, Milan ^b  

^a UNIVERSITY OF PADOVA   (Italy)

^b SLOVAK UNIVERSITY OF TECHNOLOGY   (Slovakia)

^c Istituto di Fotochimica e Radiazioni d'Alta Energia   (Italy)

Author keywords

Hydrogenations; Ion exchange resins; Palladium catalysts

Indexed keywords

PALLADIUM; STYRENE DERIVATIVE;

ARTICLE; BINDING SITE; CATALYSIS; CATALYST; HYDROGENATION; HYDROPHILICITY; HYDROPHOBICITY; METAL BINDING; SYNTHESIS;

EID: 0342810001     PISSN: 09476539     EISSN: None     Source Type: Journal    
DOI: 10.1002/1521-3765(20000602)6:11<1980::AID-CHEM1980>3.0.CO;2-Z     Document Type: Article

References (21)

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20. Some intrinsic problems arise when the partition of a species occurs between a liquid and a polymer which swells in contact with the liquid itself. First, not only the overall volume of the polymer phase changes upon swelling, but it also depends on the compositions of the liquid phase, sometimes dramatically, as it is shown also in this paper. This makes difficult to assess the volume of the polymer phase, in which concentrations must be determined. In fact, BEV is not suitable, because it also includes the interparticle volume, which does not belong to the swollen polymer phase. Moreover, it is matter of debate whether the concentration of solutes in the swollen polymer phase must be calculated with respect to its overall volume or to the fraction which is not occupied by the polymer chains, that is in the volume available to solvent molecules. Also in this case, the assessment of this volume in swellable polymers is not an easy task. It has not a fixed value, like in rigid porous solids, but it depends on the swelling properties of the polymer network. The volume fraction occupied by the polymer chains is a (decreasing) function the swelling volume: The larger the latter, the smaller the former.
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