Amine groups functionalized gel-type resin supported Pd catalysts: Physicochemical and catalytic properties in hydrogenation of alkynes
Amine groups—functionalized gel-type resin (FCN) supported Pd catalysts exhibit attractive performance in hydrogenation of alkynes reagents, 2-butyne-1,4-diol and phenylacetylene. The selectivity to desired alkenes products attained ca. 94% at almost complete conversion of alkynes. This performance...
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Published in | Journal of molecular catalysis. A, Chemical Vol. 300; no. 1; pp. 8 - 18 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
02.03.2009
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Amine groups—functionalized gel-type resin (FCN) supported Pd catalysts exhibit attractive performance in hydrogenation of alkynes reagents, 2-butyne-1,4-diol and phenylacetylene. The selectivity to desired alkenes products attained ca. 94% at almost complete conversion of alkynes. This performance is unchanged under the recycling use of catalysts.
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Palladium catalysts (0.125–0.5
wt.% Pd) supported by amine groups—functionalized gel-type resin (FCN) were studied in the hydrogenation of alkynes reagents, 2-butyne-1,4-diol and phenylacetylene. The catalysts were prepared by two routes. The first, “OAc” is based on the immobilization of Pd-precursor in the pre-swollen resin from THF solution of Pd(OAc)
2, followed by chemical reduction of the Pd-centers. This method produces Pd particles of size in nano-scale. The second procedure, “aq” implies the deposition of Pd-species on dry resin beads using aqueous solution of PdCl
2. Reduction of these Pd-species gives relatively large Pd particles, dominating are 30–50
nm in size. The SEM studies performed over the cross-section of catalysts grains showed location of Pd in outer shell of polymer beads in both “OAc” and “aq” catalysts; however, thinner layer of Pd appears in “aq” series catalysts. In the presence of all catalysts, prepared by “OAc” and “aq” methods the selectivity towards alkenes is high, above 90%. The catalysts of “aq’ series are much more active and more selective than “OAc” analogues giving selectivity to alkene ca. 94% at almost complete conversion of alkynes. Moreover, catalytic performance of “aq’ series catalyst is unchanged under recycling use. The catalyst was recovered and reused 4 times, maintaining its catalytic efficiency. |
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ISSN: | 1381-1169 1873-314X |
DOI: | 10.1016/j.molcata.2008.10.035 |