Amine groups functionalized gel-type resin supported Pd catalysts: Physicochemical and catalytic properties in hydrogenation of alkynes

• Published in: Journal of molecular catalysis. A, Chemical Vol. 300; no. 1; pp. 8 - 18
• Main Authors: Drelinkiewicz, A., Stanuch, W., Knapik, A., Ghanem, A., Kosydar, R., Bukowska, A., Bukowski, W.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 02.03.2009; Elsevier
• Subjects: 2-Butyne-1,4-diol; Catalysis; Chemistry; Exact sciences and technology; Functional resin; General and physical chemistry; Hydrogenation; Palladium; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Palladium; Functional resin; 2-Butyne-1,4-diol; Hydrogenation; Diol; Catalytic reaction; Acetylenic compound; Hydrocarbon; Transition metal; Supported catalyst; Heterogeneous catalysis; Amine; Resins; Platinoid; Physicochemical properties; Alkyne
• ISSN: 1381-1169; 1873-314X
• DOI: 10.1016/j.molcata.2008.10.035

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. ▪ 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.