Easy-separable magnetic nanoparticle-supported Pd catalysts: Kinetics, stability and catalyst re-use

TY - JOUR

T1 - Easy-separable magnetic nanoparticle-supported Pd catalysts

T2 - Kinetics, stability and catalyst re-use

AU - Laska, Urszula

AU - Frost, Christopher G.

AU - Price, Gareth J.

AU - Plucinski, Pawel K.

N1 - Funding Information: We acknowledge financial support from EPRSC ( Engineering Functional Materials , EP/C519736/1 ) and thank the Centre for Electron Optical Studies at Bath as well as Prof. S. Weinkauf and Dr. M. Hanzlik at the Technical University of Munich for assistance with HRTEM. We also acknowledge the assistance of the Department of Physics at Bath with XRD and Dr. A. Garcia Prieto at University College, London for SQUID measurements.

PY - 2009/12/10

Y1 - 2009/12/10

N2 - A series of novel palladium-based catalysts supported on magnetic nanoparticles with diameters of 7- 17 nm have been prepared and evaluated in C-C coupling, hydrogenation and amination reactions. One type of catalyst used palladium complexes containing phosphine and/or acetate ligands for applications in Suzuki and Heck reactions. The second type consisted of Pd(0)-functionalised magnetic cores for use in hydrogenation and C-C coupling. Each type was effective for a range of reactions and was easily recoverable from the reaction mixture due to the superparamagnetic behaviour of the support. Detailed rate studies, found to correspond to pseudo-first-order kinetics, were conducted to assist in determining the mechanism of the reactions and showed that, during Heck reactions, Pd leaching is critically dependent on the presence of the aryl halide. The catalysts were found to retain their activity for several cycles although the rate of reaction was markedly reduced on re-use. Crown

AB - A series of novel palladium-based catalysts supported on magnetic nanoparticles with diameters of 7- 17 nm have been prepared and evaluated in C-C coupling, hydrogenation and amination reactions. One type of catalyst used palladium complexes containing phosphine and/or acetate ligands for applications in Suzuki and Heck reactions. The second type consisted of Pd(0)-functionalised magnetic cores for use in hydrogenation and C-C coupling. Each type was effective for a range of reactions and was easily recoverable from the reaction mixture due to the superparamagnetic behaviour of the support. Detailed rate studies, found to correspond to pseudo-first-order kinetics, were conducted to assist in determining the mechanism of the reactions and showed that, during Heck reactions, Pd leaching is critically dependent on the presence of the aryl halide. The catalysts were found to retain their activity for several cycles although the rate of reaction was markedly reduced on re-use. Crown

KW - Catalysis

KW - Catalyst re-use

KW - Heck coupling

KW - Hydrogenation

KW - Kinetics

KW - Magnetic nanoparticles

KW - Palladium

UR - http://www.scopus.com/inward/record.url?scp=77951810567&partnerID=8YFLogxK

U2 - 10.1016/j.jcat.2009.10.001

DO - 10.1016/j.jcat.2009.10.001

M3 - Article

AN - SCOPUS:77951810567

SN - 0021-9517

VL - 268

SP - 318

EP - 328

JO - JOURNAL OF CATALYSIS

JF - JOURNAL OF CATALYSIS

IS - 2

ER -