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Copper(II)- and palladium(II)-modified molecular sieve, a reusable catalyst for the Suzuki–Miyaura-coupling

Paper ID Volume ID Publish Year Pages File Format Full-Text
39649 45830 2014 12 PDF Available
Title
Copper(II)- and palladium(II)-modified molecular sieve, a reusable catalyst for the Suzuki–Miyaura-coupling
Abstract

•Cu-Pd/4AMS catalysts were prepared with impregnation [successive (TSI) and co (CI)].•The catalysts characteristics differed confirming the importance of preparation.•Tests were made in Suzuki coupling, where activity and stability were investigated.•Cu/Pd 1/1 alloy proved to be the reason of activity and stability in the coupling.•TSI was active during six runs, whilst the activity of CI dropped.

Copper-palladium bimetallic catalysts supported on 4 Å molecular sieve were prepared with two step impregnation (TSI) and co-impregnation (CI). These materials were studied to determine the importance of the preparation method, the interaction between the Cu–Pd particles, the activity, selectivity and stability in Suzuki–Miyaura reaction. The key-role of the preparation method in the composition of the metal species on the surface of the support was pointed out with catalyst characterisation methods (ICP, BET, XRD, TEM, EDS and TPR). The relationship between the properties of surface material and the catalytic performance and stability were examined too. The two metals (Cu, Pd) were brought to close interaction on the surface of the support. A correlation between these interactions and improvement of stability were found and proven with surface analysis methods. We found that a Cu–Pd alloy with atom ratio 1:1 is responsible for the catalytic activity. Our catalyst TSI was active and selective during six catalytic cycles in Suzuki coupling, whilst the activity of the catalyst prepared with CI dropped after the sixth use. This loss was due to the absence of Cu–Pd 1:1 alloy and the growth of the particle size.

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Keywords
Heterogeneous catalysis; Cu-Pd bimetallic catalysis; Suzuki reaction; Recycling; Stability
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Copper(II)- and palladium(II)-modified molecular sieve, a reusable catalyst for the Suzuki–Miyaura-coupling
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 484, 22 August 2014, Pages 39–50
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us