Journal
JOURNAL OF CATALYSIS
Volume 352, Issue -, Pages 59-66Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2017.04.034
Keywords
Heterogeneous catalysis; Facet 111 oriented Au nanoplatelets; Graphene supported Pd/G and Pt/G; Suzuki-Miyaura couplings; Poisoning effect of halides
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Funding
- University Grants Commission (UGC), New Delhi
- Department of Science and Technology, India [SB/FT/CS-166/2013]
- Generalidad Valenciana
- Spanish Ministry of Economy and Competitiveness [CTQ-2012-32315]
- Spanish Ministry of Economy and Competitiveness (Severo Ochoa)
- Generalidad Valenciana [Prometeo 2012-014]
- European Community [228862]
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Facet 111 oriented Au nanoplatelets (20-40 nm wide, 3-4 nm height) grafted on graphene ((Au) over bar /fl-G) are about three orders of magnitude more efficient than Pd nanoparticles supported on graphene to promote Suzuki-Miyaura coupling. In contrast to Pd catalysis, it is shown here that the product yields in Suzuki-Miyaura coupling catalyzed by Au nanoparticles follow the order chlorobenzene > bromobenzene > iodobenzene. Kinetic studies show that this reactivity order is the result of the poisoning effect of halides for Au that is much higher for I- than Br- and much higher than for Cl-, due to adsorption. This strong iodide adsorption leading to Au catalyst deactivation was predicted by DFT calculations of Au clusters. (Au) over bar /fl-G are about one order of magnitude more efficient than small Au nanoparticles (4-6 nm) obtained by the polyol method supported on graphene. Our results can have impact in organic synthesis, showing the advantage of (Au) over bar /fl-G as catalyst for Suzuki-Miyaura couplings. (C) 2017 Elsevier Inc. All rights reserved.
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