On the Generation of Hot-Spots by Microwave Electric and Magnetic Fields and Their Impact on a Microwave-Assisted Heterogeneous Reaction in the Presence of Metallic Pd Nanoparticles on an Activated Ca

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• 作者：Satoshi Horikoshi ; Atsushi Osawa ; Masahiko Abe ; Nick Serpone
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：November 24, 2011
• 年：2011
• 卷：115
• 期：46
• 页码：23030-23035
• 全文大小：906K
• 年卷期：v.115,no.46(November 24, 2011)
• ISSN：1932-7455

文摘

This article examines the generation of hot-spots and their impact in the heterogeneous Suzuki鈥揗iyaura coupling reaction for the synthesis of 4-methylbiphenyl in toluene solvent in the presence of Pd/AC. Hot-spots easily formed on the surface of the activated carbon (AC) catalyst support under high electric field conditions; they were recorded in real time using a high-speed camera. Chemical yields of 4-methylbiphenyl under the microwaves鈥?magnetic field (H-field) were 2-fold greater than those under electric field (E-field) conditions at identical temperatures and reaction times (120 min). Microwave E-field irradiation with a high accuracy device enhanced generation of hot-spots. Excessive formation of hot-spots impacted negatively on this coupling reaction.