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 Carbon Support

被引：143

作者：

Horikoshi, Satoshi ^{[1
]}

Osawa, Atsushi ^{[1
,2
]}

Abe, Masahiko ^{[2
]}

Serpone, Nick ^{[3
]}

机构：

[1] Sophia Univ, Fac Sci & Technol, Dept Mat & Life Sci, Chiyoda Ku, Tokyo 1028554, Japan

[2] Tokyo Univ Sci, Fac Sci, Dept Pure & Appl Chem, Chiba 2788510, Japan

[3] Univ Pavia, Dipartimento Chim, Grp Fotochim, I-27100 Pavia, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 46期

基金：

日本学术振兴会;

关键词：

POWDERS; OXIDE;

D O I：

10.1021/jp2076269

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This article examines the generation of hot-spots and their impact in the heterogeneous Suzuki-Miyaura 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' 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.

引用

页码：23030 / 23035

页数：6

共 14 条

[1]

[Anonymous], 1995, MICROWAVE OPTICAL WA

[2] Activation and Deactivation of a Chemical Transformation by an Electromagnetic Field: Evidence for Specific Microwave Effects in the Formation of Grignard Reagents [J].

Gutmann, Bernhard ;

Schwan, Alexander M. ;

Reichart, Benedikt ;

Gspan, Christian ;

Hofer, Ferdinand ;

Kappe, C. Oliver .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2011, 50 (33) :7636-7640

[3] Nonthermal microwave effects revisited: On the importance of internal temperature monitoring and agitation in microwave chemistry [J].

Herrero, M. Antonia ;

Kremsner, Jennifer M. ;

Kappe, C. Oliver .

JOURNAL OF ORGANIC CHEMISTRY, 2008, 73 (01) :36-47

[4] A novel liquid plasma AOP device integrating microwaves and ultrasounds and its evaluation in defluorinating perfluorooctanoic acid in aqueous media [J].

Horikoshi, Satoshi ;

Sato, Susumu ;

Abe, Masahiko ;

Serpone, Nick .

ULTRASONICS SONOCHEMISTRY, 2011, 18 (05) :938-942

[5] A Novel Dewar-Like Reactor for Maintaining Constant Heat and Enhancing Product Yields during Microwave-Assisted Organic Syntheses [J].

Horikoshi, Satoshi ;

Osawa, Atsushi ;

Suttisawat, Yindee ;

Abe, Masahiko ;

Serpone, Nick .

ORGANIC PROCESS RESEARCH & DEVELOPMENT, 2010, 14 (06) :1461-1464

[6] Characterization of microwave effects on metal-oxide materials: Zinc oxide and titanium dioxide [J].

Horikoshi, Satoshi ;

Matsubara, Akihiro ;

Takayama, Sadatsugu ;

Sato, Motoyasu ;

Sakai, Futoshi ;

Kajitani, Masatsugu ;

Abe, Masahiko ;

Serpone, Nick .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2009, 91 (1-2) :362-367

[7] Instantaneous Formation of Metal and Metal Oxide Nanoparticles on Carbon Nanotubes and Graphene via Solvent-Free Microwave Heating [J].

Lin, Yi ;

Baggett, David W. ;

Kim, Jae-Woo ;

Siochi, Emilie J. ;

Connell, John W. .

ACS APPLIED MATERIALS & INTERFACES, 2011, 3 (05) :1652-1664

[8] Microwave Chemistry in Silicon Carbide Reaction Vials: Separating Thermal from Nonthermal Effects [J].

Obermayer, David ;

Gutmann, Bernhard ;

Kappe, C. Oliver .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2009, 48 (44) :8321-8324

[9] Microwave-assisted synthesis of palladium nanoparticles supported on graphene: A highly active and recyclable catalyst for carbon-carbon cross-coupling reactions [J].

Siamaki, Ali R. ;

Khder, Abd El Rahman S. ;

Abdelsayed, Victor ;

El-Shall, M. Samy ;

Gupton, B. Frank .

JOURNAL OF CATALYSIS, 2011, 279 (01) :1-11

[10] In Situ Observation of Nonequilibrium Local Heating as an Origin of Special Effect of Microwave on Chemistry [J].

Tsukahara, Yasunori ;

Higashi, Ayano ;

Yamauchi, Tomohisa ;

Nakamura, Takashi ;

Yasuda, Makoto ;

Baba, Akio ;

Wada, Yuji .

JOURNAL OF PHYSICAL CHEMISTRY C, 2010, 114 (19) :8965-8970

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