Probing the temperature of supported platinum nanoparticles under microwave irradiation by in situ and operando XAFS.

Ano, Taishi; Tsubaki, Shuntaro; Liu, Anyue; Matsuhisa, Masayuki; Fujii, Satoshi; Motokura, Ken; Chun, Wang-Jae; Wada, Yuji.

Afiliação

Ano T; School of Materials and Chemical Technology, Tokyo Institute of Technology, E4-3, 2-12-1, Ookayama, Meguro, Tokyo, 152-8552, Japan.
Tsubaki S; School of Materials and Chemical Technology, Tokyo Institute of Technology, E4-3, 2-12-1, Ookayama, Meguro, Tokyo, 152-8552, Japan. shuntaro.tsubaki@gmail.com.
Liu A; PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan. shuntaro.tsubaki@gmail.com.
Matsuhisa M; School of Materials and Chemical Technology, Tokyo Institute of Technology, E4-3, 2-12-1, Ookayama, Meguro, Tokyo, 152-8552, Japan.
Fujii S; School of Materials and Chemical Technology, Tokyo Institute of Technology, E4-3, 2-12-1, Ookayama, Meguro, Tokyo, 152-8552, Japan.
Motokura K; School of Materials and Chemical Technology, Tokyo Institute of Technology, E4-3, 2-12-1, Ookayama, Meguro, Tokyo, 152-8552, Japan.
Chun WJ; Department of Information and Communication Systems Engineering, National Institute of Technology Okinawa College, 905 Henoko, Nago, Okinawa, 905-2192, Japan.
Wada Y; School of Materials and Chemical Technology, Tokyo Institute of Technology, E4-3, 2-12-1, Ookayama, Meguro, Tokyo, 152-8552, Japan.

Commun Chem ; 3(1): 86, 2020 Jul 03.

Article em En | MEDLINE | ID: mdl-36703448

ABSTRACT

Microwave irradiation can cause high local temperatures at supported metal nanoparticles, which can enhance reaction rates. Here we discuss the temperature of platinum nanoparticles on Î³-Al2O3 and SiO2 supports under microwave irradiation using the Debye-Waller factor obtained from in situ extended X-ray absorption fine structure (EXAFS) measurements. Microwave irradiation exhibits considerably smaller Deby-Waller factors than conventional heating, indicating the high local temperature at the nanoparticles. The difference in the average temperatures between the platinum nanoparticles and the bulk under microwaves reaches 26 K and 132 K for Pt/Al2O3 and Pt/SiO2, respectively. As a result, Pt/SiO2 exhibits considerably more reaction acceleration for the catalytic dehydrogenation of 2-propanol under microwave irradiation than Pt/Al2O3. We also find microwaves enhance the reduction of PtOx nanoparticles by using operando X-ray absorption near edge structure (XANES) spectroscopy. The present results indicate that significant local heating of platinum nanoparticles by microwaves is effective for the acceleration of catalytic reactions.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2020 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2020 Tipo de documento: Article