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 γ-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 PtO_x 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.

微波辐射会在负载的金属纳米粒子处引起局部高温，从而提高反应速率。在这里，我们使用从原位扩展 X 射线吸收精细结构 (EXAFS) 测量获得的 Debye-Waller 因子讨论微波辐射下γ-Al ₂ O ₃和 SiO ₂载体上铂纳米粒子的温度。微波辐射表现出比传统加热小得多的 Deby-Waller 因子，表明纳米粒子的局部温度较高。_{Pt/Al 2} O ₃和Pt/SiO ₂在微波下铂纳米颗粒和本体之间的平均温度差异达到26 K和132 K， 分别。结果，Pt/SiO ₂在微波辐射下对 2-丙醇的催化脱氢表现出比 Pt/Al ₂ O ₃大得多的反应加速。我们还发现微波通过使用原位 X 射线吸收近边结构 (XANES) 光谱增强了 PtO _{x纳米颗粒的还原。}目前的结果表明，通过微波显着局部加热铂纳米粒子对于加速催化反应是有效的。