2026-08-03 九州大学
マイクロ波電場による急速熱分解と、マイクロ波磁場によるバイオチャーの急速加熱の概念図
＜関連情報＞
- https://www.kyushu-u.ac.jp/ja/researches/view/1542
- https://www.sciencedirect.com/science/article/pii/S1385894726066635?via%3Dihub
マイクロ波照射によって誘発されるニッケルナノ粒子上の局所的な高温形成により、リグノセルロースの超高速触媒熱分解が可能になる Microwave-triggered local high-temperature formation on Ni nanoparticles that enables ultra-fast catalytic pyrolysis of lignocellulose
Shuntaro Tsubaki, Jun Fukushima, Masateru Nishioka, Takeharu Sugiyama, Hisahiro Einaga, Wang-Jae Chun, Ken-ichi Kimijima, Masao Kimurai, Shunsuke Ota, Noriyuki Igura, Yuji Wada, Makoto Yasuda
Chemical Engineering Journal Available online 7 July 2026
DOI:https://doi.org/10.1016/j.cej.2026.179202
Highlights
- Tuned microwaves enabled rapid catalytic pyrolysis of cellulose and bamboo.
- H2 and CO formation were accelerated by tuned microwaves.
- In situ XAFS & XRD revealed local high temperatures at Ni nanoparticles under MWs.
- E- and H-field-controlled heating enabled tuning H2 and CO selectivity.
Abstract
Focused microwave (MW) heating of Ni/SiO2-Al2O3 catalysts achieved “ultra-fast” catalytic pyrolysis of lignocellulose. The MW frequency and the cavity resonator’s quality factor effectively accelerated the pyrolysis of bamboo to produce hydrogen more rapidly than conventional heating. In situ XAFS and in situ XRD provided experimental evidence for the formation of locally heated regions on Ni nanoparticles under MW irradiation. In particular, MW irradiation induced rapid Ni nanoparticle sintering at apparent bulk temperatures of 350–400 °C, whereas comparable sintering was not observed under conventional heating even at 1000 °C. These results support the presence of local high-temperature regions on Ni nanoparticles, although the exact local temperature under reaction conditions remains difficult to quantify. We conclude that MW irradiation accelerates the catalytic reforming of biomass by directly coupling MW energy to Ni nanoparticles and generating local hot spots.