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マイクロ爆縮を利用した迅速なPd-N単原子触媒形成

Xiao Chen1, Jingsheng Chen1, Pingxin Wu1

  • 1School of Environment and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, 212100, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)
|December 19, 2025
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まとめ

新規マイクロ爆縮合成反応器（MER）は、超高速でエネルギー効率の高い単原子触媒（SAC）の製造を可能にする。この方法により金属の凝集が防止され、バイオマス変換に高活性で安定したパラジウムSACが得られる。

キーワード:
閉じ込め空間燃焼マイクロ爆縮合成急速熱活性化単原子触媒

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科学分野:

  • 触媒科学
  • 材料合成
  • ナノテクノロジー

背景:

  • 単原子触媒（SAC）のスケーラブルでエネルギー効率の高い合成は、熱活性化中の高いエネルギー消費と金属凝集という課題に直面しています。
  • 従来の.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,ly methods involve a trade-off between achieving atomic dispersion and preventing catalyst deactivation.

研究 の 目的:

  • 高分散で安定な単原子触媒（SAC）を製造するための新規合成方法を開発すること。
  • マイクロ爆縮合成反応器（MER）における原子分散と安定化のメカニズムを調査すること。
  • 合成されたSACの関連触媒用途における性能を評価すること。

主な方法:

  • 空間的に閉じ込められたデフラグレーションのためにマイクロチャネルを備えたマイクロ爆縮合成反応器（MER）を利用しました。
  • 合成メカニズムを解明するために、シンクロトロン特性評価とマルチスケールシミュレーションを採用しました。
  • 合成されたパラジウムSAC（Pd─N4）を5-ヒドロキシメチルフルフラール（HMF）の水素化についてテストしました。

主要な成果:

  • 局所的な超高温（>1500 K）でパラジウムの超高速原子分散（<20 ms）を達成し、バルク温度（<200 °C）を抑制しました。
  • 前駆体昇華、非平衡燃焼波、N配位安定化を含む3段階メカニズムを特定しました。
  • 合成されたPd─N4 SACは、HMF水素化において優れた活性と安定性（>200時間）を示し、ナノ粒子触媒よりも2〜3桁優れていました。
  • MERプロセスはエネルギー消費を98％削減し、スケーラブルで一貫した製造を可能にしました。

結論:

  • MERは、炭素排出量を最小限に抑えたSACの製造のためのスケーラブルでエネルギー効率が高く持続可能なプラットフォームを提供します。
  • 開発された方法は複数の金属に適用可能であり、高度な触媒製造のための汎用的なアプローチを確立します。
  • 合成されたPd─N4 SACは、その優れた触媒性能により、バイオマス変換用途で大きな可能性を示しています。