Pt/CeO2 with residual chloride as reusable soft Lewis acid catalysts: Application to highly efficient isomerization of allylic esters

Qi An Huang, Asahi Haruta, Yuhya Kumamoto, Haruno Murayama, Eiji Yamamoto, Tetsuo Honma, Mitsutaka Okumura, Hiroki Nobutou, Makoto Tokunaga

研究成果: Contribution to journalArticle査読

抄録

Heterogeneous acid and base catalysts play a crucial role in many important chemical processes. Hard Lewis and Brønsted acid catalysts like silica-alumina and zeolites have been widely applied in numerous reactions; however, developing reusable and active soft Lewis acid catalysts remain a challenge. Herein, we demonstrate for the first time that a highly dispersed supported platinum catalyst can act as a heterogeneous soft Lewis acid. High turnover numbers and reusability were observed in the isomerization of allylic esters under solvent-free conditions. Moreover, the as-prepared catalysts are characterized by X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS), revealing that the highly dispersed Pt clusters with Pt–Cl bonds play a key role in the high activity. The residual chloride anion enhances the Lewis acidity of the Pt metal center and thus improves the catalytic activity. Simultaneously, the high catalytic activity of Pt/CeO2 with residual chloride and the soft Lewis acid mechanism are also proved by density functional theory (DFT) calculations based on the model reaction.

本文言語英語
論文番号120333
ジャーナルApplied Catalysis B: Environmental
296
DOI
出版ステータス出版済み - 11 5 2021

All Science Journal Classification (ASJC) codes

  • 触媒
  • 環境科学(全般)
  • プロセス化学およびプロセス工学

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