Chinese Journal of Catalysis ›› 2025, Vol. 71: 297-307.DOI: 10.1016/S1872-2067(24)60262-7

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Identifying a bi-molecular synergetic adsorption mechanism for catalytic transformation of ethanol/acetaldehyde into 1,3-butadiene

Xianquan Lia,b,1, Jifeng Panga,1, Yujia Zhaoa,b, Lin Lia, Wenguang Yuc, Feifei Xuc, Yang Sua, Xiaofeng Yanga, Wenhao Luoa,d, Mingyuan Zhenga,c,*()   

  1. aCAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
    bUniversity of Chinese Academy of Sciences, Beijing 100049, China
    cDalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
    dCollege of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, Inner Mongolia, China
  • Received:2024-11-05 Accepted:2025-01-20 Online:2025-04-18 Published:2025-04-13
  • Contact: * E-mail: myzheng@dicp.ac.cn (M. Zheng).
  • About author:

    1Contributed to this work equally.

  • Supported by:
    National Science Foundation of China(22378383);NSFC Center for Single-Atom Catalysis(22388102);Strategic Priority Research Program of the Chinese Academy of Sciences(XDA 21060200)

Abstract:

The catalytic synthesis of 1,3-butadiene (1,3-BD) from bio-based ethanol offers an alternative and sustainable process beyond petroleum. However, the intrinsic active sites and corresponding mechanism of 1,3-BD formation have not been fully elucidated yet. By correlating systematic characterization results with catalytic performance, the open Zr species, i.e., Zr(OH)(OSi)3 moieties, were identified as the active site over the Zr/MFI-BM catalysts for the catalytic transformation of ethanol-acetaldehyde into 1,3-BD. In conjunction with controlled experiments and theory calculations, ethanol and acetaldehyde are proposed to synergistically co-adsorb on the Zr(OH)(OSi)3 species in a bi-molecular mode, which assists the acetaldehyde condensation and accelerates the critical Meerwein-Ponndorf-Verley-Oppenauer reduction, and accordingly promotes 1,3-BD formation. These findings will stimulate the search towards new metal-zeolite combinations for efficient production of value-added 1,3-BD via biomass-derived ethanol and beyond.

Key words: 1,3-Butadiene, Bi-molecular, Co-adsorption-mechanism, Reaction mechanism, Ethanol conversion