Brønsted/Lewis Acid Synergy in Methanol-to-Aromatics Conversion on Ga-Modified ZSM-5 Zeolites, As Studied by Solid-State NMR Spectroscopy
- Pan Gao ,
- Qiang Wang ,
- Jun Xu
, - Guodong Qi ,
- Chao Wang ,
- Xue Zhou ,
- Xingling Zhao ,
- Ningdong Feng ,
- Xiaolong Liu, and
- Feng Deng
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† State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People’s Republic of China
‡ University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
*E-mail: [email protected] (J. Xu).
*E-mail: [email protected] (F. Deng).
Abstract
1H–71Ga internuclear spatial proximity/interaction between Brønsted acid site (BAS) and cationic Ga species (Lewis acid sites) in Ga-modified ZSM-5 zeolites, which leads to a synergic effect in the methanol-to-aromatics (MTA) conversion, was identified with solid-state NMR spectroscopy. The internuclear distance between BAS and Ga species was measured, which is similar to that of a neighboring BAS pair located in the six-membered rings of ZSM-5. The Brønsted acidity of the Ga-modified zeolite was considerably enhanced due to the synergic effect, and the synergic active sites were quantified by 1H–71Ga double-resonance solid-state NMR, which shows a correlation with the aromatics selectivity in the MTA reaction.
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