Modulating inherent lewis acidity at the intergrowth interface of mortise-tenon zeolite catalyst

Huiqiu Wang, Boyuan Shen, Xiao Chen (), Hao Xiong, Hongmei Wang, Wenlong Song, Chaojie Cui, Fei Wei () and Weizhong Qian ()
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Huiqiu Wang: Tsinghua University
Boyuan Shen: Tsinghua University
Xiao Chen: Tsinghua University
Hao Xiong: Tsinghua University
Hongmei Wang: Tsinghua University
Wenlong Song: Tsinghua University
Chaojie Cui: Tsinghua University
Fei Wei: Tsinghua University
Weizhong Qian: Tsinghua University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract The acid sites of zeolite are important local structures to control the products in the chemical conversion. However, it remains a great challenge to precisely design the structures of acid sites, since there are still lack the controllable methods to generate and identify them with a high resolution. Here, we use the lattice mismatch of the intergrown zeolite to enrich the inherent Lewis acid sites (LASs) at the interface of a mortise-tenon ZSM-5 catalyst (ZSM-5-MT) with a 90° intergrowth structure. ZSM-5-MT is formed by two perpendicular blocks that are atomically resolved by integrated differential phase contrast scanning transmission electron microscopy (iDPC-STEM). It can be revealed by various methods that novel framework-associated Al (AlFR) LASs are generated in ZSM-5-MT. Combining the iDPC-STEM results with other characterizations, we demonstrate that the partial missing of O atoms at interfaces results in the formation of inherent AlFR LASs in ZSM-5-MT. As a result, the ZSM-5-MT catalyst shows a higher selectivity of propylene and butene than the single-crystal ZSM-5 in the steady conversion of methanol. These results provide an efficient strategy to design the Lewis acidity in zeolite catalysts for tailored functions via interface engineering.

Date: 2022
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DOI: 10.1038/s41467-022-30538-7

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