Related Experiment Video
Updated: Jan 13, 2026
Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5
Published on: August 25, 2016
Molecular Routes of Coke Species on HZSM-5 Zeolite with Atomic-Resolution Structural Identification
Yingjun He1,2, Yi Zheng3,2, Yiyao Chen1,2
1National Engineering Research Center of Lower-Carbon Catalysis Technology, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China.
Researchers decoded elusive coke molecules in HZSM-5 zeolite catalysis using advanced imaging. This breakthrough allows precise identification and understanding of coke structures, crucial for preventing catalyst deactivation.
Area of Science:
- Catalysis
- Materials Science
- Surface Science
Background:
- Catalyst deactivation is a significant challenge in academia and industry.
- Understanding coke deposits is essential for preventing deactivation and optimizing regeneration.
- Previously, the detailed molecular structures of condensed coke species remained largely unexplored.
Purpose of the Study:
- To decode the "structural code" of elusive coke molecules formed during HZSM-5 zeolite-catalyzed methanol-to-hydrocarbon reactions.
- To identify previously less explored, more condensed coke species.
- To unveil the molecular routes of coke formation.
Main Methods:
- Integrated scanning tunneling microscopy (STM) and noncontact atomic force microscopy (nc-AFM) for single-molecule imaging with atomic resolution.
- Employed complementary techniques including gas chromatograph-mass spectrometry (GC-MS) and matrix-assisted laser desorption/ionization Fourier-transform ion cyclotron resonance mass spectrometry (MALDI-FTICR MS).
- Utilized direct imaging in real space to overcome limitations of traditional ensemble averaging methods.
Main Results:
- Achieved direct, single-molecule imaging of coke species with atomic precision.
- Identified coke species with explicit molecular structures across soluble and insoluble ranges.
- Unveiled the molecular formation pathways of these coke species.
Conclusions:
- STM and nc-AFM provide unprecedented atomic-level insight into coke structures, resolving ambiguities from traditional methods.
- This molecular-level understanding is critical for developing strategies to prevent catalyst deactivation.
- The study demonstrates the power of STM and nc-AFM as mechanistic tools in catalysis research.
