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Silica‐Enveloped 2D‐Sheet‐to‐Nanocrystals Conversion for Resilient Catalytic Dry Reforming of Methane
Author(s) -
Jang Sun Woo,
Dutta Soumen,
Kumar Amit,
Kim Soo Min,
You YoungWoo,
Lee In Su
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202102851
Subject(s) - materials science , chemical engineering , methane , carbon dioxide reforming , catalysis , nanocrystal , thermal stability , coke , nanotechnology , syngas , metallurgy , chemistry , organic chemistry , engineering
Here, lamellar confinement strategy is introduced for “sheet‐to‐nanocrystals (NCs)” conversion within a 2D‐SiO 2 envelope, which constructs a catalytic nanocartridge holding a platoon of isolated and in‐plane‐aligned ultrasmall Ni‐NCs, performing as a robust and coking‐resistant catalytic system for dry reforming of methane. Overcoming the problem of unavoidable bulk crystal growth from multiple sheets‐stack or sheet‐on‐open‐support, silica bilayer‐encasing tightly clamps the atomic‐thin Ni(OH) 2 ‐nanosheet during thermal conversion and further hinders the migratory fusion of the resultant Ni‐NCs. Upon heating‐cooling cycle, the flapping silica envelope clutches the Ni‐NCs like “eggs in a carton,” subsequently, ensuring their thermal stability. Owing to the unique 2D‐enveloped rigid architecture, Ni‐NCs can circumvent sintering and coke deposition while tolerating the high temperatures (>700 °C) for long operation (>100 h), affording high conversions to syngas.