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Silver-Promoted Dehydroaromatization of Ethylene over ZSM-5 Catalysts

Journal Article · · ChemCatChem
The shape selectivity of ZSM-5 (MFI type) catalysts is ideal for the production of C6–C8 aromatics. Developing high-performance zeolite catalysts with improved selectivity to aromatics, particularly from diversified (non-petroleum) feedstocks, has broad commercial appeal. Non-oxidative coupling (NOC) of ethylene was examined over Ag-ZSM-5 catalysts at 400 °C and shows that Ag+ sites promote dehydroaromatization with enhanced selectivity to toluene and xylenes. Metal exchange of H-ZSM-5 results in Ag zoning wherein Ag+ site density is higher on the exterior of ZSM-5 particles. Catalyst performance was characterized with varying Ag loading as well as the use of methane co-feed. Aromatic selectivity is about 60 % on Ag-ZSM-5 compared to 20 % on H-ZSM-5, which is qualitatively consistent with density functional theory (DFT) showing that ethylene forms strong complexes with Ag+ (Lewis acid) sites. DFT calculations also reveal that ethylene activation on H+ (Brønsted acid) sites is more energetically favorable, and likely constitutes the first mechanistic step in ethylene-to-liquids (ETL) reactions. Ag-ZSM-5 is thus identified as an effective catalyst for low-temperature ETL reactions that has the potential to outperform conventional metal-exchanged zeolites.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1543477
Alternate ID(s):
OSTI ID: 1401762
Journal Information:
ChemCatChem, Journal Name: ChemCatChem Journal Issue: 9 Vol. 9; ISSN 1867-3880
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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