Strong metal-support interactions of Co-based catalysts facilitated by dopamine for highly efficient ammonia synthesis: in situ XPS and XAFS spectroscopy coupled with TPD studies

We report a new strategy for strengthening metal-support interaction and stabilizing Co nanoparticles at high temperature. Through the use of dopamine and removal of carbon layers by thermal N2 treatment, ceria-based Co catalysts that are efficient and highly stable for ammonia synthesis can be obta...

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Bibliographic Details
Published in:Chemical communications (Cambridge, England) England), 2019-01, Vol.55 (4), p.474-477
Main Authors: Wang, Xiuyun, Li, Lingling, Zhang, Tianhua, Lin, Bingyu, Ni, Jun, Au, Chak-Tong, Jiang, Lilong
Format: Article
Language:English
Subjects:
Ammonia
Catalysis
Catalysts
Cerium oxides
Chemical synthesis
Dopamine
Heat treatment
High temperature
Nanoparticles
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Summary:We report a new strategy for strengthening metal-support interaction and stabilizing Co nanoparticles at high temperature. Through the use of dopamine and removal of carbon layers by thermal N2 treatment, ceria-based Co catalysts that are efficient and highly stable for ammonia synthesis can be obtained. The ammonia synthesis rate at 425 °C and 1 MPa is enhanced from 3.81 mmolNH3 gcat-1 h-1 over Co/CeO2 to 19.12 mmolNH3 gcat-1 h-1 over a dopamine-mediated catalyst. The superior catalytic performances of the dopamine-mediated Co/CeO2 catalyst are associated with smaller crystalline size, stronger metal-support interaction and lower N2 activation energy.
ISSN:1359-7345
1364-548X
DOI:10.1039/c8cc07130f