Investigating the effect of metal nuclearity on activity for ethylene hydrogenation by metal-organic-framework-supported oxy-Ni(II) catalysts
Journal Article
·
· Journal of Catalysis
- Northwestern Univ., Evanston, IL (United States)
- Univ. of Chicago, IL (United States)
- Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
Metal-organic frameworks (MOFs), thanks to their well-defined coordination sites, are promising for studying catalytically active structures. Here, to understand the effect of metal nuclearity in MOF-supported catalysts, we adjusted the nuclearity of oxy-Ni(II) supported on the zirconia-like nodes of MOF NU-1000 by modulating the Ni loading, where the organic linkers served to prevent node-to-node migration of grafted nickel ions. At the single-node level, we grafted auxiliary structural linkers, naphthalene dicarboxylate, to reduce the number of binding/grafting sites. We found higher catalytic rates at higher Ni loading for ethylene hydrogenation on a per-nickel-ion basis, despite the similar chemical environment of Ni(II) at different loadings; catalysts consisting mainly of pairs of nickel ions were more reactive than those of single nickel ions. These observations illustrate the need for at least two proximal nickel ions for effective catalysis – presumably one for hydrogen binding and heterolytic splitting and one for ethylene binding and activation.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Northwestern University; National Science Foundation (NSF)
- Grant/Contract Number:
- AC02-06CH11357; SC0012702; FG02-03ER15457; SC0001329
- OSTI ID:
- 1909339
- Alternate ID(s):
- OSTI ID: 1855428
OSTI ID: 1856400
OSTI ID: 2482301
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Vol. 407; ISSN 0021-9517
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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