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  On the nature of the 'heterogeneous' catalyst: Nickel-on- charcoal

Lipshutz, B. H., Tasler, S., Chrisman, W., Spliethoff, B., & Tesche, B. (2002). On the nature of the 'heterogeneous' catalyst: Nickel-on- charcoal. Journal of Organic Chemistry, 68(4), 1177-1189. doi:10.1021/jo020296m.

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Lipshutz, B. H.1, Author
Tasler, S.1, Author
Chrisman, W.1, Author
Spliethoff, B.2, Author           
Tesche, B.3, Author           
Affiliations:
1Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara,; CA 93106 USA;, ou_persistent22              
2Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445625              
3Service Department Tesche (EM), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445631              

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 Abstract: Results from aromatic aminations and Kumada couplings, together with spectroscopic analyses (TEM, EDX, ICP-AES, React-IR), reveal that catalysis using nickel-on-charcoal (Ni/C) is most likely of a homogeneous rather than heterogeneous nature. In the course of a reaction with Ni/C, nickel bleed from the support was calculated to be as high as 78%. However, the existence of an equilibrium for this homogeneous species between nickel located inside vs outside the pore system of charcoal strongly favors the former, thus leaving only traces of metal detectable in solution. This accounts for virtually complete recovery of nickel on the charcoal following filtration of a reaction mixture and allows for recycling of the catalyst. TEM and EDX data were used to explain different reactivity profiles of Ni/C, which depended upon the method of reduction used to convert Ni(II)/C to Ni(0) as well as the level of nickel loading on the support.

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Language(s): eng - English
 Dates: 2002-02-21
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 19891
DOI: 10.1021/jo020296m
ISI: 000181061700001
 Degree: -

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Title: Journal of Organic Chemistry
  Alternative Title : J. Org. Chem.
Source Genre: Journal
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Pages: - Volume / Issue: 68 (4) Sequence Number: - Start / End Page: 1177 - 1189 Identifier: ISSN: 0022-3263