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EXAFS characterization of the adsorption sites of nickel ammine and ethylenediamine complexes on a silica surface

✍ Scribed by L. Bonneviot; O. Clause; M. Che; A. Manceau; H. Dexpert

Book ID: 103935302
Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 771 KB
Volume: 6
Category: Article
ISSN: 0920-5861
DOI: 10.1016/0920-5861(89)85004-7

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✦ Synopsis

The evolution of the first and the second coordination shells of Niz+ ions in a nickel ion exchanged silica is nlanit~~ by EXAFS at the nickel K edge in the early stages of a NilSi catalyst preparation, There is a strong pH and ligand effect on the nature of the adsorbed state of Ni2+ ions. leading to isolated grafted complexes. In all cases, a distance of 3~253.31 A between nickel and 2 silicon ions is consistent with a grafting to a pair of vicinal silanol groups.

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